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The ActiveMQ Message Broker implementation
/**
* 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.activemq.broker;
import java.net.URI;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.activemq.Service;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Region;
import org.apache.activemq.broker.region.Subscription;
import org.apache.activemq.broker.region.virtual.VirtualDestination;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.BrokerId;
import org.apache.activemq.command.BrokerInfo;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.command.DestinationInfo;
import org.apache.activemq.command.MessageDispatch;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.command.SessionInfo;
import org.apache.activemq.command.TransactionId;
import org.apache.activemq.store.PListStore;
import org.apache.activemq.thread.Scheduler;
import org.apache.activemq.usage.Usage;
/**
* The Message Broker which routes messages, maintains subscriptions and
* connections, acknowledges messages and handles transactions.
*/
public interface Broker extends Region, Service {
/**
* Get a Broker from the Broker Stack that is a particular class
*
* @param type
* @return a Broker instance.
*/
Broker getAdaptor(Class type);
/**
* Get the id of the broker
*/
BrokerId getBrokerId();
/**
* Get the name of the broker
*/
String getBrokerName();
/**
* A remote Broker connects
*/
void addBroker(Connection connection, BrokerInfo info);
/**
* Remove a BrokerInfo
*
* @param connection
* @param info
*/
void removeBroker(Connection connection, BrokerInfo info);
/**
* A client is establishing a connection with the broker.
*
* @throws Exception TODO
*/
void addConnection(ConnectionContext context, ConnectionInfo info) throws Exception;
/**
* A client is disconnecting from the broker.
*
* @param context the environment the operation is being executed under.
* @param info
* @param error null if the client requested the disconnect or the error
* that caused the client to disconnect.
* @throws Exception TODO
*/
void removeConnection(ConnectionContext context, ConnectionInfo info, Throwable error) throws Exception;
/**
* Adds a session.
*
* @param context
* @param info
* @throws Exception TODO
*/
void addSession(ConnectionContext context, SessionInfo info) throws Exception;
/**
* Removes a session.
*
* @param context
* @param info
* @throws Exception TODO
*/
void removeSession(ConnectionContext context, SessionInfo info) throws Exception;
/**
* Adds a producer.
*
* @param context the environment the operation is being executed under.
* @throws Exception TODO
*/
@Override
void addProducer(ConnectionContext context, ProducerInfo info) throws Exception;
/**
* Removes a producer.
*
* @param context the environment the operation is being executed under.
* @throws Exception TODO
*/
@Override
void removeProducer(ConnectionContext context, ProducerInfo info) throws Exception;
/**
* @return all clients added to the Broker.
* @throws Exception TODO
*/
Connection[] getClients() throws Exception;
/**
* @return all destinations added to the Broker.
* @throws Exception TODO
*/
ActiveMQDestination[] getDestinations() throws Exception;
/**
* return a reference destination map of a region based on the destination type
*
* @param destination
*
* @return destination Map
*/
public Map getDestinationMap(ActiveMQDestination destination);
/**
* Gets a list of all the prepared xa transactions.
*
* @param context transaction ids
* @return array of TransactionId values
* @throws Exception TODO
*/
TransactionId[] getPreparedTransactions(ConnectionContext context) throws Exception;
/**
* Starts a transaction.
*
* @param context
* @param xid
* @throws Exception TODO
*/
void beginTransaction(ConnectionContext context, TransactionId xid) throws Exception;
/**
* Prepares a transaction. Only valid for xa transactions.
*
* @param context
* @param xid
* @return id
* @throws Exception TODO
*/
int prepareTransaction(ConnectionContext context, TransactionId xid) throws Exception;
/**
* Rollsback a transaction.
*
* @param context
* @param xid
* @throws Exception TODO
*/
void rollbackTransaction(ConnectionContext context, TransactionId xid) throws Exception;
/**
* Commits a transaction.
*
* @param context
* @param xid
* @param onePhase
* @throws Exception TODO
*/
void commitTransaction(ConnectionContext context, TransactionId xid, boolean onePhase) throws Exception;
/**
* Forgets a transaction.
