/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.deltaspike.core.impl.lock;
import org.apache.deltaspike.core.api.lock.Locked;
import org.apache.deltaspike.core.impl.util.AnnotatedMethods;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Typed;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import javax.interceptor.InvocationContext;
import java.lang.reflect.Method;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import static org.apache.deltaspike.core.api.lock.Locked.Operation.READ;
@ApplicationScoped
@Typed(LockSupplierStorage.class)
public class LockSupplierStorage implements Locked.LockFactory
{
private final ConcurrentMap<String, ReadWriteLock> locks = new ConcurrentHashMap<String, ReadWriteLock>();
// read or write
private final ConcurrentMap<Method, LockSupplier> lockSuppliers = new ConcurrentHashMap<Method, LockSupplier>();
@Inject
private BeanManager beanManager;
protected LockSupplier getLockSupplier(final InvocationContext ic)
{
final Method key = ic.getMethod();
LockSupplier operation = lockSuppliers.get(key);
if (operation == null)
{
final Class declaringClass = key.getDeclaringClass();
final AnnotatedType<Object> annotatedType = beanManager.createAnnotatedType(declaringClass);
final AnnotatedMethod<?> annotatedMethod = AnnotatedMethods.findMethod(annotatedType, key);
Locked config = annotatedMethod.getAnnotation(Locked.class);
if (config == null)
{
config = annotatedType.getAnnotation(Locked.class);
}
final Locked.LockFactory factory = config.factory() != Locked.LockFactory.class ?
Locked.LockFactory.class.cast(
beanManager.getReference(beanManager.resolve(
beanManager.getBeans(
config.factory())),
Locked.LockFactory.class, null)) : this;
final ReadWriteLock writeLock = factory.newLock(annotatedMethod, config.fair());
final long timeout = config.timeoutUnit().toMillis(config.timeout());
final Lock lock = config.operation() == READ ? writeLock.readLock() : writeLock.writeLock();
if (timeout > 0)
{
operation = new LockSupplier()
{
@Override
public Lock get()
{
try
{
if (!lock.tryLock(timeout, TimeUnit.MILLISECONDS))
{
throw new IllegalStateException("Can't lock for " + key + " in " + timeout + "ms");
}
}
catch (final InterruptedException e)
{
Thread.interrupted();
throw new IllegalStateException("Locking interrupted", e);
}
return lock;
}
};
}
else
{
operation = new LockSupplier()
{
@Override
public Lock get()
{
lock.lock();
return lock;
}
};
}
final LockSupplier existing = lockSuppliers.putIfAbsent(key, operation);
if (existing != null)
{
operation = existing;
}
}
return operation;
}
@Override
public ReadWriteLock newLock(final AnnotatedMethod<?> method, final boolean fair)
{
final String name = method.getJavaMember().getDeclaringClass().getName();
ReadWriteLock lock = locks.get(name);
if (lock == null)
{
lock = new ReentrantReadWriteLock(fair);
final ReadWriteLock existing = locks.putIfAbsent(name, lock);
if (existing != null)
{
lock = existing;
}
}
return lock;
}
}