WebSphere_UsrGrp_PubSub.ppt
Transcript of WebSphere_UsrGrp_PubSub.ppt
© 2005 IBM Corporation
SOA on your terms and our expertise
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Publish / Subscribe
Tim PickrellIT SpecialistBusiness Integration Architect, Lab Services
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Agenda
IBM’s Publish / Subscribe Product set
Publish / Subscribe Concepts and facilities
Ease of implementation
Why use Publish / Subscribe?
Experiences and some Gotchas
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Publish / Subscribe Product Set - History
MA0C Supportpac
MQSeries Integrator V2.0
– Topic Based Security and contect based filters
– RFH2 Header
MQSeries Integrator V2.0.x
– Telemetry and Mobile
WebSphere MQSeries Event Broker V2.1
– Real-time transport
WebSphere MQSeries Integration Message/Event Broker V5
– Multicast
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WebSphere Business Integration Brokers
WebSphere Publish / Subscribe
WebSphere Business Integrator Event Broker V6.0
WebSphere Business Integrator Message Broker V6.0
WebSphere Service Integration Bus
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Publish / Subscribe Concepts and Capabilities
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What is Publish / Subscribe?
Publisher 1
Train Schedules
Publisher 2
Flight Schedules
Subscriber 1
Train Schedules
Subscriber 2
Train and flight Schedules
Broker
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What is a Subscriber?
An application that is interested in receiving data of a certain type or category
– matches a specific category or “topic”
Need not know where the data comes from
Does not know how the data was delivered to the subscriber
Identifies the topic(s) on which it is interested in receiving associated data
Example
– Interested in price of IBM stock
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What is a Publisher?
Application that owns data to be made available to other applications (subscribers)
Does not know which or how many subscribers are interested in the data
Does not know how to deliver the data to the subscribers
Associates the data with a “topic”
Example: stock trading
– New stock price
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What is a topic?
A topic is an arbitrary string
Can be part of a hierarchy
– Levels delimited by /
Wildcards are allowed on subscriptions
– # matches any number of levels
– + matches a single level
– One # and any number of + permitted in a subscription
– Wildcards must be delimited by /
– # as topic matches everything
Support for multiple subscription points (streams) – MQ
– Similar to high level topic but on a separate tree
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What is a Topic - Example
MarketData
RealTime Delayed
EQ FI OP
SYMBOL
EQ FI OP
Special characters in topics…
Topic level separator
Single-level wildcard +
Multi-level wildcard #
e.g Subscription - MD/R/EQ/IBM
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Publish / Subscribe characteristics
Subscriber population changing rapidly
All users are interested in an identical message
Push applications
Minimize management overhead
– No central control or no control at all
Examples of good fit
– Streaming video
– Stock tickers
Multicast/Broadcast (if used) saves network bandwidth
– Good for one to many
– Logging more efficient
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Publish / Subscribe Application Styles
Events
– Every published message is significant
– Subscribers receive as available
State
– Information that is being updated/replaced
– Brokers retain latest publications
– Subscribers receive when updated and/or when desired
Conferencing
– Publisher also subscriber
– Option to suppress own publications
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Programming Interfaces
MQI
– Uses RFH2 headers for pub/sub information
JMS
– Durable versus non-durable
– API, not a protocol or implementation
XMS
AMI
– Recommend you don’t use this for new development
WebSphere Message Broker compute node
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MQI Publish / Subscribe Capabilities
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Publish / Subscribe using the MQ transport
BrokerPublisher Subscriber
Publish
Delete Publication
Response Response
Register Subscriber
DeRegister Subscriber
Request Update
Publish
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Simple Publish / Subscribe
Publisher
Subscriber
Subscriber Queue
Broker
Input Queue
