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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.internal.cache.tier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.net.SocketCreator;
import org.apache.logging.log4j.Logger;
import org.apache.geode.CancelException;
import org.apache.geode.SystemFailure;
import org.apache.geode.cache.CacheFactory;
import org.apache.geode.cache.client.PoolManager;
import org.apache.geode.cache.client.internal.PoolImpl;
import org.apache.geode.distributed.DistributedMember;
import org.apache.geode.distributed.DistributedSystemDisconnectedException;
import org.apache.geode.distributed.internal.InternalDistributedSystem;
import org.apache.geode.distributed.internal.ServerLocation;
import org.apache.geode.internal.cache.CacheServerImpl;
import org.apache.geode.internal.cache.GemFireCacheImpl;
import org.apache.geode.internal.cache.tier.sockets.AcceptorImpl;
import org.apache.geode.internal.cache.tier.sockets.ClientHealthMonitor;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.internal.logging.LoggingThreadGroup;
import org.apache.geode.internal.logging.log4j.LocalizedMessage;
import org.apache.geode.management.membership.ClientMembershipEvent;
import org.apache.geode.management.membership.ClientMembershipListener;
/**
* Handles registration and event notification duties for ClientMembershipListeners.
* The public counterpart for this class is
* {@link org.apache.geode.management.membership.ClientMembership}.
*
* @since GemFire 4.2.1
*/
public final class InternalClientMembership {
private static final Logger logger = LogService.getLogger();
/**
* The membership listeners registered on this InternalClientMembership
*
* This list is never modified in place, and a new list is installed only under the control of
* (@link #membershipLock}.
*/
private static volatile List clientMembershipListeners =
Collections.emptyList();
/**
* Must be locked whenever references to the volatile field {@link #clientMembershipListeners} is
* changed.
*/
private static final Object membershipLock = new Object();
/**
* QueuedExecutor for firing ClientMembershipEvents
*
* Access synchronized via {@link #systems}
*/
private static ThreadPoolExecutor executor;
private static final ThreadGroup threadGroup =
LoggingThreadGroup.createThreadGroup("ClientMembership Event Invoker Group", logger);
/** List of connected DistributedSystems */
private static final List systems = new ArrayList(1);
/**
* True if class is monitoring systems
*
* guarded.By InternalClientMembership.class
*/
private static boolean isMonitoring = false;
/**
* This work used to be in a class initializer. Unfortunately, this allowed the class to escape
* before it was fully initialized, so now we just make sure this work is done before any public
* static method on it is invoked.
*/
private static synchronized void startMonitoring() {
if (isMonitoring) {
return;
}
synchronized (systems) {
// Initialize our own list of distributed systems via a connect listener
List existingSystems = InternalDistributedSystem
.addConnectListener(new InternalDistributedSystem.ConnectListener() {
public void onConnect(InternalDistributedSystem sys) {
addInternalDistributedSystem(sys);
}
});
isMonitoring = true;
// While still holding the lock on systems, add all currently known
// systems to our own list
for (Iterator iter = existingSystems.iterator(); iter.hasNext();) {
InternalDistributedSystem sys = (InternalDistributedSystem) iter.next();
try {
if (sys.isConnected()) {
addInternalDistributedSystem(sys);
}
} catch (DistributedSystemDisconnectedException e) {
// it doesn't care (bug 37379)
}
}
} // synchronized
}
private InternalClientMembership() {}
/**
* Registers a {@link ClientMembershipListener} for notification of connection changes for
* CacheServer and clients.
*
* @param listener a ClientMembershipListener to be registered
*/
public static void registerClientMembershipListener(ClientMembershipListener listener) {
startMonitoring();
synchronized (membershipLock) {
List oldListeners = clientMembershipListeners;
if (!oldListeners.contains(listener)) {
List newListeners =
new ArrayList(oldListeners);
newListeners.add(listener);
clientMembershipListeners = newListeners;
}
}
}
/**
* Removes registration of a previously registered {@link ClientMembershipListener}.
