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java/org/apache/catalina/tribes/io/BufferPool15Impl.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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 org.apache.catalina.tribes.io;
+
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ *
+ * @version 1.0
+ */
+class BufferPool15Impl implements BufferPool.BufferPoolAPI {
+    protected int maxSize;
+    protected final AtomicInteger size = new AtomicInteger(0);
+    protected final ConcurrentLinkedQueue<XByteBuffer> queue =
+            new ConcurrentLinkedQueue<>();
+
+    @Override
+    public void setMaxSize(int bytes) {
+        this.maxSize = bytes;
+    }
+
+
+    @Override
+    public XByteBuffer getBuffer(int minSize, boolean discard) {
+        XByteBuffer buffer = queue.poll();
+        if ( buffer != null ) size.addAndGet(-buffer.getCapacity());
+        if ( buffer == null ) buffer = new XByteBuffer(minSize,discard);
+        else if ( buffer.getCapacity() <= minSize ) buffer.expand(minSize);
+        buffer.setDiscard(discard);
+        buffer.reset();
+        return buffer;
+    }
+
+    @Override
+    public void returnBuffer(XByteBuffer buffer) {
+        if ( (size.get() + buffer.getCapacity()) <= maxSize ) {
+            size.addAndGet(buffer.getCapacity());
+            queue.offer(buffer);
+        }
+    }
+
+    @Override
+    public void clear() {
+        queue.clear();
+        size.set(0);
+    }
+
+    public int getMaxSize() {
+        return maxSize;
+    }
+
+}