org.ldp4j.application.ContextWriteSessionState Maven / Gradle / Ivy
The newest version!
/**
* #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
* This file is part of the LDP4j Project:
* http://www.ldp4j.org/
*
* Center for Open Middleware
* http://www.centeropenmiddleware.com/
* #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
* Copyright (C) 2014-2016 Center for Open Middleware.
* #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
* 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.
* #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
* Artifact : org.ldp4j.framework:ldp4j-application-api:0.2.2
* Bundle : ldp4j-application-api-0.2.2.jar
* #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
*/
package org.ldp4j.application;
import static com.google.common.base.Preconditions.checkState;
import java.util.concurrent.atomic.AtomicLong;
import org.ldp4j.application.data.Individual;
import org.ldp4j.application.data.Name;
import org.ldp4j.application.ext.ResourceHandler;
import org.ldp4j.application.session.ResourceSnapshot;
import org.ldp4j.application.session.SessionTerminationException;
import org.ldp4j.application.session.WriteSession;
import org.ldp4j.application.session.WriteSessionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
final class ContextWriteSessionState implements WriteSession {
private static final Logger LOGGER=LoggerFactory.getLogger(ApplicationContext.class);
private static final AtomicLong SESSION_COUNTER=new AtomicLong();
private final long id;
private final WriteSession delegate;
private final ContextWriteSessionStateListener listener;
private boolean disposed;
private boolean completed;
ContextWriteSessionState(WriteSession delegate, ContextWriteSessionStateListener listener) {
this.delegate = delegate;
this.listener = listener;
this.id=SESSION_COUNTER.incrementAndGet();
}
private void doDispose() throws SessionTerminationException {
this.listener.onDispose(this);
this.disposed=true;
this.delegate.close();
}
private void verifyExecutability() {
checkState(!this.disposed,"Session has already been disposed");
checkState(!this.completed,"Session has already been completed");
}
long id() {
return this.id;
}
synchronized void dispose() {
LOGGER.warn("Closing session {} which was not closed by the user...",this);
try {
doDispose();
} catch (SessionTerminationException e) {
LOGGER.error("Could not close session {}",this,e);
}
}
/**
* {@inheritDoc}
*/
@Override
public synchronized S resolve(Class snapshotClass, Individual individual) {
verifyExecutability();
return this.delegate.resolve(snapshotClass,individual);
}
/**
* {@inheritDoc}
*/
@Override
public synchronized S find(Class snapshotClass, Name id, Class handlerClass) {
verifyExecutability();
return this.delegate.find(snapshotClass,id,handlerClass);
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void modify(ResourceSnapshot resource) {
verifyExecutability();
this.delegate.modify(resource);
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void delete(ResourceSnapshot resource) {
verifyExecutability();
this.delegate.delete(resource);
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void saveChanges() throws WriteSessionException {
verifyExecutability();
this.delegate.saveChanges();
this.completed=true;
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void discardChanges() throws WriteSessionException {
verifyExecutability();
this.delegate.discardChanges();
this.completed=true;
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void close() throws SessionTerminationException {
if(this.disposed) {
return;
}
doDispose();
}
/**
* {@inheritDoc}
*/
@Override
public synchronized String toString() {
return
MoreObjects.
toStringHelper(getClass()).
add("id",this.id).
add("completed",this.completed).
add("disposed",this.disposed).
add("delegate",this.delegate).
toString();
}
}