*
* @param listener a ClientMembershipListener to be unregistered
*/
public static void unregisterClientMembershipListener(ClientMembershipListener listener) {
startMonitoring();
synchronized (membershipLock) {
List oldListeners = clientMembershipListeners;
if (oldListeners.contains(listener)) {
List newListeners =
new ArrayList(oldListeners);
if (newListeners.remove(listener)) {
clientMembershipListeners = newListeners;
}
}
}
}
/**
* Returns an array of all the currently registered ClientMembershipListeners.
* Modifications to the returned array will not effect the registration of these listeners.
*
* @return the registered ClientMembershipListeners; an empty array if no listeners
*/
public static ClientMembershipListener[] getClientMembershipListeners() {
startMonitoring();
// Synchronization is not needed because we never modify this list
// in place.
List l = clientMembershipListeners; // volatile fetch
// convert to an array
ClientMembershipListener[] listeners =
(ClientMembershipListener[]) l.toArray(new ClientMembershipListener[l.size()]);
return listeners;
}
/**
* Removes registration of all currently registered ClientMembershipListeners. and
* ClientMembershipListeners.
*/
public static void unregisterAllListeners() {
startMonitoring();
synchronized (membershipLock) {
clientMembershipListeners = new ArrayList();
}
}
/**
* Returns a map of client memberIds to count of connections to that client. The map entry key is
* a String representation of the client memberId, and the map entry value is an Integer count of
* connections to that client. Since a single client can have multiple ConnectionProxy objects,
* this map will contain all the Connection objects across the ConnectionProxies
*
* @param onlyClientsNotifiedByThisServer true will return only those clients that are actively
* being updated by this server
* @return map of client memberIds to count of connections to that client
*
*
*/
public static Map getConnectedClients(boolean onlyClientsNotifiedByThisServer) {
ClientHealthMonitor chMon = ClientHealthMonitor.getInstance();
Set filterProxyIDs = null;
if (onlyClientsNotifiedByThisServer) {
// Note it is not necessary to synchronize on the list of Client servers here,
// since this is only a status (snapshot) of the system.
for (Iterator bsii = CacheFactory.getAnyInstance().getCacheServers().iterator(); bsii
.hasNext();) {
CacheServerImpl bsi = (CacheServerImpl) bsii.next();
AcceptorImpl ai = bsi.getAcceptor();
if (ai != null && ai.getCacheClientNotifier() != null) {
if (filterProxyIDs != null) {
// notifierClients is a copy set from CacheClientNotifier
filterProxyIDs.addAll(ai.getCacheClientNotifier().getActiveClients());
} else {
// notifierClients is a copy set from CacheClientNotifier
filterProxyIDs = ai.getCacheClientNotifier().getActiveClients();
}
}
}
}
Map map = chMon.getConnectedClients(filterProxyIDs);
/*
* if (onlyClientsNotifiedByThisServer) { Map notifyMap = new HashMap();
*
* for (Iterator iter = map.keySet().iterator(); iter.hasNext();) { String memberId = (String)
* iter.next(); if (notifierClients.contains(memberId)) { // found memberId that is notified by
* this server notifyMap.put(memberId, map.get(memberId)); } } map = notifyMap; }
*/
return map;
}
/**
* This method returns the CacheClientStatus for all the clients that are connected to this
* server. This method returns all clients irrespective of whether subscription is enabled or not.
*
* @return Map of ClientProxyMembershipID against CacheClientStatus objects.
