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I'm looking for a library that can send messages from a process. It needs to be asynchronous, reliable and ordered. I don't care if it drops messages when the queue is full, but it has be able to report that. It cannot be blocking.
It should be possible to plug it into a standard app which already uses pthreads. (adding thread-safe to requirements)
I've looked at some possible solutions that could solve it... opening an erlang port and running an erlang vm for collecting messages seems to be promising, but I'm not sure if ports themselves can start sending data? It would be perfect, if I could create something like an embedded node with it's own sender.
I could of course implement something that keeps a queue in shm with a known key, or through a fifo, but that's error prone... I'd rather reuse some existing solution.
Can someone think of any (rather high-level) library that does that?
Message queues are implemented by many Unices.
POSIX message queues.
System V IPC message queues. (an older standard).
There are also many Message Oriented Middleware (MOM) platforms that provide distributed, reliable, transactional messaging.
There is Boost.MPI or you can use networking on the loopback interface. (Lots of libs for that.)
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I have (for exercise) to create a server, to handle client connections. The subject talk about C programming, but I already did it. Id'like to do it again with node js. I don't need a http server, just a simple module which handle raw cmd. The protocol is given within the subject, and I will implement the logic of my app by my side. I am just new in node js programming, and its a light subject (about 5-6 commands). Do you know where I can start? Name/doc of a simple module, or just the minimalist code to handle client connection/command reading? (Cmds are simple strings, followed by \n).
I've searched inside npm website, but I just find http's server or something more elaborate, and I don't need so much feature. Just connections, commands in raw format and some events to handle nicely things like connection losts, read wich failed, etc...
I missed this documentation page: Net module
Thank you all!
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We are implementing a communication system where client (mobile device) sends messages thru MQTT-MQ to the backend systems. I would like to benchmark the load performance of the MQTT-MQ data path.
Could you please recommend if there is any opensource (or commercial) performance test tool which could load test the MQTT-MQ data path.
Try out Apache JMeter, it provides the following test elements:
JMS Publisher
JMS Subscriber
JMS Point-to-Point
which should be quite enough to conduct your testing.
Just download appropriate MQ Java client libraries, drop them to JMeter's /lib folder, restart JMeter and you should be able to use the relevant classes to send messages to queues and read them.
See the following reference guides:
Building a JMS Topic Test Plan
Building a JMS Point-to-Point Test Plan
Building a JMS Testing Plan - Apache JMeter
Both mqtt-spy and mqtt-spy-daemon support concurrent messaging. You can define a script that sends messages concurrently, or multiple scripts which is normally easier. To have multiple concurrent MQTT clients connected to the broker/server, you can run multiple mqtt-spy connections or multiple mqtt-spy-daemon instances, each having their own configuration and scripts.
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In my Node.js application I wanted to connect the Hazelcast node instance and access the Queue/Hashmap of Hazelcast Node. Is there any node.js module available to do this .
Thanks in advance.
Thought this question was asked over a year ago, some things have changed.
Hazelcast Node.js client in fact does exist and currently provides following features
implementation of Open Client Binary Protocol
Map
Get
Put
Remove
Smart Client - clients connect to each cluster node.
Since each data partition uses the well known and consistent hashing algorithm, each client can send an operation to the relevant cluster node, which increases the overall throughput and efficiency. The client doesn't need to be restarted in case of adding or removing nodes from the cluster.
Distributed Object Listener
Lifecycle Service
Thank you
As far as I know, there is no node.js library for Hazelcast. Some of the functionality is exposed through Memcached btw.
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HaskellNet seems to be the only available IMAP client library for Haskell, but it doesn't seem to support TLS connections, which is necessary for accessing Gmail's IMAP servers. Are there any alternative Haskell libraries or workarounds?
Sorry to dredge up quite an old post here, but I came across this thread when I had the same issue a while back, and have since written a library which adds SSL/TLS support to HaskellNet. It makes use of another library, connection, which I don't think existed at the time this question was originally posted, and which made adding TLS support significantly easier than it used to be. You can find it here: http://hackage.haskell.org/package/HaskellNet-SSL
Hopefully this will be of some use to anybody else who stumbles upon this thread looking for information about connecting to gmail accounts. In fact, for gmail specifically, there is sample code for connecting to their IMAP/SMTP servers in the repository.
Check out imapget on hackage. It gets around this limitation by creating a proxy port.
Looks like new library appeared since your last post: imap: An efficient IMAP client library, with SSL and streaming.
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Can anyone recommend a good (preferably free) application or service to monitor the uptime of a server? And possibly send out an alert by email or sms when it goes down? Statistics are not really needed, it's just about knowing when a server goes down.
It depends how "sophisticated" tool you'd like to have (and install of course). You can use simple cron script on another server, or software designed for server monitoring. I've got experience and I can recommend you Zabbix or Nagios, but you can choose another one.
Try this
GAEAPIMonitor
http://www.honcheng.com/2010/12/GAEAPIMonitor---Open-source-API-monitoring-tool-on-Google-AppEngine
It is open source, written in python for AppEngine, so you can just run it on your own AppEngine account. Alerts you with a Twitter DMs when server is down, content has changed or has not changed, if an API is returning an invalid JSON if it is supposed to return JSON.
These are a few monitoring tools that you can try out
Free solutions
System commands: Nothing beats default commands like top, vmstat, iostat, netstat etc when it comes to knowing the health of a system
SeaLion: It is a cloudbased monitoring solution. What it does is basically execute all default system profiling commands (like top, vmstat etc) and present it in a very intuitive timeline format. It installation procedure is one of the easiest I have come across
Nagios: Though very complicate to use and configure, it is very
robust and most deployed solution available
Cacti
Zabbix
Paid solutions
New Relic
Server density
Copper Egg