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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.openapi.util;
import com.intellij.util.SmartList;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
class ExecutionCallback {
private int myCurrentCount;
private final int myCountToExecution;
private List<Runnable> myRunnables;
ExecutionCallback() {
this(1);
}
ExecutionCallback(int executedCount) {
myCountToExecution = executedCount;
assert executedCount >= 1 : executedCount;
}
/**
* @return true if was executed, false if specified executed count is not yet done
*/
boolean setExecuted() {
if (!signalExecution()) {
return false;
}
List<Runnable> all;
synchronized (this) {
if (myRunnables == null) {
return true;
}
else {
all = myRunnables;
myRunnables = null;
}
}
for (Runnable each : all) {
each.run();
}
return true;
}
private static class CompositeRunnable extends ArrayList<Runnable> implements Runnable {
private CompositeRunnable(@NotNull Collection<? extends Runnable> c) {
super(c);
}
@Override
public void run() {
for (Runnable runnable : this) {
runnable.run();
}
}
}
final void doWhenExecuted(@NotNull final Runnable runnable) {
Runnable toRun;
synchronized (this) {
if (isExecuted()) {
if (myRunnables == null) {
toRun = runnable;
}
else {
CompositeRunnable composite = new CompositeRunnable(myRunnables);
composite.add(runnable);
toRun = composite;
myRunnables = null;
}
}
else {
if (myRunnables == null) {
myRunnables = new SmartList<Runnable>();
}
myRunnables.add(runnable);
return;
}
}
toRun.run();
}
/**
* Avoid memory leak in case: myDone executed but myRejected still keep doWhenRejected listeners (and vice versa)
*/
synchronized void clear() {
myRunnables = null;
}
private synchronized boolean signalExecution() {
return ++myCurrentCount >= myCountToExecution;
}
synchronized boolean isExecuted() {
return myCurrentCount >= myCountToExecution;
}
@NonNls
@Override
public synchronized String toString() {
return "current=" + myCurrentCount + " countToExecution=" + myCountToExecution;
}
}
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