/* *******************************************************************
* Copyright (c) 2004 IBM Corporation
*
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Common Public License v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* Andy Clement initial implementation
* ******************************************************************/
package org.aspectj.runtime.internal;
import org.aspectj.runtime.internal.cflowstack.ThreadCounter;
import org.aspectj.runtime.internal.cflowstack.ThreadStackFactory;
import org.aspectj.runtime.internal.cflowstack.ThreadStackFactoryImpl;
import org.aspectj.runtime.internal.cflowstack.ThreadStackFactoryImpl11;
public class CFlowCounter {
private static ThreadStackFactory tsFactory;
private ThreadCounter flowHeightHandler;
static {
selectFactoryForVMVersion();
}
public CFlowCounter() {
flowHeightHandler = tsFactory.getNewThreadCounter();
}
public void inc() {
flowHeightHandler.inc();
}
public void dec() {
flowHeightHandler.dec();
}
public boolean isValid() {
return flowHeightHandler.isNotZero();
}
private static ThreadStackFactory getThreadLocalStackFactory() { return new ThreadStackFactoryImpl(); }
private static ThreadStackFactory getThreadLocalStackFactoryFor11() { return new ThreadStackFactoryImpl11(); }
private static void selectFactoryForVMVersion() {
String override = getSystemPropertyWithoutSecurityException("aspectj.runtime.cflowstack.usethreadlocal","unspecified");
boolean useThreadLocalImplementation = false;
if (override.equals("unspecified")) {
String v = System.getProperty("java.class.version","0.0");
// Java 1.2 is version 46.0 and above
useThreadLocalImplementation = (v.compareTo("46.0") >= 0);
} else {
useThreadLocalImplementation = override.equals("yes") || override.equals("true");
}
// System.err.println("Trying to use thread local implementation? "+useThreadLocalImplementation);
if (useThreadLocalImplementation) {
tsFactory = getThreadLocalStackFactory();
} else {
tsFactory = getThreadLocalStackFactoryFor11();
}
}
private static String getSystemPropertyWithoutSecurityException (String aPropertyName, String aDefaultValue) {
try {
return System.getProperty(aPropertyName, aDefaultValue);
}
catch (SecurityException ex) {
return aDefaultValue;
}
}
// For debug ...
public static String getThreadStackFactoryClassName() {
return tsFactory.getClass().getName();
}
}