/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.servlet.core;
import java.util.EventListener;
import javax.servlet.ServletException;
import io.undertow.servlet.UndertowServletMessages;
import io.undertow.servlet.api.InstanceHandle;
import io.undertow.servlet.api.ListenerInfo;
Author: Stuart Douglas
/**
* @author Stuart Douglas
*/
public class ManagedListener implements Lifecycle {
private final ListenerInfo listenerInfo;
private final boolean programatic;
private volatile boolean started = false;
private volatile InstanceHandle<? extends EventListener> handle;
public ManagedListener(final ListenerInfo listenerInfo, final boolean programatic) {
this.listenerInfo = listenerInfo;
this.programatic = programatic;
}
public synchronized void start() throws ServletException {
if (!started) {
try {
handle = listenerInfo.getInstanceFactory().createInstance();
} catch (Exception e) {
throw UndertowServletMessages.MESSAGES.couldNotInstantiateComponent(listenerInfo.getListenerClass().getName(), e);
}
started = true;
}
}
public synchronized void stop() {
started = false;
if (handle != null) {
handle.release();
}
}
public ListenerInfo getListenerInfo() {
return listenerInfo;
}
@Override
public boolean isStarted() {
return started;
}
public EventListener instance() {
if (!started) {
throw UndertowServletMessages.MESSAGES.listenerIsNotStarted();
}
return handle.getInstance();
}
public boolean isProgramatic() {
return programatic;
}
@Override
public String toString() {
return "ManagedListener{" +
"listenerInfo=" + listenerInfo +
'}';
}
}