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Qpid JCA Resource Adapter Installation/Configuration Instructions
Overview
========
The Qpid Resource Adapter is a JCA 1.5 compliant resource adapter that allows
for JEE integration between EE applications and AMQP 0.10 message brokers.
The Qpid JCA adapter provides both outbound and inbound connectivity and
exposes a variety of options to fine tune your messaging applications. Currently
the adapter only supports C++ based brokers and has only been tested with Apache
Qpid C++ broker.
The following document explains general configuration information for the Qpid JCA RA. Details for
specific application server platforms are provided in separate README files typically designated as
README-<server-platform>.txt.
Configuration
=============
As per the JCA specification, there are four main components of a JCA resource adapter:
The ResourceAdapter JavaBean
The ManagedConnectionFactory JavaBean
The ActivationSpec JavaBean
Administered Objects
Each of these components provide configuration options in the form of properties. The Resource Adapter
JavaBean provides a set of global configuration options while the ManagedConnectionFactory JavaBean allows
for the configuration of outbound connectivity options. The ActivationSpec JavaBean provides configuration
options for inbound connectivity.
When a ManagedConnectionFactory JavaBean or ActivationSpec JavaBean are deployed they can choose to inherit
the configuration properties from the ResourceAdapter or provide specific properties which in turn will override
the defaults.
While some of the properties from the three components are specific to the JCA adapter, a majority of the
properties directly correspond the the Qpid JMS client. As such, familiarity with the Qpid JMS Client is strongly
encouraged. Similarly, familiarity with the JCA 1.5 specification is encouraged though not strictly required.
The ResourceAdapter JavaBean
============================
The ResourceAdapter JavaBean provides global configuration options for both inbound and outbound
connectivity. The set of ResourceAdapter properties are described below. The ResourceAdapter properties
can be found in the META-INF/ra.xml deployment descriptor which is provided with the adapter. Note,
deploying a ResourceAdapter, ManagedConnectionFactory or ActivationSpec is application server specific.
As such, this document provides an explanation of these properties but not how they are configured.
ResourceAdapter JavaBean Properties
===================================
ClientId
The unique client identifier. From the JMS API this is used only in the context of durable subscriptions.
Default: client_id
SetupAttempts
The number of attempts the ResourceAdapter will make to successfully setup an inbound activation on deployment,
or when an exception occurs at runtime.
Default: 5
SetupInterval
The interval in milliseconds the adapter will wait between setup attempts.
Default: 5000
UseLocalTx
Whether or not to use local transactions instead of XA.
Default: false
Host
The hostname/ip address of the broker.
Default: localhost
Port
The port of the broker.
Default: 5672
Path
The virtual path for the connection factory.
Default: test
ConnectionURL
The full connection URL to the broker.
Default: amqp://anonymous:passwd@client/test?brokerlist='tcp://localhost?sasl_mechs='PLAIN''
TransactionManagerLocatorClass
The class responsible for locating the transaction manager within a specific application server.
This is a ResourceAdapter Java Bean specific property and is application server specific, as such,
no default is provided.
Default: none
TransactionManagerLocatorMethod
The specific method on the TransactionManagerLocatorClass used to acquire a reference to the platform
specific transaction manager. This is a ResourceAdapter Java Bean specific property and is application
server specific as such, no default is provided.
Default:none
UseConnectionPerHandler
The Apache C++ Broker multiplexes on the physical connection rather than the session. As a result, performance
improvements can be gained by allocating and assigning a connection per inbound listener. The alternative is
to share a connection across each handler for a given endpoint (MDB).
Default:true
The ManagedConnectionFactory JavaBean
=====================================
The ManagedConnectionFactory JavaBean provides outbound connectivity for the Qpid JCA adapter. In addition to most of the properties
inherited from the ResourceAdapter JavaBean, the ManagedConnectionFactory JavaBean provides specific properties only applicable
to outbound connectivity.
SessionDefaulType
The default type of Session. Currently unused.
Default: java.jms.Queue
UseTryLock
Multi-purpose property used to specify both that a lock on the underlying managed connection should be used, as well as the
wait duration to aquire the lock. Primarily used for transaction management. A null or zero value will atttempt to acquire
the lock without a duration. Anything greater than zero will wait n number of seconds before failing to acquire the lock.
