New JNI bindings

src/com/github/rjeschke/neetutils/dispose/Disposer.java

+/*
+ * Copyright (C) 2012 René Jeschke <rene_jeschke@yahoo.de>
+ *
+ * Licensed 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 com.github.rjeschke.neetutils.dispose;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+
+import com.github.rjeschke.neetutils.dispose.ReferenceList.Node;
+
+/**
+ * 
+ * @author René Jeschke (rene_jeschke@yahoo.de)
+ * 
+ */
+public class Disposer extends WeakReference<Disposable>
+{
+  private final Disposable disposable;
+  private final Node<Disposer> disposer;
+  private volatile boolean disposed = false;
+  final static ReferenceQueue<Disposable> refQueue;
+  final static ReferenceList<Disposer> disposers;
+
+  static
+  {
+    refQueue = new ReferenceQueue<Disposable>();
+    disposers = new ReferenceList<Disposer>();
+
+    final Thread thread = new Thread(new Cleaner());
+    thread.setName("neetutils-Disposer");
+    thread.setDaemon(true);
+    thread.start();
+  }
+
+  public Disposer(final Disposable referent, final Disposable disposable)
+  {
+    super(referent, refQueue);
+    this.disposable = disposable;
+    synchronized (disposers)
+    {
+      this.disposer = disposers.add(this);
+    }
+  }
+
+  public void dispose()
+  {
+    if (!this.disposed)
+    {
+      synchronized (disposers)
+      {
+        disposers.remove(this.disposer);
+      }
+      this.disposed = true;
+      this.disposable.dispose();
+    }
+  }
+
+  public boolean isDisposed()
+  {
+    return this.disposed;
+  }
+
+  private static final class Cleaner implements Runnable
+  {
+    public Cleaner()
+    {
+      // empty
+    }
+
+    @Override
+    public void run()
+    {
+      final ReferenceQueue<Disposable> refQueue = Disposer.refQueue;
+      for (;;)
+      {
+        try
+        {
+          ((Disposer)refQueue.remove()).dispose();
+        }
+        catch (final Throwable t)
+        {
+          //
+        }
+      }
+    }
+  }
+}