There are a couple of answers out there for this already, but I have not been able to find anything conclusive. This is the jist of what I am trying to do:
EquityInstrument
public class EquityInstrument : INotifyPropertyChanged
{
private string _Symbol;
public string Symbol
{
get
{
return _Symbol;
}
set
{
_Symbol = value;
OnPropertyChanged("Symbol");
}
}
public EquityInstrument(string Symbol)
{
this.Symbol = Symbol;
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string FieldName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(FieldName);
}
}
}
OptionInstrument
public class OptionInstrument : INotifyPropertyChanged;
{
public readonly EquityInstrument UnderlyingInstrument;
private double _StrikePrice;
public double StrikePrice
{
get
{
return _StrikePrice;
}
set
{
_StrikePrice = value;
OnPropertyChanged("StrikePrice");
}
}
private DateTime _Expiration;
public DateTime Expiration;
{
get
{
return _Expiration;
}
set
{
_Expiration = value;
OnPropertyChanged("Expiration");
}
}
public OptionInstrument(string Symbol, double StrikePrice, DateTime Expiration)
{
this.Symbol = Symbol;
this.StrikePrice = StrikePrice;
this.Expiration = Expiration;
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string FieldName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(FieldName);
}
}
}
This code initiates the Option Table...
GridControl OptionGrid = new GridControl();
BindingList<OptionInstrument> BoundList = new BindingList<OptionInstrument>();
public void InitializeDataTable()
{
OptionGrid.DataSource = new BindingSource() { DataSource = BoundList };
BandedGridColumn Column0 = new BandedGridColumn();
Column0.FieldName = "Symbol";
BandedGridColumn Column1 = new BandedGridColumn();
Column1.FieldName = "StrikePrice";
BandedGridColumn Column2 = new BandedGridColumn();
Column2.FieldName = "Expiration";
BandedGridView MainView = (BandedGridView)OptionGrid.MainView;
MainView.Columns.Add(Column0);
MainView.Columns.Add(Column1);
MainView.Columns.Add(Column2);
BoundList.Add(new OptionInstrument("DELL", 12.22, new DateTime(2012, 10, 12));
BoundList.Add(new OptionInstrument("MSFT", 13.23, new DateTime(2012, 09, 16));
BoundList.Add(new OptionInstrument("SPY", 12.23, new DateTime(2012, 07, 18));
}
What do you think? Are there any good design patterns to accomplish this?
Related
I'm using Asp.Net Core Console Application and Entiy Framework Core and Unit of Work repository pattern. When I'm using multi thread function, I get this error:
DbContext instance cannot be used inside OnConfiguring since it is still being configured at this point. This can happen if a second operation is started on this context before a previous operation completed. Any instance members are not guaranteed to be thread safe.
UnitOfwork.cs
public interface IUnitOfWork : IDisposable
{
void Commit();
ApplicationDbContext GetContext();
}
public class UnitOfWork : IUnitOfWork
{
private readonly ApplicationDbContext _applicationDbContext;
public UnitOfWork(ApplicationDbContext applicationDbContext)
{
_applicationDbContext = applicationDbContext;
}
public void Commit()
{
try
{
_applicationDbContext.SaveChanges();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
public ApplicationDbContext GetContext()
{
return _applicationDbContext;
}
public void Dispose()
{
_applicationDbContext.Dispose();
}
}
IRepository.cs
public interface IGenericRepository<T>
where T : class, IEntity
{
List<T> GetAll(Expression<Func<T, bool>> filter = null,
Func<IQueryable<T>, IOrderedEnumerable<T>> orderBy = null,
string includeProperties = "");
T FindSingle(int id);
T FindBy(Expression<Func<T, bool>> predicate, string includeProperties = "");
void Add(T toAdd);
void Update(T toUpdate);
void Delete(int id);
void Delete(T entity);
}
Repository.cs
public class GenericRepository<T> : IGenericRepository<T>
where T : class, IEntity
{
private readonly IUnitOfWork _unitOfWork;
public GenericRepository(IUnitOfWork unitOfWork)
{
_unitOfWork = unitOfWork;
}
public virtual List<T> GetAll(Expression<Func<T, bool>> filter = null,
Func<IQueryable<T>, IOrderedEnumerable<T>> orderBy = null,
string includeProperties = "")
{
IQueryable<T> query = _unitOfWork.GetContext().Set<T>();
if (filter != null)
{
query = query.Where(filter);
}
foreach (string includeProperty in includeProperties.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
{
query = query.Include(includeProperty);
}
if (orderBy != null)
{
return orderBy(query).ToList();
}
return query.ToList();
}
public virtual T FindSingle(int id)
{
return _unitOfWork.GetContext().Set<T>().Find(id);
}
public virtual T FindBy(Expression<Func<T, bool>> predicate, string includeProperties = "")
{
IQueryable<T> query = _unitOfWork.GetContext().Set<T>();
foreach (string includeProperty in includeProperties.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
{
query = query.Include(includeProperty);
}
return query.Where(predicate).FirstOrDefault();
}
public virtual void Add(T toAdd)
{
_unitOfWork.GetContext().Set<T>().Add(toAdd);
}
public virtual void Update(T toUpdate)
{
_unitOfWork.GetContext().Entry(toUpdate).State = EntityState.Modified;
}
public virtual void Delete(int id)
{
T entity = FindSingle(id);
_unitOfWork.GetContext().Set<T>().Remove(entity);
