Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  *
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at packager/legal/LICENSE.txt.
  *
  * GPL Classpath Exception:
  * Oracle designates this particular file as subject to the "Classpath"
  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
  *
  * Modifications:
  * If applicable, add the following below the License Header, with the fields
  * enclosed by brackets [] replaced by your own identifying information:
  * "Portions Copyright [year] [name of copyright owner]"
  *
  * Contributor(s):
  * If you wish your version of this file to be governed by only the CDDL or
  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
  */
 
 package com.sun.enterprise.resource.pool;
 
 
 import  javax.transaction.Transaction;
Associates a resource with the thread. When the same thread is used again, it checks whether the resource associated with the thread can serve the request.

Author(s):
Aditya Gore, Jagadish Ramu
 
 public class AssocWithThreadResourcePool extends ConnectionPool {
 
             new ThreadLocal<AssocWithThreadResourceHandle>();
 
     public AssocWithThreadResourcePool(PoolInfo poolInfoHashtable env)
             throws PoolingException {
         super(poolInfoenv);
     }
 
     @Override
     protected void initializePoolDataStructure() throws PoolingException {
          = DataStructureFactory.getDataStructure(
                 "com.sun.enterprise.resource.pool.datastructure.ListDataStructure",
                 ,
                 this);
     }


    
Prefetch is called to check whether there there is a free resource is already associated with the thread Only when prefetch is unable to find a resource, normal routine (getUnenlistedResource) will happen.

Parameters:
spec ResourceSpec
alloc ResourceAllocator
tran Transaction
Returns:
ResourceHandle resource associated with the thread, if any
 
     protected ResourceHandle prefetch(ResourceSpec spec,
                                       ResourceAllocator alloc, Transaction tran) {
         if (ar != null) {
             //synch on ar and do a quick-n-dirty check to see if the local
             //resource is usable at all
             synchronized (ar.lock) {
                 if ((ar.getThreadId() != Thread.currentThread().getId()) ||
                         ar.hasConnectionErrorOccurred() ||
                         ar.isDirty() || !ar.isAssociated()) {
                     //we were associated with someone else or resource error 
                    //occurred or resource was disassociated and used by some one else. So evict
                    //NOTE: We do not setAssociated to false here since someone
                    //else has associated this resource to themself. Also, if
                    //the eviction is because of a resourceError, the resource is
                    //not going to be used anyway.
                    .remove();
                    return null;
                }
                if (ar.getResourceState().isFree() &&
                        ar.getResourceState().isUnenlisted()) {
                    if () {
                        if (!alloc.matchConnection(ar)) {
                            //again, since the credentials of the caller don't match
                            //evict from ThreadLocal
                            //also, mark the resource as unassociated and make this resource
                            //potentially usable
                            .remove();
                            ar.setAssociated(false);
                            if( != null){
                                .connectionNotMatched();
                            }
                            return null;
                        }
                        if( != null){
                            .connectionMatched();
                        }
                    }
                    if (!isConnectionValid(aralloc)) {
                        .remove();
                        ar.setAssociated(false);
                        // disassociating the connection from the thread.
                        // validation failure will mark the connectionErrorOccurred flag
                        // and the connection will be removed whenever it is retrieved again
                        // from the pool.
                        return null;
                    }
                    setResourceStateToBusy(ar);
                    if ( > 0) {
                        ar.incrementUsageCount();
                    }
                    if( != null) {
                        .connectionUsed(ar.getId());
                        //Decrement numConnFree
                        .decrementNumConnFree();
                        
