Cocoon
  1. Cocoon
  2. COCOON-1010

Memory Leak caused by cocoon:// protocol

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Critical Critical
    • Resolution: Fixed
    • Affects Version/s: 2.1.8
    • Fix Version/s: None
    • Component/s: * Cocoon Core
    • Labels:
      None
    • Environment:
      Operating System: All
      Platform: PC

      Description

      I pasted the mail from
      http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=107418715206665&w=2

      I found now a testcase within cocoon standard distro that has exact the same
      problems that I mentioned in my previous mails. It's the resource example in
      the xsp block: http://localhost:8888/samples/xsp/java/resolver which includes
      content generated by an xsp in an xsp.

      For those interested in redoing:
      1) set your JAVA_OPTS to -Xms64M -Xmx64M
      2) start cocoon with cocoon-servlet
      3) execute the encluded anteater script (you will need ant-1.6 and
         ant-contrib 0.6)

      --| start anteater file
      <?xml version="1.0" encoding="ISO-8859-1"?>
      <project name="Cocoon Stress Test" default="main">
      <taskdef resource="META-INF/Anteater.tasks"/>
      <typedef resource="META-INF/Anteater.types"/>
          <taskdef resource="net/sf/antcontrib/antcontrib.properties"/>

          <property name="url"
      value="http://localhost:8888/samples/xsp/java/resolver"/>
          
          <target name="main">
      <foreach
      list="0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,
      28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54
      ,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,8
      1,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,
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      726,727,728,729,730,731,732,733,734,735,736,737,738,739,740,741,742,743,744,745,
      746,747,748,749,750,751,752,753,754,755,756,757,758,759,760,761,762,763,764,765,
      766,767,768,769,770,771,772,773,774,775,776,777,778,779,780,781,782,783,784,785,
      786,787,788,789,790,791,792,793,794,795,796,797,798,799,800,801,802,803,804,805,
      806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824,825,
      826,827,828,829,830,831,832,833,834,835,836,837,838,839,840,841,842,843,844,845,
      846,847,848,849,850,851,852,853,854,855,856,857,858,859,860,861,862,863,864,865,
      866,867,868,869,870,871,872,873,874,875,876,877,878,879,880,881,882,883,884,885,
      886,887,888,889,890,891,892,893,894,895,896,897,898,899,900,901,902,903,904,905,
      906,907,908,909,910,911,912,913,914,915,916,917,918,919,920,921,922,923,924,925,
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      946,947,948,949,950,951,952,953,954,955,956,957,958,959,960,961,962,963,964,965,
      966,967,968,969,970,971,972,973,974,975,976,977,978,979,980,981,982,983,984,985,
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      ,4989,4990,4991,4992,4993,4994,4995,4996,4997,4998,4999" target="content"
      param=""/>
      </target>

      <target name="content">
      <httpRequest href="${url}">
      <match>
      <responseCode value="200"/>
      <regexp>An XSP Page using a source</regexp>
      </match>
      </httpRequest>
      </target>
      </project>
      --| end anteater file

      On my laptop with W2k, PIVM, IBM R40 after 2828 Iterations jetty runs out of
      memory. BTW, I tested this also last week but after 500 Iterations I thought
      that the problem doesn't happen to this resource.

                                          - o -

      This fact made my life much easier because I could debug Cocoon directly and
      not within our application.

                                          - o -
                                                                              
      Finally I think I found the Memory Leak. Since the C21 Core staff is highly
      guristic to me (from guru **gg**) I'm of course not sure if I'm right. But
      with my Fix my tests work ok now.

      Ok. Here we go. I tracked down the lifecycle of a SitemapSource and found
      that allready at creation of the Source the init() method makes pretty
      much work to prepare the pipeline. For this reason an extra method of
      the AbstractProcessingPipeline exists, the prepareInternal().

