/*
* ModeShape (http://www.modeshape.org)
*
* 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 org.modeshape.common.collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.modeshape.common.annotation.ThreadSafe;
/**
* A thread-safe {@link Problems} collection. The problems will be {@link #iterator() returned} in the order in which they were
* encountered.
*/
@ThreadSafe
public class ThreadSafeProblems extends AbstractProblems {
private static final long serialVersionUID = 1L;
private final ReadWriteLock lock = new ReentrantReadWriteLock();
private final List<Problem> problems = new LinkedList<Problem>();
@Override
public boolean hasErrors() {
try {
lock.readLock().lock();
return super.hasErrors();
} finally {
lock.readLock().unlock();
}
}
@Override
public boolean hasProblems() {
try {
lock.readLock().lock();
return super.hasProblems();
} finally {
lock.readLock().unlock();
}
}
@Override
public boolean hasInfo() {
try {
lock.readLock().lock();
return super.hasInfo();
} finally {
lock.readLock().unlock();
}
}
@Override
public boolean hasWarnings() {
try {
lock.readLock().lock();
return super.hasWarnings();
} finally {
lock.readLock().unlock();
}
}
@Override
public boolean isEmpty() {
try {
lock.readLock().lock();
return super.isEmpty();
} finally {
lock.readLock().unlock();
}
}
@Override
public int size() {
try {
lock.readLock().lock();
return super.size();
} finally {
lock.readLock().unlock();
}
}
@Override
protected void addProblem( Problem problem ) {
try {
lock.writeLock().lock();
problems.add(problem);
} finally {
lock.writeLock().unlock();
}
}
@Override
public void addAll( Iterable<Problem> problems ) {
if (problems == this) return;
try {
lock.writeLock().lock();
if (problems != null) {
for (Problem problem : problems) {
this.problems.add(problem);
}
}
} finally {
lock.writeLock().unlock();
}
}
@Override
protected List<Problem> getProblems() {
// Return an unmodifiable copy ...
try {
lock.readLock().lock();
return Collections.unmodifiableList(new ArrayList<Problem>(this.problems));
} finally {
lock.readLock().unlock();
}
}
}