Update #0 - First Release

sources/main/java/com/google/common/base/FinalizablePhantomReference.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2007 The Guava Authors
+ *
+ * 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.google.common.base;
+
+import java.lang.ref.PhantomReference;
+import java.lang.ref.ReferenceQueue;
+
+/**
+ * Phantom reference with a {@code finalizeReferent()} method which a background
+ * thread invokes after the garbage collector reclaims the referent. This is a
+ * simpler alternative to using a {@link ReferenceQueue}.
+ *
+ * <p>
+ * Unlike a normal phantom reference, this reference will be cleared
+ * automatically.
+ *
+ * @author Bob Lee
+ * @since 2.0 (imported from Google Collections Library)
+ */
+public abstract class FinalizablePhantomReference<T> extends PhantomReference<T> implements FinalizableReference {
+	/**
+	 * Constructs a new finalizable phantom reference.
+	 *
+	 * @param referent to phantom reference
+	 * @param queue    that should finalize the referent
+	 */
+	protected FinalizablePhantomReference(T referent, FinalizableReferenceQueue queue) {
+		super(referent, queue.queue);
+		queue.cleanUp();
+	}
+}