Control Queue
1 - Publish
3 - Publish
4 - Publish
3 - DeRegSub
2 - Subscribe
5
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Retained publications
Publisher
Subscriber
Subscriber Queue
Broker
Input Queue
Control Queue
1 - Publish 3 - Publish
2 - Subscribe
4
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Publish on request
Publisher
Subscriber
Subscriber Queue
Broker
Input Queue
Control Queue
1 - Publish5 - Publish
2 - Subscribe
6
3 - Publish
4 – Request Update
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Subscriptions
A subscription consists of:
One or more topics – wildcards can be used
An optional subscription point or Stream
An optional filter on the message content
A subscriber queue, queue manager and Correlation-id
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The psc folder – registering a subscriber
<psc>
<Command>RegSub</Command>
<Topic>Sport/Soccer/Score</Topic>
<QMgrName>SPORT1</QMgrName
<QName>RESULTS</QName>
<PubOpt>CorrelAsId</PubOpt>
</psc>
The combination of queue manager name, queue name and correlation-Id is known as the subscriber-Id
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Mapping published messages to subscribers
MQMD RFH2 Data
<Topic/Sport/Soccer/Score</Topic>
Subscriber-Id SubscriptionsQMGR: SPORT1
Queue: RESULTS, CorrelAsId
Topic: Sport/Soccer/#
Topic: Sport/+/Score
QMGR: SPORT1
Queue:Events, CorrelAsId
Topic: Sport/Events/#
MQMD: correlid from subscriber
QMGR: SPORT1
Queue: RESULTS
Publication message
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Publishing using the MQ transport
Broker needs a Message Flow to tell it how to publish
Message flow names input queue for publish message source
Recommend failure and log queues
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Publication Node Properties
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Shared Subscription Queues
Shared subscription queues
– Correlid sent on subscribe request
– Published messages have same correlation id
– Requires use of correlasid option
Non-shared subscription queues
– Multiple subscriptions match same publication
– Only a single message is returned to subscriber
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Subscription DeRegistration
Subscriptions can be deregistered using the DeRegister subscription command message
A subscription may expire
A subscription can be removed by an administrator from the subscriptions view of the broker toolkit
The broker automatically deregisters subscriptions on closure of a temporary dynamic subscription queue
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WebSphere Transports
High Performance
Broker
WebSphere MQ Enterprise
WebSphere MQ Mobile
WebSphere MQ Telemetry
WebSphere MQ Real-time
WebSphere MQ Enterprise
WebSphere MQ Mobile
WebSphere MQ Telemetry
WebSphere MQ Real-time
WebSphere MQ Multicast
WebSphere MQ Web Services WebSphere MQ Web Services
Send and Receive using Any transport
Transports Optimised for your unique application needs
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JMS and XMS Publish / Subscribe Capabilities
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Sample JMS Code
// Obtain a TCF TopicConnectionFactory tcf = new MQTopicConnectionFactory();
// Obtain MQ-specific referenceMQTopicConnectionFactory mqtcf = (MQTopicConnectionFactory)tcf; // Create a topic connectionTopicConnection conn = tcf.createTopicConnection();
// start the connectionconn.start();
// Create a topic session from the connectionTopicSession topicsess = conn.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
// Create the TopicString topicstring = "TEST/TOPIC";Topic t = topicsess.createTopic(topicstring);
// Create the publisher pub = topicsess.createPublisher(t);
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Sample JMS Code continued
// Set up the publication messageTextMessage msg = null;msg = topicsess.createTextMessage();String msgdata = "Sample Publication message";msg.setText(msgdata);
// Publish !pub.publish(msg);
// tidy up by closing the publisher, session and connection objectspub.close();sess.close();conn.close();
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Sample JMS Code
package jms11;
import javax.naming.*; // The JNDI classes
import javax.jms.*; // The JMS 1.1 classes
public class JMS11UnifiedTransactionExample {
/**
* Transfer a message from a source destination
* to a target destination. The destinations may
* both be queues, both be topics, or may be from a
* queue to a topic, or from a topic to a queue.
