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restrestletapache-httpclient-4.x

Attaching Apache HTTP Client to RESTlet client

I'm using RESTlet as Server and Client. Server is running over Tomcat and I can access it from browser.

For Client, I'm using org.restlet.resource.ClientResource. It works fine if I send a few requests to that server, but if I send a few hundred calls it breaks:

Fev 20, 2013 12:59:43 PM org.restlet.engine.connector.ClientConnectionHelper start
INFO: Starting the internal [HTTP/1.1] client
(some calls work)
Fev 20, 2013 1:00:49 PM org.restlet.util.SelectionRegistration block
WARNING: The thread blocked at the cyclic barrier has timed out
java.util.concurrent.TimeoutException
    at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:250)
    at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:427)
    at org.restlet.util.SelectionRegistration.block(SelectionRegistration.java:191)
    at org.restlet.engine.io.NbChannelInputStream.onFill(NbChannelInputStream.java:230)
    at org.restlet.engine.io.Buffer.process(Buffer.java:601)
    at org.restlet.engine.io.NbChannelInputStream.read(NbChannelInputStream.java:307)
    at java.io.InputStream.read(InputStream.java:101)
    at org.restlet.engine.io.BioUtils.copy(BioUtils.java:80)
    at org.restlet.engine.io.NioUtils.copy(NioUtils.java:147)
    at org.restlet.representation.ReadableRepresentation.write(ReadableRepresentation.java:104)
    at org.restlet.representation.ChannelRepresentation.write(ChannelRepresentation.java:76)
    at org.restlet.representation.ChannelRepresentation.write(ChannelRepresentation.java:82)

Exception in thread "main" java.io.IOException: The thread blocked at the cyclic barrier has timed out.
    at org.restlet.util.SelectionRegistration.block(SelectionRegistration.java:197)
    at org.restlet.engine.io.NbChannelInputStream.onFill(NbChannelInputStream.java:230)
    at org.restlet.engine.io.Buffer.process(Buffer.java:601)
    at org.restlet.engine.io.NbChannelInputStream.read(NbChannelInputStream.java:307)
    at java.io.InputStream.read(InputStream.java:101)
    at org.restlet.engine.io.BioUtils.copy(BioUtils.java:80)
    at org.restlet.engine.io.NioUtils.copy(NioUtils.java:147)
    at org.restlet.representation.ReadableRepresentation.write(ReadableRepresentation.java:104)
    at org.restlet.representation.ChannelRepresentation.write(ChannelRepresentation.java:76)
    at org.restlet.representation.ChannelRepresentation.write(ChannelRepresentation.java:82)
Caused by: java.util.concurrent.TimeoutException
    at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:250)
    at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:427)
    at org.restlet.util.SelectionRegistration.block(SelectionRegistration.java:191)
    ... 11 more

I wanna use Apache HTTP Client to be able to do more calls, but I can't find documentation on how to attach it.

Solution

  • Every evidence points this error to be internal in RESTlet client. Instead of using it, I used URL.getInputStream(), and with that I was able to easily do 10K sequential calls to my RESTlet server. Of course URL is way simple, it's unable to handle errors and shouldn't be used in production, but it proved RESTlet isn't worth it.

    I also managed to make Benchmark comparing Axis2 and RESTlet as server, and they had same performance taking 3-5 milisecs to answer a request, I expected REST to be faster... I implemented REST server directly from Servlet and it too 0-1 milisecs to respond. Because of that I decided to drop REST and stick with SOAP Axis2, it's not slower than RESTlet and just a few milisecs slower than Servlet, but it way more flexible and powerful.