/*
* 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.catalina.ha.context;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import javax.servlet.ServletContext;
import org.apache.catalina.Globals;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Loader;
import org.apache.catalina.core.ApplicationContext;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.ha.CatalinaCluster;
import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.tipis.AbstractReplicatedMap.MapOwner;
import org.apache.catalina.tribes.tipis.ReplicatedMap;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* @author Filip Hanik
* @version 1.0
*/
public class ReplicatedContext extends StandardContext implements MapOwner {
private int mapSendOptions = Channel.SEND_OPTIONS_DEFAULT;
private static final Log log = LogFactory.getLog( ReplicatedContext.class );
protected static long DEFAULT_REPL_TIMEOUT = 15000;//15 seconds
/**
* Start this component and implement the requirements
* of {@link org.apache.catalina.util.LifecycleBase#startInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void startInternal() throws LifecycleException {
super.startInternal();
try {
CatalinaCluster catclust = (CatalinaCluster)this.getCluster();
if ( catclust != null ) {
ReplicatedMap<String,Object> map =
new ReplicatedMap<String,Object>(this,
catclust.getChannel(),DEFAULT_REPL_TIMEOUT,
getName(),getClassLoaders());
map.setChannelSendOptions(mapSendOptions);
((ReplApplContext)this.context).setAttributeMap(map);
}
} catch ( Exception x ) {
log.error("Unable to start ReplicatedContext",x);
throw new LifecycleException("Failed to start ReplicatedContext",x);
}
}
/**
* Stop this component and implement the requirements
* of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void stopInternal() throws LifecycleException {
Map<String, Object> map = ((ReplApplContext) this.context)
.getAttributeMap();
super.stopInternal();
if ( map!=null && map instanceof ReplicatedMap) {
((ReplicatedMap<?, ?>) map).breakdown();
}
}
public void setMapSendOptions(int mapSendOptions) {
this.mapSendOptions = mapSendOptions;
}
public int getMapSendOptions() {
return mapSendOptions;
}
public ClassLoader[] getClassLoaders() {
Loader loader = null;
ClassLoader classLoader = null;
loader = this.getLoader();
if (loader != null) classLoader = loader.getClassLoader();
if ( classLoader == null ) classLoader = Thread.currentThread().getContextClassLoader();
if ( classLoader == Thread.currentThread().getContextClassLoader() ) {
return new ClassLoader[] {classLoader};
} else {
return new ClassLoader[] {classLoader,Thread.currentThread().getContextClassLoader()};
}
}
@Override
public ServletContext getServletContext() {
if (context == null) {
context = new ReplApplContext(this);
if (getAltDDName() != null)
context.setAttribute(Globals.ALT_DD_ATTR,getAltDDName());
}
return ((ReplApplContext)context).getFacade();
}
protected static class ReplApplContext extends ApplicationContext {
protected final Map<String, Object> tomcatAttributes =
new ConcurrentHashMap<String, Object>();
public ReplApplContext(ReplicatedContext context) {
super(context);
}
protected ReplicatedContext getParent() {
return (ReplicatedContext)getContext();
}
@Override
protected ServletContext getFacade() {
return super.getFacade();
}
public Map<String,Object> getAttributeMap() {
return this.attributes;
}
public void setAttributeMap(Map<String,Object> map) {
this.attributes = map;
}
@Override
public void removeAttribute(String name) {
tomcatAttributes.remove(name);
//do nothing
super.removeAttribute(name);
}
@Override
public void setAttribute(String name, Object value) {
if (name == null) {
throw new IllegalArgumentException(sm.getString("applicationContext.setAttribute.namenull"));
}
if (value == null) {
removeAttribute(name);
return;
}
if ( (!getParent().getState().isAvailable()) || "org.apache.jasper.runtime.JspApplicationContextImpl".equals(name) ){
tomcatAttributes.put(name,value);
} else
super.setAttribute(name,value);
}
@Override
public Object getAttribute(String name) {
Object obj = tomcatAttributes.get(name);
if (obj == null) {
return super.getAttribute(name);
} else {
return obj;
}
}
@SuppressWarnings("unchecked")
@Override
public Enumeration<String> getAttributeNames() {
Set<String> names = new HashSet<String>();
names.addAll(attributes.keySet());
return new MultiEnumeration<String>(new Enumeration[] {
super.getAttributeNames(),
Collections.enumeration(names) });
}
}
protected static class MultiEnumeration<T> implements Enumeration<T> {
Enumeration<T>[] e=null;
public MultiEnumeration(Enumeration<T>[] lists) {
e = lists;
}
@Override
public boolean hasMoreElements() {
for ( int i=0; i<e.length; i++ ) {
if ( e[i].hasMoreElements() ) return true;
}
return false;
}
@Override
public T nextElement() {
for ( int i=0; i<e.length; i++ ) {
if ( e[i].hasMoreElements() ) return e[i].nextElement();
}
return null;
}
}
@Override
public void objectMadePrimay(Object key, Object value) {
//noop
}
}