*/
public void transferMessage(String connectionFactoryName, String sourceName, String targetName)
throws NamingException, JMSException {
// Get the specified connection factory and destinations
Context jndiContext = new InitialContext();
ConnectionFactory factory = (ConnectionFactory)
jndiContext.lookup(connectionFactoryName);
Destination source = (Destination) jndiContext.lookup(sourceName);
Destination target = (Destination) jndiContext.lookup(targetName);
// Create the connection and session
Connection connection = factory.createConnection();
Session session = connection.createSession(true,
Session.AUTO_ACKNOWLEDGE);
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Sample JMS Code - continued
// Use the session and destinations to
// create the consumer and producer
MessageConsumer consumer = session.createConsumer(source);
MessageProducer producer = session.createProducer(target);
// Transfer the next message on the source
// destination to the target destination
// in a single transaction
try {
producer.send(consumer.receive());
session.commit();
}
catch (JMSException ex) {
session.rollback();
}
// Release all resources
producer.close();
consumer.close();
session.close();
connection.close();
}
}
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XMS Client Overview A C++ implementation of the JMS Messaging API
Simple API to code, simplifies the programming and manages all connections
Common messaging API across IBM integration products– Current (WMQ) and future (WPM etc.)
High level Message classes (JMS 1.1)
Simplified Point-to-Point and Publish/Subscribe messaging– Send/Receive messages to/from queues or topics
Decoupled Administration – Admin tooling to define Connection Factories and Destinations– Directory can be LDAP, COS naming, or file system based JNDI– XMS and JMS can both use the same administered objects
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Sample Message Service Client for C/C++ code (IA94)using IBM.XMS;namespace IBM.XMS.LeggiXMS{ public class LeggiXMS {
/// <summary>/// The main entry point for the application./// </summary>[STAThread]static void Main(string[] args){ try { Hashtable hash = new Hashtable(); hash.Add(XMSC.IC_URL, "file://C:/JNDI-Directory/.bindings"); IContext ctx = new InitialContext(hash); IConnectionFactory connectionFactory = (IConnectionFactory)ctx.Lookup("CF_XMS"); IConnection connection = connectionFactory.CreateConnection(); ISession session = connection.CreateSession(false, AcknowledgeMode.AutoAcknowledge); IDestination topic = (IDestination)ctx.Lookup(“TOPIC_XMS"); IMessageConsumer consumer = session.CreateConsumer(topic); IMessage msg = consumer.Receive(0); ITextMessage msgTxt = msg as ITextMessage; if (msgTxt != null) { System.Console.WriteLine( msgTxt.Text ); } else { System.Console.WriteLine( "Empty message" ); } consumer.Close(); queue.Dispose(); session.Close(); connection.Close();
} catch (XMSException e) { System.Console.WriteLine(e.Message); System.Console.WriteLine(e.LinkedException.Message); }}
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WebSphere Real-time transport
High-performance protocol designed for publish/subscribe– Developed at IBM Research (Hawthorne)
Non-persistent (non-durable) messages only
Uses direct TCP/IP connection– Does not use WebSphere MQ
Supports JMS and XMS clients
Integrated in Message Broker V6.0 and Event Broker V6.0– First released in WMQ Event Broker V2.1
Number of connections may be limited by operating system– Requires multiple brokers in collective for more connections
Unicast and Multicast
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Unicast vs Multicast
Multiple transmissions to send the same message.
Single transmission to send same message to all clients.
All clients must be on the same LAN segment.
Unicast
Multicast
4 Transmissions
1 Transmission
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Multicast Advantages
Scaleable
– Conserves network bandwidth
– Minimises broker resource utilisation
– Particularly effective with high numbers of subscribers
Fairness (simultaneous reception)
– Only within the same LAN segment
Minimises latency
Neat Mapping with publish / subscribe
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Publish / Subscribe nodes
Receives Subscription and Publication Requests
Receives Subscription and Publication requests. Publishes
directly.
