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openjfx9/modules/javafx.graphics/src/main/java/com/sun/ReentrantContextProvider.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.lang.ref.SoftReference;
  29 import java.lang.ref.WeakReference;
  30 
  31 /**
  32  * This abstract ReentrantContextProvider helper class manages the creation,
  33  * storage, and retrieval of concrete ReentrantContext instances which can be
  34  * subclassed to hold cached contextual data.
  35  *
  36  * It supports reentrancy as every call to acquire() provides a new unique context
  37  * instance that must later be returned for reuse by a call to release(ctx)
  38  * (typically in a try/finally block).
  39  *
  40  * It has a couple of abstract implementations which store references in a queue
  41  * and/or thread-local storage.
  42  * The Providers can be configured to hold ReentrantContext instances in memory
  43  * using hard, soft or weak references.
  44  *
  45  * The acquire() and release() methods are used to retrieve and return the contexts.




   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.lang.ref.SoftReference;
  30 import java.lang.ref.WeakReference;
  31 
  32 /**
  33  * This abstract ReentrantContextProvider helper class manages the creation,
  34  * storage, and retrieval of concrete ReentrantContext instances which can be
  35  * subclassed to hold cached contextual data.
  36  *
  37  * It supports reentrancy as every call to acquire() provides a new unique context
  38  * instance that must later be returned for reuse by a call to release(ctx)
  39  * (typically in a try/finally block).
  40  *
  41  * It has a couple of abstract implementations which store references in a queue
  42  * and/or thread-local storage.
  43  * The Providers can be configured to hold ReentrantContext instances in memory
  44  * using hard, soft or weak references.
  45  *
  46  * The acquire() and release() methods are used to retrieve and return the contexts.


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