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/*******************************************************************************
* Copyright (c) 2012 Wind River Systems 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.debug.test.util;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
/**
*
*/
public abstract class TransactionCache<V> extends Transaction<V> implements ICache<V> {
private List<ICache<?>> fDependsOn;
private List<Callback> fDependsOnCallbacks;
private CallbackCache<V> fCache = new CallbackCache<V>() {
@Override
protected void retrieve(DataCallback<V> rm) {
request(rm);
}
};
public V getData() {
return fCache.getData();
}
public Throwable getError() {
return fCache.getError();
}
public void update(Callback rm) {
fCache.update(rm);
}
public boolean isValid() {
return fCache.isValid();
}
@Override
protected void preProcess() {
super.preProcess();
if (fDependsOnCallbacks != null) {
for (Callback cb : fDependsOnCallbacks) {
cb.cancel();
}
fDependsOnCallbacks = null;
}
fDependsOn = new ArrayList<ICache<?>>(4);
}
protected void postProcess(boolean done, V data, Throwable error) {
if (done) {
fDependsOnCallbacks = new ArrayList<Callback>(fDependsOn.size());
for (ICache<?> cache : fDependsOn) {
assert cache.isValid();
cache.update(new Callback() {
@Override
protected void handleCompleted() {
if (!isCancelled()) {
fCache.reset();
for (Callback cb : fDependsOnCallbacks) {
if (cb == this) continue;
cb.cancel();
}
}
}
});
}
} else {
fDependsOn = null;
}
super.postProcess(done, data, error);
}
/**
* Can be called while in {@link #process()}
* @param cache
*/
public void addDependsOn(ICache cache) {
fDependsOn.add(cache);
}
public <T> T validate(ICache<T> cache) throws InvalidCacheException, ExecutionException {
if (cache.isValid()) {
addDependsOn(cache);
}
return super.validate(cache);
}
@Override
public void validate(Iterable caches) throws InvalidCacheException, ExecutionException {
for (Object cacheObj : caches) {
ICache<?> cache = (ICache<?>)cacheObj;
if (cache.isValid()) {
addDependsOn(cache);
}
}
super.validate(caches);
}
}
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