}
public virtual void Delete(T entity)
{
_unitOfWork.GetContext().Set<T>().Remove(entity);
}
}
Business Services;
public interface IUserService
{
void CreateUser(UserEntity userEntity, bool commit = false);
}
public class UserService : IUserService
{
private readonly IGenericRepository<UserEntity> _userRepository;
private readonly IUnitOfWork _unitOfWork;
public UserService(IUnitOfWork unitOfWork, IGenericRepository<UserEntity> userRepository)
{
_unitOfWork = unitOfWork;
_userRepository = userRepository;
}
public void CreateUser(UserEntity userEntity, bool commit = false)
{
try
{
_userRepository.Add(userEntity);
if (commit)
_unitOfWork.Commit();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
Console Main.cs;
class Program
{
public static ServiceProvider ServiceProvider;
static void Main(string[] args)
{
InitializeIoc();
Task.Run(() => { FuncA(); });
Task.Run(() => { FuncB(); });
Console.ReadLine();
}
private static void InitializeIoc()
{
ServiceProvider = new ServiceCollection()
.AddDbContext<ApplicationDbContext>()
.AddTransient<IUnitOfWork, UnitOfWork>()
.AddTransient(typeof(IGenericRepository<>), typeof(GenericRepository<>))
.AddTransient<IUserService, UserService>()
.BuildServiceProvider();
}
private static void FuncA()
{
var userService = ServiceProvider.GetService<IUserService>();
for (int i = 0; i < 100; i++)
{
userService.CreateUser(new UserEntity { FirstName = "FuncA_" + Guid.NewGuid(), LastName = "Last", CreatedDate = DateTime.Now }, false);
}
}
private static void FuncB()
{
var userService = ServiceProvider.GetService<IUserService>();
for (int i = 0; i < 100; i++)
{
userService.CreateUser(new UserEntity { FirstName = "FuncB_" + Guid.NewGuid(), LastName = "Last", CreatedDate = DateTime.Now }, false);
}
}
}
How can i solve this problem?
Thank you for your help.
The problem is that the used AddDbContext registers your ApplicationDbContext with ServiceLifetime.Scoped, but you are not creating scopes hence it effectively works as singleton, thus is shared and accessed concurrently by multiple threads which causes the exception in question (and potentially many other because DbContext is not thread safe).
The solution is to use scopes, e.g. call CreateScope and use returned object ServiceProvider property for resolving services:
private static void FuncA()
{
using (var scope = ServicePropvider.CreateScope())
{
var userService = scope.ServiceProvider.GetService<IUserService>();
// Do something ...
}
}
private static void FuncB()
{
using (var scope = ServicePropvider.CreateScope())
{
var userService = scope.ServiceProvider.GetService<IUserService>();
// Do something ...
}
}
I'm trying to implement pagination for a project that loads a large set of data from the database.
I've done a lot of searching on the internet already to get db-pagination to work, but for some reason I still don't get it working the way I want.
I've followed the example as described in this topic:
JSF, RichFaces, pagination
The data is loaded, so that works; cache also seems to work. However, it seems to still load all the data. The sr.getRows() in the walk-method is always -1, so the call to the database also uses -1 for maxResults. I get all my data, but no pagination.
I don't want to introduce another dependency if I can avoid it.
Some of my data:
BatchDataModel
public abstract class BatchDataModel<T> extends ExtendedDataModel<T> {
private SequenceRange cachedRange;
private Integer cachedRowCount;
private List<T> cachedList;
private Object rowKey;
public abstract List<T> getDataList(int firstRow, int numRows);
public abstract Object getKey(T t);
public abstract int getTotalCount();
#Override
public void walk(FacesContext ctx, DataVisitor dv, Range range, Object argument) {
SequenceRange sr = (SequenceRange) range;
if (cachedList == null || !equalRanges(cachedRange, sr)) {
cachedList = getDataList(sr.getFirstRow(), sr.getRows());
cachedRange = sr;
}
for (T t : cachedList) {
if (getKey(t) == null) {
/*
* the 2nd param is used to build the client id of the table
* row, i.e. mytable:234:inputname, so don't let it be null.
*/
throw new IllegalStateException("found null key");
}
dv.process(ctx, getKey(t), argument);
}
}
/*
* The rowKey is the id from getKey, presumably obtained from
* dv.process(...).
*/
#Override
public void setRowKey(Object rowKey) {
this.rowKey = rowKey;
}
#Override
public Object getRowKey() {
return rowKey;
}
#Override
public boolean isRowAvailable() {
return (getRowData() != null);
}
#Override
public int getRowCount() {
if (cachedRowCount == null) {
cachedRowCount = getTotalCount();
}
return cachedRowCount;
}
#Override
public T getRowData() {
for (T t : cachedList) {
if (getKey(t).equals(this.getRowKey())) {
return t;
}
}
return null;
}
protected static boolean equalRanges(SequenceRange range1, SequenceRange range2) {
if (range1 == null || range2 == null) {
return range1 == null && range2 == null;
} else {
return range1.getFirstRow() == range2.getFirstRow() && range1.getRows() == range2.getRows();
}
}
/*
* get/setRowIndex are used when doing multiple select in an
* extendedDataTable, apparently. Not tested. Actually, the get method is
* used when using iterationStatusVar="it" & #{it.index}.