*/
public static Map getStatusForAllClientsIgnoreSubscriptionStatus() {
Map result = new HashMap();
if (ClientHealthMonitor.getInstance() != null)
result = ClientHealthMonitor.getInstance().getStatusForAllClients();
return result;
}
/**
* Caller must synchronize on cache.allClientServersLock
*
* @return all the clients
*/
public static Map getConnectedClients() {
// Get all clients
Map allClients = new HashMap();
for (Iterator bsii = CacheFactory.getAnyInstance().getCacheServers().iterator(); bsii
.hasNext();) {
CacheServerImpl bsi = (CacheServerImpl) bsii.next();
AcceptorImpl ai = bsi.getAcceptor();
if (ai != null && ai.getCacheClientNotifier() != null) {
allClients.putAll(ai.getCacheClientNotifier().getAllClients());
}
}
// Fill in the missing info, if HealthMonitor started
if (ClientHealthMonitor.getInstance() != null)
ClientHealthMonitor.getInstance().fillInClientInfo(allClients);
return allClients;
}
public static Map getClientQueueSizes() {
Map clientQueueSizes = new HashMap();
GemFireCacheImpl c = (GemFireCacheImpl) CacheFactory.getAnyInstance();
if (c == null) // Add a NULL Check
return clientQueueSizes;
for (Iterator bsii = c.getCacheServers().iterator(); bsii.hasNext();) {
CacheServerImpl bsi = (CacheServerImpl) bsii.next();
AcceptorImpl ai = bsi.getAcceptor();
if (ai != null && ai.getCacheClientNotifier() != null) {
clientQueueSizes.putAll(ai.getCacheClientNotifier().getClientQueueSizes());
}
} // for
return clientQueueSizes;
}
/**
* Returns a map of servers to count of pools connected to that server. The map entry key is a
* String representation of the server,
*
* @return map of servers to count of pools using that server
*/
public static Map getConnectedServers() {
final Map map = new HashMap(); // KEY:server (String), VALUE:List of active endpoints
// returns an unmodifiable set
Map/* */ poolMap = PoolManager.getAll();
Iterator pools = poolMap.values().iterator();
while (pools.hasNext()) {
PoolImpl pi = (PoolImpl) pools.next();
Map/* */ eps = pi.getEndpointMap();
Iterator it = eps.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
ServerLocation loc = (ServerLocation) entry.getKey();
org.apache.geode.cache.client.internal.Endpoint ep =
(org.apache.geode.cache.client.internal.Endpoint) entry.getValue();
String server = loc.getHostName() + "[" + loc.getPort() + "]";
Integer count = (Integer) map.get(server);
if (count == null) {
map.put(server, Integer.valueOf(1));
} else {
map.put(server, Integer.valueOf(count.intValue() + 1));
}
}
}
return map;
}
public static Map getConnectedIncomingGateways() {
Map connectedIncomingGateways = null;
ClientHealthMonitor chMon = ClientHealthMonitor.getInstance();
if (chMon == null) {
connectedIncomingGateways = new HashMap();
} else {
connectedIncomingGateways = chMon.getConnectedIncomingGateways();
}
return connectedIncomingGateways;
}
/**
* Notifies registered listeners that a Client member has connected
*
* @param clientId the representing the client
*/
public static void notifyClientJoined(final DistributedMember clientId) {
notifyListeners(clientId, true, EventType.JOINED);
}
/**
* Notifies registered listeners that a Client member has left
*
* @param clientId the representing the client
*/
public static void notifyClientLeft(final DistributedMember clientId) {
notifyListeners(clientId, true, EventType.LEFT);
}
/**
* Notifies registered listeners that a Client member has crashed
*
* @param clientId the representing the client
*/
public static void notifyClientCrashed(final DistributedMember clientId) {
notifyListeners(clientId, true, EventType.CRASHED);
}
/**
* Notifies registered listeners that a Client member has connected
*
* @param location the address of the server
*/
public static void notifyServerJoined(final ServerLocation location) {
DistributedMember id = new InternalDistributedMember(location);
notifyListeners(id, false, EventType.JOINED);
}
/**
* Notifies registered listeners that a Client member has left
*
* @param location the address of the server
*/
public static void notifyServerLeft(final ServerLocation location) {
DistributedMember id = new InternalDistributedMember(location);
notifyListeners(id, false, EventType.LEFT);
}
/**
* Notifies registered listeners that a Client member has crashed
*
* @param location the address of the server
*/
public static void notifyServerCrashed(final ServerLocation location) {
DistributedMember id = new InternalDistributedMember(location);
notifyListeners(id, false, EventType.CRASHED);
}
/**
* Notifies registered listeners that a Client member has joined. The new member may be a client
* connecting to this process or a server that this process has just connected to.
