Best Practice to limit NotesViewEntryCollection from getAllEntries - xpages

Question

I want to create better web service that display collection from NotesView with pagination.
And I have found some performance issue of View.getAllEntries from bigger view.
On MongoDB, I can use findAll() with skip() and limit().
How can I do like that on Domino ?

Answer 1

Use the ViewNavigator class. If you are paging through a large view, it is much faster than view.getAllEntries().
You can acquire an instance of ViewNavigator with view.createViewNav() or a similar method. For best performance, call view.setAutoUpdate(false) before you acquire the navigator.
You can find lots more information by searching the web. This article looks like a good place to start.

Answer 2

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.ibm.commons.util.io.json.JsonJavaObject;
import lotus.domino.NotesException;
import lotus.domino.View;
import lotus.domino.ViewColumn;
import lotus.domino.ViewEntryCollection;
import lotus.domino.ViewNavigator;
import lotus.domino.ViewEntry;
private String consultView(View view, int counter,int position) throws Exception{
String strValue = "";
ViewNavigator nav;
int count = 0;
view.setAutoUpdate(false);
nav = view.createViewNav();
nav.setEntryOptions(ViewNavigator.VN_ENTRYOPT_NOCOUNTDATA);
nav.setBufferMaxEntries(400);
int limit = counter;
int skippedEntries = nav.skip(position);
String number = "";
if (skippedEntries == position) {
Map<Integer, String> columnNameMap = new HashMap<Integer, String>();
for (ViewColumn col : (List<ViewColumn>) view.getColumns()) {
if (col.getColumnValuesIndex() < 65535) {
columnNameMap.put(col.getColumnValuesIndex(), col.getItemName());
}
}
List nodeData = new ArrayList();
ViewEntry entry = nav.getCurrent();
while (entry != null && count <= (limit - 1)) {
if (!entry.isCategory()) {
try {
HashMap<String, Object> entryMap = new HashMap<String, Object>();
count++;
List<Object> columnValues = entry.getColumnValues();
entryMap.put("unid", entry.getUniversalID());
entryMap.put("position", entry.getPosition('.'));
entryMap.put("pos", entry.getPosition('.'));
entryMap.put("userpos", count);
for (Integer index : columnNameMap.keySet())
entryMap.put(columnNameMap.get(index).toString(),columnValues.get(index));
nodeData.add(entryMap);
} catch (Exception e) {
e.printStackTrace();
}
}
ViewEntry tmpentry = nav.getNext(entry);
entry.recycle();
entry = tmpentry;
}
JsonJavaObject returnJSON = new JsonJavaObject();
returnJSON.put("errorcode", 0);
returnJSON.put("errormessage", "");
returnJSON.put("total",getViewCount(view));
returnJSON.put("data", nodeData);
strValue = returnJSON.toString();
}
nav.recycle();
view.recycle();
return strValue;
}
private int getViewCount(View view) throws NotesException {
int count = 0;
ViewEntryCollection entryCollection = view.getAllEntries();
count = entryCollection.getCount();
entryCollection.recycle();
return count;
}
}

Answer 3

This below function get all AllEntries from view and the outputs result in JSON object. Please try the following and let me know if it works.
private String consultView(View view, int counter,int position) throws Exception{
String strValue = "";
ViewNavigator nav;
int count = 0;
view.setAutoUpdate(false);
nav = view.createViewNav();
nav.setEntryOptions(ViewNavigator.VN_ENTRYOPT_NOCOUNTDATA);
nav.setBufferMaxEntries(400);
int limit = counter;
int skippedEntries = nav.skip(position);
String number = "";
int inde = 111;
if (skippedEntries == position) {
Map<Integer, String> columnNameMap = new HashMap<Integer, String>();
for (ViewColumn col : (List<ViewColumn>) view.getColumns()) {
if (col.getColumnValuesIndex() < 65535 && Utilisties.containsVar(viewObject.getRetCols(), col.getItemName())) {
columnNameMap.put(col.getColumnValuesIndex(), col.getItemName());
}
}
List nodeData = new ArrayList();
ViewEntry entry = nav.getCurrent();
while (entry != null && count <= (limit - 1)) {
if (!entry.isCategory()) {
try {
HashMap<String, Object> entryMap = new HashMap<String, Object>();
count++;
List<Object> columnValues = entry.getColumnValues();
entryMap.put("unid", entry.getUniversalID());
entryMap.put("position", entry.getPosition('.'));
entryMap.put("pos", entry.getPosition('.'));
entryMap.put("userpos", count);
for (Integer index : columnNameMap.keySet())
entryMap.put(columnNameMap.get(index).toString(),columnValues.get(index));
nodeData.add(entryMap);
} catch (Exception e) {
e.printStackTrace();
}
}
ViewEntry tmpentry = nav.getNext(entry);
entry.recycle();
entry = tmpentry;
}
JsonJavaObject returnJSON = new JsonJavaObject();
returnJSON.put("errorcode", 0);
returnJSON.put("errormessage", "");
if(viewObject.getGetCount())
returnJSON.put("total",getViewCount(view));
returnJSON.put("data", nodeData);
strValue = returnJSON.toString();
}
nav.recycle();
view.recycle();
return strValue;