Default:0
The ActivationSpec JavaBean
===========================
The ActivationSpec JavaBean provides inbound connectivity for the Qpid JCA adapter. In addition to most of the properties
inherited from the ResourceAdapter JavaBean, the ActivationSpec JavaBean provides specific properties only applicable
to inbound connectivity. As opposed to the ResourceAdapter and ManagedConnectionFactory JavaBean a majority of the
ActivationSpec JavaBean properties have no default value. It is expected that these will be provided via Java annotations
or deployment descriptor configuration properties. The Qpid JCA adapter provides inbound connectivity in conjunction
with the Message Driven Bean architecture from the EJB 3.x specification.
UseJNDI
Whether or not to attempt looking up an inbound destination from JNDI. If false, an attempt will be made to construct
the destination from the other ActivationSpec properties.
Default: true
Destination
The JNDI name of the destination on which to listen for messages.
Default:none
DestinationType
The type of destination on which to listen. Valid values are javax.jms.Queue or java.jms.Topic.
Default:none
MessageSelector
The JMS properties that will be used in selecting specific message. Please see the JMS specification for further details.
Default:none
AcknowlegeMode
Whether or not the client or consumer will acknowledge any messages it receives. Ignored in a transacted scenario.
Please see the JMS specification for more details.
Default:AUTO_ACKNOWLEDGE
SubscriptionDurablity
Whether or not the subscription is durable.
Default:none
SubscriptionName
The name of the subscription.
Default:none
MaxSession
The maximum number of sessions that this activation supports.
Default:15
TransactionTimeout
The timeout for the XA transaction for inbound messages.
Default:0
PrefetchLow
Qpid specific -- TODO more explanation
PrefetchHigh
Qpid specific -- TODO more explanation
Setup
Administered Objects
======================
The JCA specification provides for administered objects. Ass per the specification, administered objects are
JavaBeans that specific to the messaging provider. The Qpid JCA Resource Adapter provides three administered
objects that can be used to configure JMS destinations and a specialized JMS Connection Factory respectively.
Both these administered objects have properities to support configuration and deployment.
QpidQueue/QpidTopic
====================
The QpidQueue and QpidTopic AdminObjects allow binding JMS destintations into the JEE JNDI namespace. Both
objects support one property:
DestinationAddress
The address string of the destination. Please see the Qpid JMS client documentation for valid values.
Example:
DestinationAddress=hello.Queue;{create:always, node:{type:queue, x-declare:{auto-delete:true}}}
DestinationAddress=amq.topic/hello.Topic
The QpidQueue/QpidTopic AdminObjects allow a developer, deployer or adminstrator to create destinations
(queues or topic) and bind these destinations into JNDI. Only one property is required:
QpidConnectionFactoryProxy
==========================
The QpidConnectionFactoryProxy allows for a non-JCA ConnectionFactory to be bound into the JNDI tree. This
ConnectionFactory can in turn be used outside of the application server. Typically a ConnectionFactory of
this sort is used by Swing or other non-managed clients not requiring JCA. The QpidConnectionFactoryProxy
provides one property
ConnectionURL
This is the url used to configure the connection factory. Please see the Qpid JMS client documentation for
The QpidConnectionFactoryProxy allows for a non-JCA ConnectionFactory to be bound into the JNDI tree. This
ConnectionFactory can in turn be used outside of the application server. Typically a ConnectionFactory of
this sort is used by Java Swing or other non-managed clients not requiring JCA. One one property is
required:
Example:
amqp://anonymous:passwd@client/test?brokerlist='tcp://localhost:5672?sasl_mechs='PLAIN''
Transaction Support
===================
The Qpid JCA Resource Adapter provides three levels of transaction support: XA, LocalTransactions and NoTransaction.
Typical usage of the Qpid JCA Resource adapter implies the use of XA transactions, though there are certain scenarios
where this is not preferred. Transaction support configuration is application server specific and as such, is explained
in the corresponding documentation for each supported application server.
XA recovery, that is being able to recover 'in-doubt' transactions for a given resource manager is non-standardized,
and as such is application server specific. Currently, the Qpid JCA adapter only supports recovery for JBoss EAP 5.x
as a separate module.
Conclusion
==========
The above documentation provides a general description of the capabilities and configuration properites of the
Qpid JCA Resource Adapter. As previously mentioned, deploying an adapter in an application server requires
specific descriptors and configuration mechanisms. Please see the accompanying doc for your application server
for further details.
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