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openjfx9/modules/javafx.graphics/src/main/java/com/sun/ReentrantContextProviderCLQ.java

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   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.java2d;

  26 
  27 import java.lang.ref.Reference;
  28 import java.util.concurrent.ConcurrentLinkedQueue;
  29 
  30 /**
  31  * This ReentrantContextProvider implementation uses one ConcurrentLinkedQueue
  32  * to store all ReentrantContext instances (thread and its child contexts)
  33  *
  34  * Note: this implementation keeps less contexts in memory depending on the
  35  * concurrent active threads in contrary to a ThreadLocal provider. However,
  36  * it is slower in highly concurrent workloads.
  37  *
  38  * @param <K> ReentrantContext subclass
  39  */
  40 public abstract class ReentrantContextProviderCLQ<K extends ReentrantContext>
  41     extends ReentrantContextProvider<K>
  42 {
  43     // ReentrantContext queue to store all contexts
  44     private final ConcurrentLinkedQueue<Reference<K>> ctxQueue
  45         = new ConcurrentLinkedQueue<Reference<K>>();




   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun;
  27 
  28 import java.lang.ref.Reference;
  29 import java.util.concurrent.ConcurrentLinkedQueue;
  30 
  31 /**
  32  * This ReentrantContextProvider implementation uses one ConcurrentLinkedQueue
  33  * to store all ReentrantContext instances (thread and its child contexts)
  34  *
  35  * Note: this implementation keeps less contexts in memory depending on the
  36  * concurrent active threads in contrary to a ThreadLocal provider. However,
  37  * it is slower in highly concurrent workloads.
  38  *
  39  * @param <K> ReentrantContext subclass
  40  */
  41 public abstract class ReentrantContextProviderCLQ<K extends ReentrantContext>
  42     extends ReentrantContextProvider<K>
  43 {
  44     // ReentrantContext queue to store all contexts
  45     private final ConcurrentLinkedQueue<Reference<K>> ctxQueue
  46         = new ConcurrentLinkedQueue<Reference<K>>();


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