/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.cloud.topology;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.caucho.management.server.ClusterMXBean;
import com.caucho.util.L10N;
/**
* Defines a set of clustered servers.
*/
public class CloudCluster
{
private static final L10N L = new L10N(CloudCluster.class);
private static final Logger log = Logger.getLogger(CloudCluster.class.getName());
private static final int POD_INDEX_MAX = 64 * 64;
private final CloudSystem _domain;
private final String _id;
private CloudPod []_podList = new CloudPod[0];
private CloudClusterAdmin _admin;
private final CopyOnWriteArrayList<CloudPodListener> _listeners
= new CopyOnWriteArrayList<CloudPodListener>();
private final ConcurrentHashMap<Class<?>,Object> _dataMap
= new ConcurrentHashMap<Class<?>,Object>();
CloudCluster(CloudSystem domain, String id)
{
_domain = domain;
_id = id;
}
/**
* Gets the cluster id.
*/
public String getId()
{
return _id;
}
/**
* Returns the owning domain.
*/
public CloudSystem getSystem()
{
return _domain;
}
/**
* Returns the list of pods for the cluster
*/
public CloudPod []getPodList()
{
return _podList;
}
public ClusterMXBean getAdmin()
{
return _admin;
}
//
// lifecycle
//
void init()
{
}
void start()
{
_admin = new CloudClusterAdmin(this);
_admin.register();
}
void destroy()
{
if (_admin != null)
_admin.unregister();
}
/**
* Finds the first server with the given server-id.
*/
public CloudServer findServer(String id)
{
for (CloudPod pod : _podList) {
CloudServer server = pod.findServer(id);
if (server != null)
return server;
}
return null;
}
/**
* Finds the first server with the given server-id.
*/
public CloudServer findServerByUniqueClusterId(String id)
{
for (CloudPod pod : _podList) {
CloudServer server = pod.findServerByUniqueClusterId(id);
if (server != null)
return server;
}
return null;
}
/**
* Finds the first server with the given server-id.
*/
public CloudServer findServer(int podIndex,
int index)
{
CloudPod pod = findPod(podIndex);
if (pod != null)
return pod.findServer(index);
else
return null;
}
/**
* Returns the pod with the given index.
*/
public CloudPod findPod(int podIndex)
{
CloudPod []podList = _podList;
if (podIndex < podList.length)
return podList[podIndex];
else
return null;
}
/**
* Returns the pod with the given index.
*/
public CloudPod findPod(String id)
{
for (CloudPod pod : _podList) {
if (pod != null && id.equals(pod.getId()))
return pod;
}
return null;
}
/**
* Creates a new pod
*/
public CloudPod createPod()
{
return createPod(-1);
}
/**
* Creates a new pod
*/
public CloudPod createPod(int index)
{
CloudPod pod = null;
synchronized (this) {
if (POD_INDEX_MAX <= index)
throw new IllegalArgumentException(L.l("'{0}' is an invalid pod index because it's greater than the max value.",
index));
if (index > 0 && index < _podList.length && _podList[index] != null) {
throw new IllegalStateException(L.l("'{0}' is an invalid pod index because that pod already exists {1}",
index, _podList[index]));
}
for (int i = 0; i < _podList.length; i++) {
CloudPod oldPod = _podList[i];
if (oldPod == null && index < 0) {
index = i;
}
}
if (index < 0)
index = _podList.length;
pod = new CloudPod(this, null, index);
if (_podList.length <= index) {
CloudPod []podList = new CloudPod[index + 1];
System.arraycopy(_podList, 0, podList, 0, _podList.length);
_podList = podList;
}
_podList[index] = pod;
}
for (CloudPodListener listener : _listeners) {
listener.onPodAdd(pod);
}
if (log.isLoggable(Level.FINEST))
log.finest(this + " added " + pod);
return pod;
}
/**
* Creates a new cluster.
*/
public boolean removePod(int index)
{
if (index < 0 || _podList.length <= index)
return false;
CloudPod pod = null;
synchronized (this) {
pod = _podList[index];
if (pod == null)
return false;
for (CloudServer server : pod.getServerList()) {
if (server != null) {
throw new IllegalStateException(L.l("{0} may not be removed because it has a non-empty server list",
pod));
}
}
// XXX: possibly always make a copy
_podList[index] = null;
int tail = _podList.length - 1;
for (; tail >= 0 && _podList[tail] == null; tail--) {
}
if (tail + 1 < _podList.length) {
CloudPod []podArray = new CloudPod[tail + 1];
System.arraycopy(_podList, 0, podArray, 0, tail + 1);
_podList = podArray;
}
}
for (CloudPodListener listener : _listeners) {
listener.onPodRemove(pod);
}
return true;
}
/**
* Finds the first server with the given server-id.
*/
public CloudServer findServer(String address, int port)
{
for (CloudPod pod : _podList) {
CloudServer server = pod.findServer(address, port);
if (server != null)
return server;
}
return null;
}
//
// data
//
public void putData(Object value)
{
_dataMap.put(value.getClass(), value);
}
@SuppressWarnings("unchecked")
public <T> T putDataIfAbsent(T value)
{
return (T) _dataMap.putIfAbsent(value.getClass(), value);
}
@SuppressWarnings("unchecked")
public <T> T getData(Class<T> cl)
{
return (T) _dataMap.get(cl);
}
//
// listeners
//
/**
* Adds a listener to detect pod add and remove.
*/
public void addPodListener(CloudPodListener listener)
{
if (! _listeners.contains(listener))
_listeners.add(listener);
for (CloudPod pod : getPodList()) {
listener.onPodAdd(pod);
}
}
/**
* Removes a listener to detect pod add and remove.
*/
public void removePodListener(CloudPodListener listener)
{
_listeners.remove(listener);
}
@Override
public String toString()
{
return getClass().getSimpleName() + "[" + _id + "]";
}
}