Author: mturk
Date: Wed May 4 10:03:28 2011
New Revision: 1099391
URL: http://svn.apache.org/viewvc?rev=1099391&view=rev
Log:
Add atomic refcount wrapper over AtomicInteger
Added:
commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/AtomicRefcount.java
(with props)
Added:
commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/AtomicRefcount.java
URL:
http://svn.apache.org/viewvc/commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/AtomicRefcount.java?rev=1099391&view=auto
==============================================================================
---
commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/AtomicRefcount.java
(added)
+++
commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/AtomicRefcount.java
Wed May 4 10:03:28 2011
@@ -0,0 +1,76 @@
+/*
+ * 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.commons.runtime;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Atomic reference counter.
+ * Used by the objects that need to be destroyed when reference
+ * counting is zero.
+ */
+public final class AtomicRefcount extends AtomicInteger
+{
+
+ /**
+ * Creates a new object with retention counter set to one.
+ */
+ public AtomicRefcount()
+ {
+ super(1);
+ }
+
+ /**
+ * True if retention counter equals one.
+ */
+ public boolean unique()
+ {
+ return get() == 1;
+ }
+
+ /**
+ * Get retention counter.
+ */
+ public int references()
+ {
+ return get();
+ }
+
+ /**
+ * Increase retention.
+ */
+ public void retain()
+ {
+ incrementAndGet();
+ }
+
+ /**
+ * Decrease retention by decrementing the reference counter.
+ * User of this method will usually destroy a guarded object when
+ * the reference counter value is unique.
+ *
+ * @return {@code true} if the object can be released.
+ */
+ public boolean release()
+ {
+ if (decrementAndGet() == 0)
+ return true;
+ else
+ return false;
+ }
+}
Propchange:
commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/AtomicRefcount.java
------------------------------------------------------------------------------
svn:eol-style = native