*
* @param member the DistributedMember
* @param client true if the member is a client; false if server
* @param typeOfEvent joined/left/crashed
*/
private static void notifyListeners(final DistributedMember member, final boolean client,
final EventType typeOfEvent) {
startMonitoring();
ThreadPoolExecutor queuedExecutor = executor;
if (queuedExecutor == null) {
return;
}
final ClientMembershipEvent event = new InternalClientMembershipEvent(member, client);
if (forceSynchronous) {
doNotifyClientMembershipListener(member, client, event, typeOfEvent);
} else {
try {
queuedExecutor.execute(() -> {
doNotifyClientMembershipListener(member, client, event, typeOfEvent);
});
} catch (RejectedExecutionException e) {
// executor must have been shutdown
}
}
}
private static void doNotifyClientMembershipListener(DistributedMember member, boolean client,
ClientMembershipEvent clientMembershipEvent, EventType eventType) {
for (Iterator iter = clientMembershipListeners.iterator(); iter
.hasNext();) {
ClientMembershipListener listener = iter.next();
try {
if (eventType.equals(EventType.JOINED)) {
listener.memberJoined(clientMembershipEvent);
} else if (eventType.equals(EventType.LEFT)) {
listener.memberLeft(clientMembershipEvent);
} else {
listener.memberCrashed(clientMembershipEvent);
}
} catch (CancelException e) {
// this can be thrown by a server when the system is shutting
// down
return;
} catch (VirtualMachineError e) {
SystemFailure.initiateFailure(e);
throw e;
} catch (Throwable t) {
SystemFailure.checkFailure();
logger.warn(LocalizedMessage.create(LocalizedStrings.LocalRegion_UNEXPECTED_EXCEPTION), t);
}
}
}
// /**
// * Returns true if there are any registered
// * ClientMembershipListeners.
// */
// private static boolean hasClientMembershipListeners() {
// synchronized (membershipLock) {
// return !membershipListeners.isEmpty();
// }
// }
protected static void addInternalDistributedSystem(InternalDistributedSystem s) {
synchronized (systems) {
s.addDisconnectListener(new InternalDistributedSystem.DisconnectListener() {
@Override
public String toString() {
return "Disconnect listener for InternalClientMembership";
}
public void onDisconnect(InternalDistributedSystem ss) {
removeInternalDistributedSystem(ss);
}
});
systems.add(s);
// make sure executor is alive
ensureExecutorIsRunning(); // optimized to do nothing if already running
}
}
protected static void removeInternalDistributedSystem(InternalDistributedSystem sys) {
synchronized (systems) {
systems.remove(sys);
if (systems.isEmpty()) {
// clean up executor
/*
* Object[] queueElementsBefore = new Object[executorQueue.size()]; queueElementsBefore =
* executorQueue.toArray(queueElementsBefore);
* System.out.println("Before shut down, the executor's queue contains the following " +
* queueElementsBefore.length + " elements"); for (int i=0; i
* If false this means that a server has joined/left/crashed
*/
private final boolean client;
protected InternalClientMembershipEvent(DistributedMember member, boolean isClient) {
this.member = member;
this.client = isClient;
}
public DistributedMember getMember() {
return this.member;
}
public String getMemberId() {
return this.member == null ? "unknown" : this.member.getId();
}
public boolean isClient() {
return this.client;
}
@Override // GemStoneAddition
public String toString() {
final StringBuffer sb = new StringBuffer("[ClientMembershipEvent: ");
sb.append("member=").append(this.member);
sb.append(", isClient=").append(this.client);
sb.append("]");
return sb.toString();
}
}
/** If set to true for testing then notification will be synchronous */
private static boolean forceSynchronous = false;
/** Set to true if synchronous notification is needed for testing */
public static void setForceSynchronous(boolean value) {
forceSynchronous = value;
}
private static enum EventType {
JOINED, LEFT, CRASHED
}
}