*/
#Override
public int getRowIndex() {
if (cachedList != null) {
ListIterator<T> it = cachedList.listIterator();
while (it.hasNext()) {
T t = it.next();
if (getKey(t).equals(this.getRowKey())) {
return it.previousIndex() + cachedRange.getFirstRow();
}
}
}
return -1;
}
#Override
public void setRowIndex(int rowIndex) {
int upperBound = cachedRange.getFirstRow() + cachedRange.getRows();
if (rowIndex >= cachedRange.getFirstRow() && rowIndex < upperBound) {
int index = rowIndex % cachedRange.getRows();
T t = cachedList.get(index);
setRowKey(getKey(t));
}
}
#Override
public Object getWrappedData() {
throw new UnsupportedOperationException("Not supported yet.");
}
#Override
public void setWrappedData(Object data) {
throw new UnsupportedOperationException("Not supported yet.");
}
public List<T> getCachedList() {
return cachedList;
}
Bean (part)
private ListState state;
private BatchDataModel<Batch> model;
public BatchDataModel<Batch> getModel(){
return model;
}
public int getCurrentPage() {
return state.getPage();
}
public void setCurrentPage(int page) {
state.setPage(page);
}
public void setBatchService(BatchService batchService) {
this.batchService = batchService;
}
/**
* Initialize the variables, before the page is shown.
*/
#PostConstruct
private void init() {
filter = new Filter();
sorter = new Sorter();
state = getFromSession("batchList", null);
if (state == null) {
state = new ListState();
storeInSession("batchList", state);
}
}
public void loadBatches(boolean search) {
BatchDataModel<Batch> model = new BatchDataModel<Batch>(){
#Override
public List<Batch> getDataList(int firstRow, int numRows) {
try {
List <Batch> test;
test = batchService.selectBatches(userBean.getUser(), firstRow, numRows);
return test;
} catch (NozemException e) {
LOGGER.error(e.getMessage());
sendMessage(e.getMessage(), true);
return null;
}
}
#Override
public Object getKey(Batch batch) {
return batch.getBatchId();
}
#Override
public int getTotalCount() {
try {
return batchService.countBatches(userBean.getUser());
} catch (NozemException e) {
LOGGER.error(e.getMessage());
sendMessage(e.getMessage(), true);
return 0;
}
}
};
}
xhtml (part)
<rich:dataTable id="batchesTable" rows="2"
value="#{batchBean.model}" var="batch" first="#{batchBean.currentPage}"
styleClass="table" rowClasses="odd-row, even-row"
onrowmouseover="this.style.backgroundColor='#88B5F9'"
onrowmouseout="this.style.backgroundColor='#{a4jSkin.rowBackgroundColor}'">
(...)
<f:facet name="footer">
<rich:dataScroller page="#{batchBean.currentPage}" />
</f:facet>
ArrangeableModel is the key. This class needs to be implemented in the BatchDataModel class, together with a method and function. This way the same state is used and the walk-method gets the correct values in SequenceRange.
public abstract class BatchDataModel<T> extends ExtendedDataModel<T> implements Arrangeable {
private ArrangeableState arrangeableState;
public void arrange(FacesContext context, ArrangeableState state) {
arrangeableState = state;
}
protected ArrangeableState getArrangeableState() {
return arrangeableState;
}
}
I try to use the pickList component of Primefaces. My converter does not work properly and I don't know why.
This is my ManagedBean:
#ManagedBean(name = "comMB")
#SessionScoped
public class TeamCompetitionBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private DualListModel<Team> teams;
List<Team> source;
List<Team> source1;
List<Team> target;
#ManagedProperty("#{team}")
private TeamServiceI teamService;
List<String> teamNameList ;
// public TeamCompetitionBean() {
public DualListModel<Team> getTeams() {
// Players
teamNameList = new ArrayList<String>();
source = new ArrayList<Team>();
target = new ArrayList<Team>();
source.addAll(getTeamService().getTeam());
teams = new DualListModel<Team>(source, target);
return teams;
}
public void setTeams(DualListModel<Team> teams) {
this.teams = teams;
}
public void onTransfer(TransferEvent event) {
StringBuilder builder = new StringBuilder();
for (Object item : event.getItems()) {
builder.append(((Team) item).getTeamName()).append("<br />");
}
FacesMessage msg = new FacesMessage();
msg.setSeverity(FacesMessage.SEVERITY_INFO);
msg.setSummary("Items Transferred");
msg.setDetail(builder.toString());
FacesContext.getCurrentInstance().addMessage(null, msg);
}
public TeamServiceI getTeamService() {
return teamService;
}
public void setTeamService(TeamServiceI teamService) {
this.teamService = teamService;
}
public List<Team> getSource() {
return source;
}
public void setSource(List<Team> source) {
this.source = source;
}
public List<Team> getTarget() {
return target;
}
public void setTarget(List<Team> target) {
this.target = target;
}
public void afficher(){
System.out.println(target);
System.out.println(source);
}
}
and this is my entity class that I would like to load in my pickList:
#Entity
#Table(name = "team", catalog = "competition_manager")
public class Team implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer idTeam;
private Stadium stadium;
private League league;
private String teamName;
// getters and setters
#Override
public String toString() {
return teamName.toString();
}
#Override
public boolean equals(Object obj) {
if (!(obj instanceof Team)) {
return false;
}
Team f = (Team) obj;
return (this.idTeam == f.getIdTeam());
}
Now, this is my custom Converter:
#FacesConverter(forClass = Team.class, value = "teamConverter")
public class TeamConverter implements Converter {
Team team;
public Object getAsObject(FacesContext facesContext, UIComponent component,
String value) {
System.out.println("hello object");
if (value == null || value.length() == 0) {
return null;
}
