juzu.impl.inject.ScopedContext Maven / Gradle / Ivy
/*
* Copyright 2013 eXo Platform SAS
*
* 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 juzu.impl.inject;
import juzu.impl.common.Logger;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
/**
* An helper class for managing scoped entries. It implements the {@link HttpSessionBindingListener} interface
* which invokes the {@link #close()} method when the servlet container invokes the {@link
* #valueUnbound(javax.servlet.http.HttpSessionBindingEvent)} callback. At the moment we do not support
* serialization.
*
* @author Julien Viet
*/
public final class ScopedContext implements HttpSessionBindingListener, Iterable {
/** . */
private HashMap state;
/** . */
private final Logger log;
public ScopedContext(Logger log) {
this.log = log;
}
public Scoped get(Object key) throws NullPointerException {
if (key == null) {
throw new NullPointerException("No null key accepted");
}
return state != null ? state.get(key) : null;
}
public void set(Object key, Scoped scoped) throws NullPointerException {
if (key == null) {
throw new NullPointerException("No null key accepted");
}
if (scoped == null) {
if (state != null) {
state.remove(key);
}
}
else {
if (state == null) {
state = new HashMap();
}
state.put(key, scoped);
}
}
public int size() {
return state != null ? state.size() : 0;
}
public Iterator iterator() {
return state == null ? Collections.emptyList().iterator() : state.values().iterator();
}
public void valueBound(HttpSessionBindingEvent event) {
// Nothing to do
}
public void valueUnbound(HttpSessionBindingEvent event) {
close();
}
public void close() {
if (state != null && state.size() > 0) {
for (Iterator i = state.values().iterator();i.hasNext();) {
Scoped scoped = i.next();
i.remove();
try {
scoped.destroy();
}
catch (Throwable t) {
log.log("Error when destroying object", t);
}
}
}
}
}