Author: kkolinko
Date: Mon Dec 13 02:09:32 2010
New Revision: 1045003
URL: http://svn.apache.org/viewvc?rev=1045003&view=rev
Log:
Improve the fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=50201
- Use AtomicReference to guard against possible duplicate registration of
listeners when logAccess() is called by several threads at the same time.
- Added install() and uninstall() method to AccessLogListener
to help register/unregister the listeners.
- When defaultAccessLog is nulled, always unregister the listener as well.
The listener does not need to be reused, because now we do create a listener
when there is no log and it will take care of things.
Modified:
tomcat/trunk/java/org/apache/catalina/core/StandardEngine.java
tomcat/trunk/webapps/docs/changelog.xml
Modified: tomcat/trunk/java/org/apache/catalina/core/StandardEngine.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/core/StandardEngine.java?rev=1045003&r1=1045002&r2=1045003&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/core/StandardEngine.java (original)
+++ tomcat/trunk/java/org/apache/catalina/core/StandardEngine.java Mon Dec 13
02:09:32 2010
@@ -19,6 +19,7 @@ package org.apache.catalina.core;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Locale;
+import java.util.concurrent.atomic.AtomicReference;
import org.apache.catalina.AccessLog;
import org.apache.catalina.Container;
@@ -115,7 +116,8 @@ public class StandardEngine extends Cont
* Default access log to use for request/response pairs where we can't ID
* the intended host and context.
*/
- private volatile AccessLog defaultAccessLog;
+ private final AtomicReference<AccessLog> defaultAccessLog =
+ new AtomicReference<AccessLog>();
// ------------------------------------------------------------- Properties
@@ -321,7 +323,7 @@ public class StandardEngine extends Cont
}
if (!logged && useDefault) {
- AccessLog newDefaultAccessLog = defaultAccessLog;
+ AccessLog newDefaultAccessLog = defaultAccessLog.get();
if (newDefaultAccessLog == null) {
// If we reached this point, this Engine can't have an
AccessLog
// Look in the defaultHost
@@ -331,22 +333,25 @@ public class StandardEngine extends Cont
newDefaultAccessLog = host.getAccessLog();
if (newDefaultAccessLog != null) {
- AccessLogListener l = new AccessLogListener(this);
- this.addPropertyChangeListener(l);
- host.addContainerListener(l);
- host.addLifecycleListener(l);
+ if (defaultAccessLog.compareAndSet(null,
+ newDefaultAccessLog)) {
+ AccessLogListener l = new AccessLogListener(this,
+ host, null);
+ l.install();
+ }
} else {
// Try the ROOT context of default host
context = (Context) host.findChild("");
if (context != null &&
context.getState().isAvailable()) {
newDefaultAccessLog = context.getAccessLog();
-
if (newDefaultAccessLog != null) {
- AccessLogListener l =
- new AccessLogListener(this);
- this.addPropertyChangeListener(l);
- context.addLifecycleListener(l);
+ if (defaultAccessLog.compareAndSet(null,
+ newDefaultAccessLog)) {
+ AccessLogListener l = new
AccessLogListener(
+ this, null, context);
+ l.install();
+ }
}
}
}
@@ -354,18 +359,13 @@ public class StandardEngine extends Cont
if (newDefaultAccessLog == null) {
newDefaultAccessLog = new NoopAccessLog();
- AccessLogListener l = new AccessLogListener(this);
- this.addPropertyChangeListener(l);
- if (host != null) {
- host.addContainerListener(l);
- host.addLifecycleListener(l);
- }
- if (context != null) {
- context.addLifecycleListener(l);
+ if (defaultAccessLog.compareAndSet(null,
+ newDefaultAccessLog)) {
+ AccessLogListener l = new AccessLogListener(this, host,
+ context);
+ l.install();
}
-
}
- defaultAccessLog = newDefaultAccessLog;
}
newDefaultAccessLog.log(request, response, time);
@@ -407,29 +407,53 @@ public class StandardEngine extends Cont
ContainerListener {
private StandardEngine engine;
+ private Host host;
+ private Context context;
private volatile boolean disabled = false;
- public AccessLogListener(StandardEngine engine) {
+ public AccessLogListener(StandardEngine engine, Host host,
+ Context context) {
this.engine = engine;
+ this.host = host;
+ this.context = context;
+ }
+
+ public void install() {
+ engine.addPropertyChangeListener(this);
+ if (host != null) {
+ host.addContainerListener(this);
+ host.addLifecycleListener(this);
+ }
+ if (context != null) {
+ context.addLifecycleListener(this);
+ }
+ }
+
+ private void uninstall() {
+ disabled = true;
+ if (context != null) {
+ context.removeLifecycleListener(this);
+ }
+ if (host != null) {
+ host.removeLifecycleListener(this);
+ host.removeContainerListener(this);
+ }
+ engine.removePropertyChangeListener(this);
}
@Override
public void lifecycleEvent(LifecycleEvent event) {
if (disabled) return;
-
+
String type = event.getType();
if (Lifecycle.AFTER_START_EVENT.equals(type) ||
- Lifecycle.BEFORE_STOP_EVENT.equals(type)) {
- // Container is being started/stopped
- // Force re-calculation but do not disable listener since it
- // might be re-used
- engine.defaultAccessLog = null;
- } else if (Lifecycle.BEFORE_DESTROY_EVENT.equals(type)) {
- // Container is being removed
+ Lifecycle.BEFORE_STOP_EVENT.equals(type) ||
+ Lifecycle.BEFORE_DESTROY_EVENT.equals(type)) {
+ // Container is being started/stopped/removed
// Force re-calculation and disable listener since it won't
// be re-used
- engine.defaultAccessLog = null;
- disabled = true;
+ engine.defaultAccessLog.set(null);
+ uninstall();
}
}
@@ -439,8 +463,8 @@ public class StandardEngine extends Cont
if ("defaultHost".equals(evt.getPropertyName())) {
// Force re-calculation and disable listener since it won't
// be re-used
- engine.defaultAccessLog = null;
- disabled = true;
+ engine.defaultAccessLog.set(null);
+ uninstall();
}
}
@@ -448,13 +472,13 @@ public class StandardEngine extends Cont
public void containerEvent(ContainerEvent event) {
// Only useful for hosts
if (disabled) return;
-
if (Container.ADD_CHILD_EVENT.equals(event.getType())) {
Context context = (Context) event.getData();
if ("".equals(context.getPath())) {
- // New ROOT context in default host
- // Force recalculation of default access log
- engine.defaultAccessLog = null;
+ // Force re-calculation and disable listener since it won't
+ // be re-used
+ engine.defaultAccessLog.set(null);
+ uninstall();
}
}
}
Modified: tomcat/trunk/webapps/docs/changelog.xml
URL:
http://svn.apache.org/viewvc/tomcat/trunk/webapps/docs/changelog.xml?rev=1045003&r1=1045002&r2=1045003&view=diff
==============================================================================
--- tomcat/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/trunk/webapps/docs/changelog.xml Mon Dec 13 02:09:32 2010
@@ -81,6 +81,11 @@
options to control the <code>SecureRandom</code> instances used to
generate session IDs. (markt)
</update>
+ <fix>
+ <bug>50201</bug>: Update the access log reference in
+ <code>StandardEngine</code> when the ROOT web application is
redeployed,
+ started, stopped or defaultHost is changed. (markt/kkolinko)
+ </fix>
<add>
<bug>50282</bug>: Load
<code>javax.security.auth.login.Configuration</code> with
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