Adding BoundedThreadPool and BlockingBoolean
Updating EventuallyConsistentMap to use BoundedThreadPool for broadcast threads,
and disabling anti-entropy for now.
Change-Id: Id1bfcdaf1d0a19745fe7336e4ac9eaf649871d5d
diff --git a/utils/misc/src/main/java/org/onlab/util/BlockingBoolean.java b/utils/misc/src/main/java/org/onlab/util/BlockingBoolean.java
new file mode 100644
index 0000000..cffdc1a
--- /dev/null
+++ b/utils/misc/src/main/java/org/onlab/util/BlockingBoolean.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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 org.onlab.util;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.AbstractQueuedSynchronizer;
+
+/**
+ * Mutable boolean that allows threads to wait for a specified value.
+ */
+public class BlockingBoolean extends AbstractQueuedSynchronizer {
+
+ private static final int TRUE = 1;
+ private static final int FALSE = 0;
+
+ /**
+ * Creates a new blocking boolean with the specified value.
+ *
+ * @param value the starting value
+ */
+ public BlockingBoolean(boolean value) {
+ setState(value ? TRUE : FALSE);
+ }
+
+ /**
+ * Causes the current thread to wait until the boolean equals the specified
+ * value unless the thread is {@linkplain Thread#interrupt interrupted}.
+ *
+ * @param value specified value
+ * @throws InterruptedException
+ */
+ public void await(boolean value) throws InterruptedException {
+ acquireSharedInterruptibly(value ? TRUE : FALSE);
+ }
+
+ /**
+ * Causes the current thread to wait until the boolean equals the specified
+ * value unless the thread is {@linkplain Thread#interrupt interrupted},
+ * or the specified waiting time elapses.
+ *
+ * @param value specified value
+ * @param timeout the maximum time to wait
+ * @param unit the time unit of the {@code timeout} argument
+ * @return {@code true} if the count reached zero and {@code false}
+ * if the waiting time elapsed before the count reached zero
+ * @throws InterruptedException
+ */
+ public boolean await(boolean value, long timeout, TimeUnit unit)
+ throws InterruptedException {
+ return tryAcquireSharedNanos(value ? TRUE : FALSE, unit.toNanos(timeout));
+ }
+
+ protected int tryAcquireShared(int acquires) {
+ return (getState() == acquires) ? 1 : -1;
+ }
+
+ /**
+ * Sets the value of the blocking boolean.
+ *
+ * @param value new value
+ */
+ public void set(boolean value) {
+ releaseShared(value ? TRUE : FALSE);
+ }
+
+ /**
+ * Gets the value of the blocking boolean.
+ *
+ * @return current value
+ */
+ public boolean get() {
+ return getState() == TRUE;
+ }
+
+ protected boolean tryReleaseShared(int releases) {
+ // Signal on state change only
+ int state = getState();
+ if (state == releases) {
+ return false;
+ }
+ return compareAndSetState(state, releases);
+ }
+
+}