ApplicationContext ctx = FacesContextUtils
.getWebApplicationContext(FacesContext.getCurrentInstance());
TeamBean controller = (TeamBean) ctx.getBean("teamMB");
List<Team> liststagiaire = controller.getTeamList();
for (int i = 0; i < liststagiaire.size(); i++)
{
team = liststagiaire.get(i);
if (team.getIdTeam() == getKey(value)) {
break;
}
}
return team;
}
java.lang.Integer getKey(String value) {
java.lang.Integer key;
key = Integer.valueOf(value);
return key;
}
String getStringKey(java.lang.Integer value) {
StringBuffer sb = new StringBuffer();
sb.append(value);
return sb.toString();
}
public String getAsString(FacesContext facesContext, UIComponent component,
Object object) {
System.out.println("hello string");
if (object == null) {
System.out.println("hello string null");
return null;
}
if (object instanceof Team) {
System.out.println("hello string intance of");
Team o = (Team) object;
String i = getStringKey(o.getIdTeam());
return i;
} else {
System.out.println("hello throw");
throw new IllegalArgumentException("object " + object
+ " is of type " + object.getClass().getName()
+ "; expected type: " + Team.class.getName());
}
}
}
And finally this is my XHTML page:
<p:pickList id="teamPickList" value="#{comMB.teams}" var="team"
itemValue="#{team}" itemLabel="#{team}" converter="teamConverter">
</p:pickList>
Your problem is comming from this line (in your class TeamConverter) :
if (team.getIdTeam() == getKey(value)) {
You can't compare Integer objects like that, because doing like this you are comparing reference. You should replace this line by
if (team.getIdTeam().intValue() == getKey(value).intValue()) {
You have the same problem in your class Team :
return (this.idTeam == f.getIdTeam());
should be replaced by :
return (this.idTeam.intValue() == f.getIdTeam().intValue());
Not related :
You don't need to use getKey and getStringKey, you could replace them simply like this :
getKey(value) // this
Integer.valueOf(value) // by this
and
getStringKey(o.getIdTeam()) // this
o.getIdTeam().toString() // by this
Also you should replace itemLabel="#{team}" by itemLabel="#{team.teamName}" in your view.
I am getting the token from acs as describe in this post Validating a SWT Token REST WCF Service
But i was not able to extract the ACS token.
Could you please help me in that.
Actually the class the extract the acs token "JsonNotifyRequestSecurityTokenResponse.FromJson"
I was not able to get that as the class as the link provided is not working.
I think you posted this question as an answer at my question some hours ago and then deleted it. So i looked up my old project and found the code you need:
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IdentityModel.Policy;
using System.IdentityModel.Tokens;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Text;
using System.Web;
using System.Xml.Linq;
using Thinktecture.IdentityModel.Extensions;
namespace Security {
[DataContract]
public class JsonNotifyRequestSecurityTokenResponse {
[DataMember(Name = "appliesTo", Order = 1)]
public string AppliesTo { get; set; }
[DataMember(Name = "context", Order = 2)]
public string Context { get; set; }
[DataMember(Name = "created", Order = 3)]
public string Created { get; set; }
[DataMember(Name = "expires", Order = 4)]
public string Expires { get; set; }
[DataMember(Name = "securityToken", Order = 5)]
public string SecurityTokenString { get; set; }
[DataMember(Name = "tokenType", Order = 6)]
public string TokenType { get; set; }
public DateTime ValidFrom { get; set; }
public DateTime ValidTo { get; set; }
public GenericXmlSecurityToken SecurityToken { get; set; }
public static JsonNotifyRequestSecurityTokenResponse FromJson(string jsonString) {
JsonNotifyRequestSecurityTokenResponse rstr;
var memoryStream = new MemoryStream(Encoding.Unicode.GetBytes(jsonString));
var serializer = new DataContractJsonSerializer(typeof(JsonNotifyRequestSecurityTokenResponse));
rstr = serializer.ReadObject(memoryStream) as JsonNotifyRequestSecurityTokenResponse;
memoryStream.Close();
ParseValues(rstr);
return rstr;
}
private static void ParseValues(JsonNotifyRequestSecurityTokenResponse rstr) {
rstr.ValidFrom = ulong.Parse(rstr.Created).ToDateTimeFromEpoch();
rstr.ValidTo = ulong.Parse(rstr.Expires).ToDateTimeFromEpoch();
rstr.SecurityTokenString = HttpUtility.HtmlDecode(rstr.SecurityTokenString);
var xml = XElement.Parse(rstr.SecurityTokenString);
string idAttribute = "";
string tokenType = "";
switch (rstr.TokenType) {
case SecurityTokenTypes.Saml11:
idAttribute = "AssertionID";
tokenType = SecurityTokenTypes.Saml11;
break;
case SecurityTokenTypes.Saml2:
idAttribute = "ID";
tokenType = SecurityTokenTypes.Saml2;
break;
case SecurityTokenTypes.SWT:
idAttribute = "Id";
tokenType = SecurityTokenTypes.SWT;
break;
}
if (tokenType == SecurityTokenTypes.Saml11 || tokenType == SecurityTokenTypes.Saml2) {
var tokenId = xml.Attribute(idAttribute);
var xmlElement = xml.ToXmlElement();
SecurityKeyIdentifierClause clause = null;
if (tokenId != null) {
clause = new SamlAssertionKeyIdentifierClause(tokenId.Value);
}
rstr.SecurityToken = new GenericXmlSecurityToken(
xmlElement,
null,
rstr.ValidFrom,
rstr.ValidTo,
clause,
clause,
new ReadOnlyCollection<IAuthorizationPolicy>(new List<IAuthorizationPolicy>()));
}
}
private class SecurityTokenTypes {
public const string Saml2 = "urn:oasis:names:tc:SAML:2.0:assertion";
public const string Saml11 = "urn:oasis:names:tc:SAML:1.0:assertion";
public const string SWT = "http://schemas.xmlsoap.org/ws/2009/11/swt-token-profile-1.0";
}
}
}
You should get the Thinktecture.IdentityModel.Extensions assembly from: http://identitymodel.codeplex.com/
I hope this helps.