                    }
                    return ar;
                }
            }
        }
        return null;
    }
    @Override
    protected Resizer initializeResizer() {
        return new AssocWithThreadPoolResizer(thisthis,
                );
    }

    
to associate a resource with the thread

Parameters:
h ResourceHandle
        if (h != null) {
            synchronized (h.lock) {
                h.setThreadId(Thread.currentThread().getId());
                h.setAssociated(true);
                .set(h);
            }
        }
    }

    
check whether the resource is unused

Parameters:
h ResourceHandle
Returns:
boolean representing resource usefullness
    protected boolean isResourceUnused(ResourceHandle h) {
        return h.getResourceState().isFree() && !((AssocWithThreadResourceHandleh).isAssociated();
    }
    // this is the RI getResource() with some modifications
    
return resource in free list. If none is found, returns null
                                                   ResourceAllocator alloc, Transaction tranthrows PoolingException {
        ResourceHandle result;
        result = super.getUnenlistedResource(specalloctran);
        //It is possible that Resizer might have marked the resource for recycle
        //and hence we should not use this resource.
        if(result != null) {
            synchronized(result.lock) {
                if(.getAllResources().contains(result) &&
                        ((AssocWithThreadResourceHandle)result).isDirty()) {
                    //Remove the resource and set to null
                    .removeResource(result);
                    result = null;
                }
            }            
        }
        //If we came here, that's because free doesn't have anything
        //to offer us. This could be because:
        //1. All free resources are associated
        //2. There are no free resources
        //3. We cannot create anymore free resources
        //Handle case 1 here
        //DISASSOCIATE
        if (result == null) {
            synchronized (this) {
                
                for (ResourceHandle resource : .getAllResources()) {
                    synchronized (resource.lock) {
                        //though we are checking resources from within the free list,
                        //we could have a situation where the resource was free upto
                        //this point, put just before we entered the synchronized block,
                        //the resource "h" got used by the thread that was associating it
                        //so we need to check for isFree also
                        if (resource.getResourceState().isUnenlisted() &&
                                resource.getResourceState().isFree() && 
                                !(((AssocWithThreadResourceHandleresource).isDirty())) {
                            if (!matchConnection(resourcealloc)) {
                                continue;
                            }
                            if (resource.hasConnectionErrorOccurred()) {
                                continue;
                            }
                            result = resource;
                            setResourceStateToBusy(result);
                            ((AssocWithThreadResourceHandleresult).setAssociated(false);
                            break;
                        }
                    }
                }
            }
        }
        if (.get() == null) {
            setInThreadLocal((AssocWithThreadResourceHandleresult);
        }
        return result;
    }

    
return the resource back to pool only if it is not associated with the thread.

Parameters:
h ResourceHandle
    protected synchronized void freeUnenlistedResource(ResourceHandle h) {
        if (this.cleanupResource(h)) {
            if (h instanceof AssocWithThreadResourceHandle) {
                //Only when resource handle usage count is more than maxConnUsage
                if ( > 0 &&
                        h.getUsageCount() >= ) {
                    performMaxConnectionUsageOperation(h);
                } else {
                    if (!((AssocWithThreadResourceHandleh).isAssociated()) {
                        .returnResource(h);
                    }
                    //update monitoring data
                    if ( != null) {
                        .decrementConnectionUsed(h.getId());
                        .incrementNumConnFree(false);
                    }
                }
                //for both the cases of free.add and maxConUsageOperation, a free resource is added.
                // Hence notify waiting threads
                notifyWaitingThreads();
            }
        }
    }

    
destroys the resource

Parameters:
resourceHandle resource to be destroyed
    public void deleteResource(ResourceHandle resourceHandle) {
        try {
            super.deleteResource(resourceHandle);
        } finally {
            //Note: here we are using the connectionErrorOccurred flag to indicate
            //that this resource is no longer usable. This flag would be checked while
            //getting from ThreadLocal
            //The main intention of marking this is to handle the case where 
            //failAllConnections happens
            //Note that setDirty only happens here - i.e during destroying of a 
            //resource
            synchronized (resourceHandle.lock) {
                ((AssocWithThreadResourceHandleresourceHandle).setDirty();
            }
        }
    }
New to GrepCode? Check out our FAQ X