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FELIX-6784 Reduce number of thread (re)creations of the Configurator Worker Thread #427

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FELIX-6784 Reduce number of thread (re)creations of the Configurator Worker Thread #427

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8 changes: 4 additions & 4 deletions configurator/src/main/java/org/apache/felix/configurator/impl/Configurator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,7 @@ public Bundle addingBundle(final Bundle bundle, final BundleEvent event) {
if ( active &&
(state == Bundle.ACTIVE || state == Bundle.STARTING) ) {
SystemLogger.debug("Adding bundle " + getBundleIdentity(bundle) + " : " + getBundleState(state));
queue.enqueue(new Runnable() {
queue.submit(new Runnable() {

@Override
public void run() {
Expand All @@ -128,7 +128,7 @@ public void removedBundle(final Bundle bundle, final BundleEvent event, final Bu
final int state = bundle.getState();
if ( active && state == Bundle.UNINSTALLED ) {
SystemLogger.debug("Removing bundle " + getBundleIdentity(bundle) + " : " + getBundleState(state));
queue.enqueue(new Runnable() {
queue.submit(new Runnable() {

@Override
public void run() {
Expand All @@ -148,7 +148,7 @@ public void run() {
}

public void configAdminAdded() {
queue.enqueue(new Runnable() {
queue.submit(new Runnable() {

@Override
public void run() {
Expand Down Expand Up @@ -182,7 +182,7 @@ private String getBundleState(int state) {
*/
public void shutdown() {
this.active = false;
this.queue.stop();
this.queue.shutdownNow();
this.tracker.close();
}

Expand Down
69 changes: 17 additions & 52 deletions configurator/src/main/java/org/apache/felix/configurator/impl/WorkerQueue.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,67 +18,32 @@
*/
package org.apache.felix.configurator.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;

import org.apache.felix.configurator.impl.logger.SystemLogger;

public class WorkerQueue implements Runnable {

private final ThreadFactory threadFactory;

private final List<Runnable> tasks = new ArrayList<>();

private volatile Thread backgroundThread;

private volatile boolean stopped = false;
public class WorkerQueue extends ScheduledThreadPoolExecutor {

public WorkerQueue() {
this.threadFactory = Executors.defaultThreadFactory();
}

public void stop() {
synchronized ( this.tasks ) {
this.stopped = true;
}
}

public void enqueue(final Runnable r) {
synchronized ( this.tasks ) {
if ( !this.stopped ) {
this.tasks.add(r);
if ( this.backgroundThread == null ) {
this.backgroundThread = this.threadFactory.newThread(this);
this.backgroundThread.setDaemon(true);
this.backgroundThread.setName("Apache Felix Configurator Worker Thread");
this.backgroundThread.start();
}
super(1, new ThreadFactory() {
@Override
public Thread newThread(Runnable runnable) {
Thread thread = new Thread(runnable);
thread.setDaemon(true);
thread.setName("Apache Felix Configurator Worker Thread");
return thread;
}
}
});
setKeepAliveTime(5, TimeUnit.SECONDS);
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@glimmerveen glimmerveen May 26, 2025

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This could be made configurable, but my initial proposal is to have a static, relatively short, keep alive time fixed in the code. Its purpose is mainly to let the underlying thread terminate at some point if no tasks are queued.

allowCoreThreadTimeOut(true);
}

@Override
public void run() {
Runnable r;
do {
r = null;
synchronized ( this.tasks ) {
if ( !this.stopped && !this.tasks.isEmpty() ) {
r = this.tasks.remove(0);
} else {
this.backgroundThread = null;
}
}
if ( r != null ) {
try {
r.run();
} catch ( final Throwable t) {
// just to be sure our loop never dies
SystemLogger.error("Error processing task" + t.getMessage(), t);
}
}
} while ( r != null );
protected void afterExecute(Runnable runnable, Throwable throwable) {
if (throwable != null) {
SystemLogger.error("Error processing task" + throwable.getMessage(), throwable);
}
}
}