EDIT - SWT token handling
I don't know if it helps, but I've found a SWTModule which should handle a SWT token.
public class SWTModule : IHttpModule {
void IHttpModule.Dispose() {
}
void IHttpModule.Init(HttpApplication context) {
context.BeginRequest += new EventHandler(context_BeginRequest);
}
void context_BeginRequest(object sender, EventArgs e) {
//HANDLE SWT TOKEN VALIDATION
// get the authorization header
string headerValue = HttpContext.Current.Request.Headers.Get("Authorization");
// check that a value is there
if (string.IsNullOrEmpty(headerValue)) {
throw new ApplicationException("unauthorized");
}
// check that it starts with 'WRAP'
if (!headerValue.StartsWith("WRAP ")) {
throw new ApplicationException("unauthorized");
}
string[] nameValuePair = headerValue.Substring("WRAP ".Length).Split(new char[] { '=' }, 2);
if (nameValuePair.Length != 2 ||
nameValuePair[0] != "access_token" ||
!nameValuePair[1].StartsWith("\"") ||
!nameValuePair[1].EndsWith("\"")) {
throw new ApplicationException("unauthorized");
}
// trim off the leading and trailing double-quotes
string token = nameValuePair[1].Substring(1, nameValuePair[1].Length - 2);
// create a token validator
TokenValidator validator = new TokenValidator(
this.acsHostName,
this.serviceNamespace,
this.trustedAudience,
this.trustedTokenPolicyKey);
// validate the token
if (!validator.Validate(token)) {
throw new ApplicationException("unauthorized");
}
}
}
And you also need the TokenValidator:
public class TokenValidator {
private string issuerLabel = "Issuer";
private string expiresLabel = "ExpiresOn";
private string audienceLabel = "Audience";
private string hmacSHA256Label = "HMACSHA256";
private string acsHostName;
private string trustedSigningKey;
private string trustedTokenIssuer;
private string trustedAudienceValue;
public TokenValidator(string acsHostName, string serviceNamespace, string trustedAudienceValue, string trustedSigningKey) {
this.trustedSigningKey = trustedSigningKey;
this.trustedTokenIssuer = String.Format("https://{0}.{1}/",
serviceNamespace.ToLowerInvariant(),
acsHostName.ToLowerInvariant());
this.trustedAudienceValue = trustedAudienceValue;
}
public bool Validate(string token) {
if (!this.IsHMACValid(token, Convert.FromBase64String(this.trustedSigningKey))) {
return false;
}
if (this.IsExpired(token)) {
return false;
}
if (!this.IsIssuerTrusted(token)) {
return false;
}
if (!this.IsAudienceTrusted(token)) {
return false;
}
return true;
}
public Dictionary<string, string> GetNameValues(string token) {
if (string.IsNullOrEmpty(token)) {
throw new ArgumentException();
}
return
token
.Split('&')
.Aggregate(
new Dictionary<string, string>(),
(dict, rawNameValue) => {
if (rawNameValue == string.Empty) {
return dict;
}
string[] nameValue = rawNameValue.Split('=');
if (nameValue.Length != 2) {
throw new ArgumentException("Invalid formEncodedstring - contains a name/value pair missing an = character");
}
if (dict.ContainsKey(nameValue[0]) == true) {
throw new ArgumentException("Repeated name/value pair in form");
}
dict.Add(HttpUtility.UrlDecode(nameValue[0]), HttpUtility.UrlDecode(nameValue[1]));
return dict;
});
}
private static ulong GenerateTimeStamp() {
// Default implementation of epoch time
TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
return Convert.ToUInt64(ts.TotalSeconds);
}
private bool IsAudienceTrusted(string token) {
Dictionary<string, string> tokenValues = this.GetNameValues(token);
string audienceValue;
tokenValues.TryGetValue(this.audienceLabel, out audienceValue);
if (!string.IsNullOrEmpty(audienceValue)) {
if (audienceValue.Equals(this.trustedAudienceValue, StringComparison.Ordinal)) {
return true;
}
}
return false;
}
private bool IsIssuerTrusted(string token) {
Dictionary<string, string> tokenValues = this.GetNameValues(token);
string issuerName;
tokenValues.TryGetValue(this.issuerLabel, out issuerName);
if (!string.IsNullOrEmpty(issuerName)) {
if (issuerName.Equals(this.trustedTokenIssuer)) {
return true;
}
}
return false;
}
private bool IsHMACValid(string swt, byte[] sha256HMACKey) {
string[] swtWithSignature = swt.Split(new string[] { "&" + this.hmacSHA256Label + "=" }, StringSplitOptions.None);
if ((swtWithSignature == null) || (swtWithSignature.Length != 2)) {
return false;
}
HMACSHA256 hmac = new HMACSHA256(sha256HMACKey);
byte[] locallyGeneratedSignatureInBytes = hmac.ComputeHash(Encoding.ASCII.GetBytes(swtWithSignature[0]));
string locallyGeneratedSignature = HttpUtility.UrlEncode(Convert.ToBase64String(locallyGeneratedSignatureInBytes));
return locallyGeneratedSignature == swtWithSignature[1];
}
private bool IsExpired(string swt) {
try {
Dictionary<string, string> nameValues = this.GetNameValues(swt);
string expiresOnValue = nameValues[this.expiresLabel];
ulong expiresOn = Convert.ToUInt64(expiresOnValue);
ulong currentTime = Convert.ToUInt64(GenerateTimeStamp());
if (currentTime > expiresOn) {
return true;
}
return false;
} catch (KeyNotFoundException) {
throw new ArgumentException();
}
}
}
My web application is a CRUD web application based on JSF 2.0 / JPA using Java EE 5 and JDK 1.6. Running on Glassfish 3.1. The IDE is Netbeans 7.0. (I do not use EJB, nor CDI).
