/*
 * Copyright 2011 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.ssl;

import java.nio.ByteBuffer;

import javax.net.ssl.SSLEngine;

public class DefaultSslBufferPool implements SslBufferPool {

    private static final int DEFAULT_POOL_SIZE = MAX_PACKET_SIZE * 1024;

    private final ByteBuffer[] pool;
    private final int maxBufferCount;
    private int index;

    /**
     * Creates a new buffer pool whose size is {@code 18113536}, which can
     * hold {@code 1024} buffers.
     */
    public DefaultSslBufferPool() {
        this(DEFAULT_POOL_SIZE);
    }

    /**
     * Creates a new buffer pool.
     *
     * @param maxPoolSize the maximum number of bytes that this pool can hold
     */
    public DefaultSslBufferPool(int maxPoolSize) {
        if (maxPoolSize <= 0) {
            throw new IllegalArgumentException("maxPoolSize: " + maxPoolSize);
        }

        int maxBufferCount = maxPoolSize / MAX_PACKET_SIZE;
        if (maxPoolSize % MAX_PACKET_SIZE != 0) {
            maxBufferCount ++;
        }

        pool = new ByteBuffer[maxBufferCount];
        this.maxBufferCount = maxBufferCount;
    }

    /**
     * Returns the maximum size of this pool in byte unit.  The returned value
     * can be somewhat different from what was specified in the constructor.
     */
    public int getMaxPoolSize() {
        return maxBufferCount * MAX_PACKET_SIZE;
    }

    /**
     * Returns the number of bytes which were allocated but have not been
     * acquired yet.  You can estimate how optimal the specified maximum pool
     * size is from this value.  If it keeps returning {@code 0}, it means the
     * pool is getting exhausted.  If it keeps returns a unnecessarily big
     * value, it means the pool is wasting the heap space.
     */
    public synchronized int getUnacquiredPoolSize() {
        return index * MAX_PACKET_SIZE;
    }

    public ByteBuffer acquireBuffer() {
        synchronized {
            if (index == 0) {
                return ByteBuffer.allocate(MAX_PACKET_SIZE);
            } else {
                return (ByteBuffer) pool[-- index].clear();
            }
        }
    }

    public void releaseBuffer(ByteBuffer buffer) {
        synchronized {
            if (index < maxBufferCount) {
                pool[index ++] = buffer;
            }
        }
    }
}

@@ -2470,16 +2470,29 @@
  public 
+synchronized 
 ByteBuff
@@ -2516,35 +2516,8 @@
 ) %7B%0A
-        synchronized %7B%0A    
     
@@ -2534,28 +2534,24 @@
 dex == 0) %7B%0A
-    
             
@@ -2603,20 +2603,16 @@
         
-   
- 
 %7D else %7B
@@ -2612,20 +2612,16 @@
  else %7B%0A
-    
         
@@ -2668,30 +2668,16 @@
 lear();%0A
-            %7D%0A
         
@@ -2696,16 +2696,29 @@
  public 
+synchronized 
 void rel
@@ -2753,35 +2753,8 @@
 ) %7B%0A
-        synchronized %7B%0A    
     
@@ -2795,28 +2795,24 @@
             
-   
- 
 pool%5Bindex +
@@ -2828,22 +2828,8 @@
 er;%0A
-            %7D%0A
     

Fix syntax. See #342