1 /*
   2  * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   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 jdk.incubator.http.internal.common;
  26 
  27 import java.nio.ByteBuffer;
  28 import java.util.List;
  29 import java.util.Objects;
  30 import java.util.function.Supplier;
  31 import java.util.stream.Collectors;
  32 
  33 public class ByteBufferReference  implements Supplier<ByteBuffer> {
  34 
  35     private ByteBuffer buffer;
  36     private final ByteBufferPool pool;
  37 
  38     public static ByteBufferReference of(ByteBuffer buffer) {
  39         return of(buffer, null);
  40     }
  41 
  42     public static ByteBufferReference of(ByteBuffer buffer, ByteBufferPool pool) {
  43         Objects.requireNonNull(buffer);
  44         return new ByteBufferReference(buffer, pool);
  45     }
  46 
  47     public static ByteBuffer[] toBuffers(ByteBufferReference... refs) {
  48         ByteBuffer[] bufs = new ByteBuffer[refs.length];
  49         for (int i = 0; i < refs.length; i++) {
  50             bufs[i] = refs[i].get();
  51         }
  52         return bufs;
  53     }
  54 
  55     public static ByteBufferReference[] toReferences(ByteBuffer... buffers) {
  56         ByteBufferReference[] refs = new ByteBufferReference[buffers.length];
  57         for (int i = 0; i < buffers.length; i++) {
  58             refs[i] = of(buffers[i]);
  59         }
  60         return refs;
  61     }
  62 
  63 
  64     public static void clear(ByteBufferReference[] refs) {
  65         for(ByteBufferReference ref : refs) {
  66             ref.clear();
  67         }
  68     }
  69 
  70     private ByteBufferReference(ByteBuffer buffer, ByteBufferPool pool) {
  71         this.buffer = buffer;
  72         this.pool = pool;
  73     }
  74 
  75     @Override
  76     public ByteBuffer get() {
  77         ByteBuffer buf = this.buffer;
  78         assert buf!=null : "getting ByteBuffer after clearance";
  79         return buf;
  80     }
  81 
  82     public void clear() {
  83         ByteBuffer buf = this.buffer;
  84         assert buf!=null : "double ByteBuffer clearance";
  85         this.buffer = null;
  86         if (pool != null) {
  87             pool.release(buf);
  88         }
  89     }
  90 }