THE PROBLEM
What I can achieve now is perform CRUD on my entities. Which is fine. For each entity I have:
List.xhtml (LIsting all Datamodel items for that entity in datatable)
Create.xhtml (A form to create a new item)
View.xhtml (a form to view an item)
Edit.xhtml (a form to edit an item)
Structure
entities package: entities.
jpa.controllers package: JPA controllers (Javax persistence..).
jsf package: a managed bean for each entity (session Scoped).
But the main problem is parent-leaf navigation. I want my webapp to do the same thing as the Demo application Agile ScrumToys that comes along shipped with Netbeans 7.0. or the demo webapp from SpringFuse, otherwise :
E.G: When you display a list of WRITERS in a you have the last <h:column> where you put three <h:commandLink /> for editing, viewing and deleting the selected row.
What I intend to do is to add another in the same column that allows me to view a collection of child objects related to that selected row.
Hence, I want to show the list of BOOKS written by a given WRITER.
WRITER 1 ---------- * BOOK (one-to-many) relationship.
When the user clicks on the
<h:commandButton action="#{someManagedBean.showBooksForWriter}" value="#{i18n.listBooks}" /> it forwards him to the /book/List.xhtml (list of the selected WRITEr row should appear). And so on, from the book datatable, from a given row, I click on <h:commandLink action="#{someManagedBean.showReferencesForBook}" value="List of Book References"/> to get the list of references for the given book.
A given hint by #Matt was to use a method in the book managed bean:
public showBooksForWriter(Writer writer) {
// TODO: get the selected writer
// Get the list of books for the selected writer
return "/book/List"; // Outcome
}
And in the view :
<h:datatable value="#{writerController.items}" var="w">
.....
<h:column>
<h:commandButton action="#{bookController.showBooksForWriter(w}" value="Show Books For Writer"/>
</h:column>
....
</h:datatable>
But I could not figure how to (DataModel is driving mad). So if anyone could help! It would be very appreciated!
Below is my code
the WRITER entity:
package entities;
import javax.persistence.*; // other imports
#Entity
#Table(name = "WRITER")
#XmlRootElement
#NamedQueries({
#NamedQuery(name = "Writer.findAll", query = "SELECT w FROM Writer w"),
#NamedQuery(name = "Writer.findByWriterid", query = "SELECT w FROM Writer w WHERE w.writerid = :writerid"),
#NamedQuery(name = "Writer.findByName", query = "SELECT w FROM Writer w WHERE w.name = :name"),
#NamedQuery(name = "Writer.findBySurname", query = "SELECT w FROM Writer w WHERE w.surname = :surname"),
#NamedQuery(name = "Writer.findByMiddlename", query = "SELECT w FROM Writer w WHERE w.middlename = :middlename"),
#NamedQuery(name = "Writer.findByIsRewarded", query = "SELECT w FROM Writer w WHERE w.isRewarded = :isRewarded")})
public class Writer implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Basic(optional = false)
#NotNull
#Column(name = "writerid")
private Integer writerid;
#Size(max = 45)
#Column(name = "name")
private String name;
#Size(max = 45)
#Column(name = "surname")
private String surname;
#Size(max = 45)
#Column(name = "middlename")
private String middlename;
#Column(name = "isRewarded")
private Boolean isRewarded;
#ManyToMany(mappedBy = "writerList")
private List<Topic> topicList;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "writer")
private List<Evaluation> evaluationList;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "writer")
private List<Book> bookList;
public Writer() {
}
public Writer(Integer writerid) {
this.writerid = writerid;
}
public Integer getWriterid() {
return writerid;
}
public void setWriterid(Integer writerid) {
this.writerid = writerid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public String getMiddlename() {
return middlename;
}
public void setMiddlename(String middlename) {
this.middlename = middlename;
}
public Boolean getIsRewarded() {
return isRewarded;
}
public void setIsRewarded(Boolean isRewarded) {
this.isRewarded = isRewarded;
}
#XmlTransient
public List<Topic> getTopicList() {
return topicList;
}
public void setTopicList(List<Topic> topicList) {
this.topicList = topicList;
}
#XmlTransient
public List<Evaluation> getEvaluationList() {
return evaluationList;
}
public void setEvaluationList(List<Evaluation> evaluationList) {
this.evaluationList = evaluationList;
}
#XmlTransient
public List<Book> getBookList() {
return bookList;
}
public void setBookList(List<Book> bookList) {
this.bookList = bookList;
}
#Override
public int hashCode() {
int hash = 0;
hash += (writerid != null ? writerid.hashCode() : 0);
return hash;
}
#Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Writer)) {
return false;
}
Writer other = (Writer) object;
if ((this.writerid == null && other.writerid != null) || (this.writerid != null && !this.writerid.equals(other.writerid))) {
return false;
}
return true;
}
#Override
public String toString() {
return getMiddlename();
}
}
The Writer MANAGED BEAN
package jsf;
import entities.Writer;
import jsf.util.JsfUtil;
import jsf.util.PaginationHelper;
import jpa.controllers.WriterJpaController;
import javax.faces.bean.ManagedBean;
// other imports here
#ManagedBean(name = "writerController")
#SessionScoped
public class WriterController implements Serializable {
#Resource
private UserTransaction utx = null;
#PersistenceUnit(unitName = "writerPU")
private EntityManagerFactory emf = null;
private Writer current;
private DataModel items = null;
private WriterJpaController jpaController = null;
private PaginationHelper pagination;
private int selectedItemIndex;
public WriterController() {
}
public Writer getSelected() {
if (current == null) {
current = new Writer();
selectedItemIndex = -1;
}
return current;
}
private WriterJpaController getJpaController() {
if (jpaController == null) {
jpaController = new WriterJpaController(utx, emf);
}
return jpaController;
}
public PaginationHelper getPagination() {
if (pagination == null) {
pagination = new PaginationHelper(10) {
#Override
public int getItemsCount() {
return getJpaController().getWriterCount();
}
#Override
public DataModel createPageDataModel() {
return new ListDataModel(getJpaController().findWriterEntities(getPageSize(), getPageFirstItem()));
}
};
}
return pagination;
}
public String prepareList() {
recreateModel();
return "List";
}
public String prepareView() {
current = (Writer) getItems().getRowData();
selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
return "View";
}
public String prepareCreate() {
current = new Writer();
selectedItemIndex = -1;
return "Create";
}
public String create() {
try {
getJpaController().create(current);
JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("WriterCreated"));
return prepareCreate();
} catch (Exception e) {
JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
return null;
}
}
public String prepareEdit() {
current = (Writer) getItems().getRowData();
selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
return "Edit";
}
public String update() {
try {
getJpaController().edit(current);
JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("WriterUpdated"));
return "View";
} catch (Exception e) {
JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
return null;
}
}
public String destroy() {
current = (Writer) getItems().getRowData();
selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
performDestroy();
recreateModel();
return "List";
}
public String destroyAndView() {
performDestroy();
recreateModel();
updateCurrentItem();
if (selectedItemIndex >= 0) {
return "View";
} else {
// all items were removed - go back to list
recreateModel();
return "List";
}
}
private void performDestroy() {
try {
getJpaController().destroy(current.getWriterid());
JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("WriterDeleted"));
} catch (Exception e) {
JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
}
}
private void updateCurrentItem() {
int count = getJpaController().getWriterCount();
if (selectedItemIndex >= count) {
// selected index cannot be bigger than number of items:
selectedItemIndex = count - 1;
// go to previous page if last page disappeared:
if (pagination.getPageFirstItem() >= count) {
pagination.previousPage();
}
}
if (selectedItemIndex >= 0) {
current = getJpaController().findWriterEntities(1, selectedItemIndex).get(0);
}
}
public DataModel getItems() {
if (items == null) {
items = getPagination().createPageDataModel();
}
return items;
}
private void recreateModel() {
items = null;
}
public String next() {
getPagination().nextPage();
recreateModel();
return "List";
}
public String previous() {
getPagination().previousPage();
recreateModel();
return "List";
}
public SelectItem[] getItemsAvailableSelectMany() {
return JsfUtil.getSelectItems(getJpaController().findWriterEntities(), false);
}
public SelectItem[] getItemsAvailableSelectOne() {
return JsfUtil.getSelectItems(getJpaController().findWriterEntities(), true);
}
#FacesConverter(forClass = Writer.class)
public static class WriterControllerConverter implements Converter {
public Object getAsObject(FacesContext facesContext, UIComponent component, String value) {
if (value == null || value.length() == 0) {
return null;
}
WriterController controller = (WriterController) facesContext.getApplication().getELResolver().