Receives Publication requests that include an RFH header
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Real-timeOptimizedFlow node
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Real-Time Input node
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Real-timeInput Node properties
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Broker Networks
Broker Broker
BrokerBroker
Broker Broker
Broker Broker
Broker
London New York
Tokyo
Multiple brokers can be interconnected
Performance & scalability
Availability
Geographical distributionConfigMgr – not shown
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Broker Network configuration
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Broker Properties
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Broker – Multicast properties
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Broker Toolkit - Subscription view
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Cloned Subscriptions – High Availability
QM
QMSUBQ
BrokerPUBQ
CTRLQ
P
S
QM
BrokerPUBQ
CTRLQ
QMSUBQ
S
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Message Broker – Topic Based Security
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Best Practices
Deciding on a transport
Queuing vs messaging
Is the application really a pub/sub application?
Logging of published messages
High fan-out vs high fan-in
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Why use Publish / Subscribe?
All applications are interested in an identical message
Subscriber population is dynamic and changes rapidly
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Market Data Solution Configuration
Broker 1 Broker 2
RMMToEB RMMToEBWAS
Fat Pipe
Tick Receiver
WAS
Real Time Loader
MQ
Trade
PipePosition Server
Trade Feed
External
Trades
JMSJMS
RMM
RMM
RMM
TAM ITM
DJ30,DJ30 Delay,Options, Position blotter, History request,
etc
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Design of the Topic Hierarchy
Design of the topic hierarchy requires careful consideration !
Must be flexible enough to satisfy business requirements when matching publications to subscribers
Must provide sufficient granularity for topic based security
Has a potential impact on performance – including assignment of multicast groups
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Design of the Topic Hierarchy Continued
/[R|D]/[E|O|F]/B[1..100]/Symbol/Exchange
Real-time or Delay Service
Equities, Fixed-Income or Options
Multicast Bucket
Symbol e.g. IBM
Exchange e.e Nasdaq
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Real Time Messaging – Example architecture
FBSI
MAUI
SDIST
Application Server
Web Server
FENS
EDB
Exc
hang
es
XML
URL Get RequestXML Document Reply
HTTP
TIBCo RVUnsecure UDP
XpressoXML
TIBCoRemote RVRD
Alert data &Notification Info
Alerts or Tickle messages that user info is available
Inbound: · Trades & · Data RequestsOutbound: · Replies
Alerts or Tickle messages that user info is available
as well asReal time market data
RMDS
TIBCoRV
Real time market data
Trade status &Notificaiton info
Outbound: · TradesInbound: · Execution status
ATPClient
Inbound: Requests for alert data & notification infoOutbound: Replies
Proxy Server
URL Get RequestXML Document Reply
HTTPS
HTTPS
Fire
wal
l
Fire
wal
l
DMZ
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Solution Components
IBM Out of the Box Components
– WMQ
– Message Broker
– Replay Server
– WebSphere Application Server
– DB2
– XMS Client API
Custom Applications
– WebSphere Application Server App
– Heartbeat Monitor App
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S S
XMS
UDB
Broker Replay
Server
CommandHandler
Solution Server
Replay Proxy
Monitor App
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WAS Core Components
S
WebSphere Application Server
Application Server Cluster
ATP Client
Clustered Messaging Endpoint
Messaging Endpoint
Resource Status Table
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Register Client Subscription
S
Replay Proxy: Simple class that subscribes to replay server and publishes to client topics. Serves multiple clients.
MDB: Client
Command Handler
Lookup Table
•---------
•---------
Client Command Handler: Implemented as a Message Driven Bean, handles subscription and description requests from the client.
Message Broker
Replay Server
1
2
3
1. Register subscription request
2. Add reference to lookup table
3. Register client with replay proxy
Replay Proxy
Sub ID/WS 00:34:45
Verb Topic Timestamp
Lookup Table: Client to Replay server topic mapping
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Related material
Redbook - MQSeries Publish/Subscribe Applications
– http://publib-b.boulder.ibm.com/abstracts/sg246282.html
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WebSphere Event Broker
Subset of Message Broker V6
– Transformation capability removed
• Message repository• Most processing nodes (e.g. compute, filter)
– Includes Generic XML parser only
• Content based limited to XML messages
Both Message Broker and Event Broker include
– Gryphon technology from IBM Research for real-time support
– Multicast support developed by IBM Haifa
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SOA Reference Architecture
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