*
* @param context
* @param transactionId
* @throws Exception
*/
void forgetTransaction(ConnectionContext context, TransactionId transactionId) throws Exception;
/**
* Get the BrokerInfo's of any connected Brokers
*
* @return array of peer BrokerInfos
*/
BrokerInfo[] getPeerBrokerInfos();
/**
* Notify the Broker that a dispatch is going to happen
*
* @param messageDispatch
*/
void preProcessDispatch(MessageDispatch messageDispatch);
/**
* Notify the Broker that a dispatch has happened
*
* @param messageDispatch
*/
void postProcessDispatch(MessageDispatch messageDispatch);
/**
* @return true if the broker has stopped
*/
boolean isStopped();
/**
* @return a Set of all durable destinations
*/
Set getDurableDestinations();
/**
* Add and process a DestinationInfo object
*
* @param context
* @param info
* @throws Exception
*/
void addDestinationInfo(ConnectionContext context, DestinationInfo info) throws Exception;
/**
* Remove and process a DestinationInfo object
*
* @param context
* @param info
*
* @throws Exception
*/
void removeDestinationInfo(ConnectionContext context, DestinationInfo info) throws Exception;
/**
* @return true if fault tolerant
*/
boolean isFaultTolerantConfiguration();
/**
* @return the connection context used to make administration operations on
* startup or via JMX MBeans
*/
ConnectionContext getAdminConnectionContext();
/**
* Sets the default administration connection context used when configuring
* the broker on startup or via JMX
*
* @param adminConnectionContext
*/
void setAdminConnectionContext(ConnectionContext adminConnectionContext);
/**
* @return the temp data store
*/
PListStore getTempDataStore();
/**
* @return the URI that can be used to connect to the local Broker
*/
URI getVmConnectorURI();
/**
* called when the brokerService starts
*/
void brokerServiceStarted();
/**
* @return the BrokerService
*/
BrokerService getBrokerService();
/**
* Ensure we get the Broker at the top of the Stack
*
* @return the broker at the top of the Stack
*/
Broker getRoot();
/**
* Determine if a message has expired -allows default behaviour to be
* overriden - as the timestamp set by the producer can be out of sync with
* the broker
*
* @param messageReference
* @return true if the message is expired
*/
boolean isExpired(MessageReference messageReference);
/**
* A Message has Expired
*
* @param context
* @param messageReference
* @param subscription (may be null)
*/
void messageExpired(ConnectionContext context, MessageReference messageReference, Subscription subscription);
/**
* A message needs to go the a DLQ
*
*
* @param context
* @param messageReference
* @param poisonCause reason for dlq submission, may be null
* @return true if Message was placed in a DLQ false if discarded.
*/
boolean sendToDeadLetterQueue(ConnectionContext context, MessageReference messageReference, Subscription subscription, Throwable poisonCause);
/**
* @return the broker sequence id
*/
long getBrokerSequenceId();
/**
* called when message is consumed
* @param context
* @param messageReference
*/
void messageConsumed(ConnectionContext context, MessageReference messageReference);
/**
* Called when message is delivered to the broker
* @param context
* @param messageReference
*/
void messageDelivered(ConnectionContext context, MessageReference messageReference);
/**
* Called when a message is discarded - e.g. running low on memory
* This will happen only if the policy is enabled - e.g. non durable topics
* @param context
* @param sub
* @param messageReference
*/
void messageDiscarded(ConnectionContext context, Subscription sub, MessageReference messageReference);
/**
* Called when there is a slow consumer
* @param context
* @param destination
* @param subs
*/
void slowConsumer(ConnectionContext context,Destination destination, Subscription subs);
/**
* Called to notify a producer is too fast
* @param context
* @param producerInfo
* @param destination
*/
void fastProducer(ConnectionContext context,ProducerInfo producerInfo,ActiveMQDestination destination);
/**
* Called when a Usage reaches a limit
* @param context
* @param destination
* @param usage
*/
void isFull(ConnectionContext context,Destination destination,Usage usage);
void virtualDestinationAdded(ConnectionContext context, VirtualDestination virtualDestination);
void virtualDestinationRemoved(ConnectionContext context, VirtualDestination virtualDestination);
/**
* called when the broker becomes the master in a master/slave
* configuration
*/
void nowMasterBroker();
Scheduler getScheduler();
ThreadPoolExecutor getExecutor();
void networkBridgeStarted(BrokerInfo brokerInfo, boolean createdByDuplex, String remoteIp);
void networkBridgeStopped(BrokerInfo brokerInfo);
}