getValue(facesContext.getELContext(), null, "writerController");
return controller.getJpaController().findWriter(getKey(value));
}
java.lang.Integer getKey(String value) {
java.lang.Integer key;
key = Integer.valueOf(value);
return key;
}
String getStringKey(java.lang.Integer value) {
StringBuffer sb = new StringBuffer();
sb.append(value);
return sb.toString();
}
public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
if (object == null) {
return null;
}
if (object instanceof Writer) {
Writer o = (Writer) object;
return getStringKey(o.getWriterid());
} else {
throw new IllegalArgumentException("object " + object + " is of type " + object.getClass().getName() + "; expected type: " + WriterController.class.getName());
}
}
}
}
JSF Utility Class
package jsf.util;
import javax.faces.application.FacesMessage;
// Other imports here
public class JsfUtil {
public static SelectItem[] getSelectItems(List<?> entities, boolean selectOne) {
int size = selectOne ? entities.size() + 1 : entities.size();
SelectItem[] items = new SelectItem[size];
int i = 0;
if (selectOne) {
items[0] = new SelectItem("", "---");
i++;
}
for (Object x : entities) {
items[i++] = new SelectItem(x, x.toString());
}
return items;
}
public static void addErrorMessage(Exception ex, String defaultMsg) {
String msg = ex.getLocalizedMessage();
if (msg != null && msg.length() > 0) {
addErrorMessage(msg);
} else {
addErrorMessage(defaultMsg);
}
}
public static void addErrorMessages(List<String> messages) {
for (String message : messages) {
addErrorMessage(message);
}
}
public static void addErrorMessage(String msg) {
FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, msg);
FacesContext.getCurrentInstance().addMessage(null, facesMsg);
}
public static void addSuccessMessage(String msg) {
FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_INFO, msg, msg);
FacesContext.getCurrentInstance().addMessage("successInfo", facesMsg);
}
public static String getRequestParameter(String key) {
return FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(key);
}
public static Object getObjectFromRequestParameter(String requestParameterName, Converter converter, UIComponent component) {
String theId = JsfUtil.getRequestParameter(requestParameterName);
return converter.getAsObject(FacesContext.getCurrentInstance(), component, theId);
}
}
JSF Pagination helper
package jsf.util;
import javax.faces.model.DataModel;
public abstract class PaginationHelper {
private int pageSize;
private int page;
public PaginationHelper(int pageSize) {
this.pageSize = pageSize;
}
public abstract int getItemsCount();
public abstract DataModel createPageDataModel();
public int getPageFirstItem() {
return page * pageSize;
}
public int getPageLastItem() {
int i = getPageFirstItem() + pageSize - 1;
int count = getItemsCount() - 1;
if (i > count) {
i = count;
}
if (i < 0) {
i = 0;
}
return i;
}
public boolean isHasNextPage() {
return (page + 1) * pageSize + 1 <= getItemsCount();
}
public void nextPage() {
if (isHasNextPage()) {
page++;
}
}
public boolean isHasPreviousPage() {
return page > 0;
}
public void previousPage() {
if (isHasPreviousPage()) {
page--;
}
}
public int getPageSize() {
return pageSize;
}
} // END of CLASS
The JPA Controller
package jpa.controllers;
import entities.Writer;
// other imports here
public class WriterJpaController implements Serializable {
public WriterJpaController(UserTransaction utx, EntityManagerFactory emf) {
this.utx = utx;
this.emf = emf;
}
private UserTransaction utx = null;
private EntityManagerFactory emf = null;
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void create(Writer writer) throws RollbackFailureException, Exception {
if (writer.getTopicList() == null) {
writer.setTopicList(new ArrayList<Topic>());
}
if (writer.getEvaluationList() == null) {
writer.setEvaluationList(new ArrayList<Evaluation>());
}
if (writer.getBookList() == null) {
writer.setBookList(new ArrayList<Book>());
}
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
List<Topic> attachedTopicList = new ArrayList<Topic>();
for (Topic topicListTopicToAttach : writer.getTopicList()) {
topicListTopicToAttach = em.getReference(topicListTopicToAttach.getClass(), topicListTopicToAttach.getTopicname());
attachedTopicList.add(topicListTopicToAttach);
}
writer.setTopicList(attachedTopicList);
List<Evaluation> attachedEvaluationList = new ArrayList<Evaluation>();
for (Evaluation evaluationListEvaluationToAttach : writer.getEvaluationList()) {
evaluationListEvaluationToAttach = em.getReference(evaluationListEvaluationToAttach.getClass(), evaluationListEvaluationToAttach.getEvaluationPK());
attachedEvaluationList.add(evaluationListEvaluationToAttach);
}
writer.setEvaluationList(attachedEvaluationList);
List<Book> attachedBookList = new ArrayList<Book>();
for (Book bookListBookToAttach : writer.getBookList()) {
bookListBookToAttach = em.getReference(bookListBookToAttach.getClass(), bookListBookToAttach.getBookPK());
attachedBookList.add(bookListBookToAttach);
}
writer.setBookList(attachedBookList);
em.persist(writer);
for (Topic topicListTopic : writer.getTopicList()) {
topicListTopic.getWriterList().add(writer);
topicListTopic = em.merge(topicListTopic);
}
for (Evaluation evaluationListEvaluation : writer.getEvaluationList()) {
Writer oldWriterOfEvaluationListEvaluation = evaluationListEvaluation.getWriter();
evaluationListEvaluation.setWriter(writer);
evaluationListEvaluation = em.merge(evaluationListEvaluation);
if (oldWriterOfEvaluationListEvaluation != null) {
oldWriterOfEvaluationListEvaluation.getEvaluationList().remove(evaluationListEvaluation);
oldWriterOfEvaluationListEvaluation = em.merge(oldWriterOfEvaluationListEvaluation);
}
}
for (Book bookListBook : writer.getBookList()) {
Writer oldWriterOfBookListBook = bookListBook.getWriter();
bookListBook.setWriter(writer);
bookListBook = em.merge(bookListBook);
if (oldWriterOfBookListBook != null) {
oldWriterOfBookListBook.getBookList().remove(bookListBook);
oldWriterOfBookListBook = em.merge(oldWriterOfBookListBook);
}
}
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void edit(Writer writer) throws IllegalOrphanException, NonexistentEntityException, RollbackFailureException, Exception {
// remainder of code goes here
}
public void destroy(Integer id) throws IllegalOrphanException, NonexistentEntityException, RollbackFailureException, Exception {
// remainder of code goes here
}
public List<Writer> findWriterEntities() {
return findWriterEntities(true, -1, -1);
}
public List<Writer> findWriterEntities(int maxResults, int firstResult) {
return findWriterEntities(false, maxResults, firstResult);
}
private List<Writer> findWriterEntities(boolean all, int maxResults, int firstResult) {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(Writer.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
} finally {
em.close();
}
}
public Writer findWriter(Integer id) {
EntityManager em = getEntityManager();
try {
return em.find(Writer.class, id);
} finally {
em.close();
}
}
public int getWriterCount() {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<Writer> rt = cq.from(Writer.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
} finally {
em.close();
}
}
}