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apply patch from https://issues.apache.org/activemq/browse/AMQ-2054 

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@734256 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gary Tully 2009-01-13 22:15:25 +00:00
parent b5b6a0834d
commit 20006a030d
1 changed files with 18 additions and 15 deletions
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13
activemq-core/src/main/java/org/apache/activemq/usage/Usage.java
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@ -55,7 +55,7 @@ public abstract class Usage<T extends Usage> implements Service {
private List<T> children = new CopyOnWriteArrayList<T>();
private final List<Runnable> callbacks = new LinkedList<Runnable>();
private int pollingTime = 100;
private ThreadPoolExecutor executor;
private volatile ThreadPoolExecutor executor;
private AtomicBoolean started=new AtomicBoolean();
public Usage(T parent, String name, float portion) {
@ -281,7 +281,7 @@ public abstract class Usage<T extends Usage> implements Service {
}
@SuppressWarnings("unchecked")
public synchronized void start() {
public void start() {
if (started.compareAndSet(false, true)){
if (parent != null) {
parent.addChild(this);
@ -293,7 +293,7 @@ public abstract class Usage<T extends Usage> implements Service {
}
@SuppressWarnings("unchecked")
public synchronized void stop() {
public void stop() {
if (started.compareAndSet(true, false)){
if (parent != null) {
parent.removeChild(this);
@ -400,7 +400,9 @@ public abstract class Usage<T extends Usage> implements Service {
this.parent = parent;
}
protected synchronized Executor getExecutor() {
protected Executor getExecutor() {
if (this.executor == null) {
synchronized(usageMutex) {
if (this.executor == null) {
this.executor = new ThreadPoolExecutor(1, 1, 0,
TimeUnit.NANOSECONDS,
@ -412,7 +414,8 @@ public abstract class Usage<T extends Usage> implements Service {
return thread;
}
});
}
}
}
return this.executor;
}