39 [WIP] cleans up the reusable buffers and creates both real and

complex variants.

src/main/java/io/github/dsheirer/sample/buffer/OverflowableReusableBufferTransferQueue.java

@@ -0,0 +1,69 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.sample.buffer;
+
+import io.github.dsheirer.sample.OverflowableTransferQueue;
+
+public class OverflowableReusableBufferTransferQueue<T extends ReusableBuffer> extends OverflowableTransferQueue<T>
+{
+    /**
+     * Concurrent transfer queue that couples a higher-throughput linked transfer queue with an atomic integer for
+     * monitoring queue size.  When the queue size exceeds maximum size (overflow), all inbound elements are ignored
+     * until the queue size is reduced to or below the reset threshold.
+     *
+     * This implementation includes special handling for reusable complex buffers.
+     *
+     * @param maximumSize of the queue.  Overflow state will occur once queue size exceeds this value.
+     * @param resetThreshold for resetting overflow state to normal, once queue size is at or below this value.
+     */
+    public OverflowableReusableBufferTransferQueue(int maximumSize, int resetThreshold)
+    {
+        super(maximumSize, resetThreshold);
+    }
+
+    /**
+     * Overrides the overflow method to decrement the user count on any buffers that are being discarded when the queue
+     * is in an overflow state.
+     *
+     * @param t reusableBuffer that will be discarded
+     */
+    @Override
+    protected void overflow(T t)
+    {
+        t.decrementUserCount();
+    }
+
+    /**
+     * Overrides the buffer clear method to decrement the user count on each buffer that is being cleared from the queue.
+     */
+    @Override
+    public void clear()
+    {
+        synchronized(mQueue)
+        {
+            T buffer = mQueue.poll();
+
+            while(buffer != null)
+            {
+                buffer.decrementUserCount();
+                buffer = mQueue.poll();
+            }
+
+            mCounter.set(0);
+            mOverflow.set(false);
+        }
+    }
+}