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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext;
/**
* Scheduling rule factory for asycn operations.
*
* @since 3.2
*/
public class AsynchronousSchedulingRuleFactory {
private static AsynchronousSchedulingRuleFactory fgFactory = null;
/**
* Rule allows only one job to run at a time
*/
class SerialRule implements ISchedulingRule {
public SerialRule() {
}
public boolean contains(ISchedulingRule rule) {
return rule == this;
}
public boolean isConflicting(ISchedulingRule rule) {
return rule instanceof SerialRule;
}
}
class SerialPerObjectRule implements ISchedulingRule {
private Object fObject = null;
public SerialPerObjectRule(Object lock) {
fObject = lock;
}
/* (non-Javadoc)
* @see org.eclipse.core.runtime.jobs.ISchedulingRule#contains(org.eclipse.core.runtime.jobs.ISchedulingRule)
*/
public boolean contains(ISchedulingRule rule) {
return rule == this;
}
/* (non-Javadoc)
* @see org.eclipse.core.runtime.jobs.ISchedulingRule#isConflicting(org.eclipse.core.runtime.jobs.ISchedulingRule)
*/
public boolean isConflicting(ISchedulingRule rule) {
if (rule instanceof SerialPerObjectRule) {
SerialPerObjectRule vup = (SerialPerObjectRule) rule;
return fObject == vup.fObject;
}
return false;
}
}
private AsynchronousSchedulingRuleFactory() {}
public static AsynchronousSchedulingRuleFactory getDefault() {
if (fgFactory == null) {
fgFactory = new AsynchronousSchedulingRuleFactory();
}
return fgFactory;
}
/**
* Returns a scheulding rule that allows all jobs with an instance
* of the rule to run one at a time.
*
* @return scheduling rule
*/
public ISchedulingRule newSerialRule() {
return new SerialRule();
}
/**
* Returns a scheduling rule that allows all jobs with an instance
* of the rule on the same object to run one at a time.
*
* @param lock object to serialize one
* @return scheduling rule
*/
public ISchedulingRule newSerialPerObjectRule(Object lock) {
return new SerialPerObjectRule(lock);
}
/**
* Returns a scheduling rule that allows all jobs with an instance of
* the rule to run one at a time per part associated with the given
* presentation context.
*
* @param context presentation context
* @return scheduling rule
*/
public ISchedulingRule newSerialPerPartRule(IPresentationContext context) {
return newSerialPerObjectRule(context.getPart());
}
}
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