      SitemapSource.init()
          |
          +--> ...
               AbstractProcessingPipeline.prepareInternal()
                  |
                  +--> ...
                       AbstractProcessingPipeline.preparePipeline()
                          |
                          +--> ...
                               AbstractCachingProcessingPipeline.setupPipeline()
                                  |
                                  +--> ...
                                       AbstractProcessingPipeline.setupPipeline()
                                          |
                                          +--> ...
                                               ServerPagesGenerator.setup()

      [simplified callgraph, not complete]

      I made breakpoints to SitemapSource init() and recycle(). Every Source
      is recycled the right way! (So definetifely no problems with recycle)

      After this I digged down the code beginning from init() until I reached
      the generate() method of my own serverpage. I did this a few times and
      realized that setup got called twice!

      Ok, than I set a new breakpoint to ServerPagesGenerator.setup(), and
      indeed, for every included xsp, the setup() method got called twice.
      Than I walked the stack up from ServerPagesGenerator.setup() to the
      calling method and - surprise - it was SitemapSource.getInputSource().

      SitemapSource.getInputStream()
          |
          +--> ...
               AbstractProcessingPipeline.process()
                  |
                  +--> ...
                       AbstractProcessingPipeline.preparePipeline()
                          |
                          +--> ...
                               AbstractCachingProcessingPipeline.setupPipeline()
                                  |
                                  +--> ...
                                       AbstractProcessingPipeline.setupPipeline()
                                          |
                                          +--> ...
                                               ServerPagesGenerator.setup()
      [simplified callgraph, not complete]
                                              
          +-----------------------------------------------------------------+
          | Within cocoon:/ and cocoon:// resources Setup is called twice. |
          +-----------------------------------------------------------------+

      After this I made a quickfix to the SitemapSource constructor and
      AbstractProcessingPipeline.process(). I added an attribute to query
      the fact if we are in an internal pipeline:

      in SitemapSource constructor: After creation of the MutableEnvironmentFacade
      I added a Boolean to document the fact of an internal call:
          ...
          
          // The environment is a facade whose delegate can be changed in case of
      internal redirects
          this.environment = new MutableEnvironmentFacade(wrapper);
          
          // MGe
          this.environment.setAttribute( "internal.call", new Boolean( "true" ) );
          // end MGe
          
          // ...and put information passed from the parent request to the internal
      request
          if ( null != parameters ) {
              this.environment.getObjectModel().put(ObjectModelHelper.PARENT_CONTEXT,
      parameters);
          } else {
              this.environment.getObjectModel().remove
      (ObjectModelHelper.PARENT_CONTEXT);
          }
          ...

      in AbstractProcessingPipeline.process() then I query this parameter and only
      do a preparePipeline() if it is no internal call:
      /**
       * Process the given <code>Environment</code>, producing the output.
       */
      public boolean process(Environment environment)
      throws ProcessingException {
          // If this is an internal request, lastConsumer was reset!
          if (null == this.lastConsumer) {
              this.lastConsumer = this.serializer;
          }
          
          // MGe
          if ( null != environment.getAttribute( "internal.call" ) &&
               ((Boolean) environment.getAttribute( "internal.call" )).booleanValue
      () ) {
           // no prepare, because already done in prepareInternal()
          }
          else {
           this.preparePipeline(environment);
          }
          // end MGe
          ...

      With this fix my pages now run and run and run ...

                                          - o -
                                          
      What do you think. Does this help you? Is this a step in the right
      direction? Shall I prepare a patch for this? Can and how can I put
      it into bugzilla?
                                          
      And one question: In the SitemapSource the Treeprocessor is fetched in
      2 different ways. If the cocoon:// protocol is used the Processor is
      fetched via
        this.processor = (Processor)this.manager.lookup(Processor.ROLE);
      with the cocoon:/ protocol the statement is
        this.processor = CocoonComponentManager.getCurrentProcessor();
      The TreeProcessor itself is marked ThreadSafe, and that means there is
      one instance for the whole container. Did I miss something? Is it for
      performance reasons?

      Regards
      Michael

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            • Assignee:
              Unassigned
              Reporter:
              Michael Gerzabek
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