We use singleton property in composite.xml file.
We can perform following operations with JMS adapter.
No, we can’t set polling frequencies for AQ and MQ adapters as both the adapters are event driven.
JMS is Java Message Queue which is open source, AQ is advanced queue which is Oracle standard and MQ is message queue which is IBM standard.
Yes, we can do that.
No, you need to create only when you need to specify custom properties otherwise you can use default connection factories.
These adapters come under tractional adapters category as these supports tractions.
The persistent store provides a built-in, high-performance storage solution for WebLogic Server subsystems and services that require persistence. For example, it can store persistent JMS messages or temporarily store messages sent using the Store-and-Forward feature. The persistent store supports persistence to a file-based store or to a JDBC-enabled database.
Yes, we can read custom header properties from JMS queue/topic by specifying the property name that we want to read.
JMS queue is used when we have one to one interaction, consumer put the message to JMS queue but only listener can pick the data from that queue as once that listener pick the data, data get deleted from the queue.
JMS topic is based on publish subscribe model, here multiple listeners/consumer can consume the same message. JMS topic is used when we need to trfer same data to multiple places.
When we read the data from JMS queue/topic based upon some condition then this property is used. E.g. we use same queue to store different types of message so in one flow we need to pick only Sales Order information so in sales order composite we use message selector property to pick only that record.
We have “Deliver Failure” tab in JMS queue where we can set properties to do retry after certain intervals.
JMS adapter is used to read/write data from/to JMS queue/topic. AQ adapter is used to deal with AQ and same way MQ adapter is used to interact with MQ.
We need to set activtionInstances=1 along with singleton property for AQ adapter in cluster environment to process message in sequential order.
We need to set following parameters.
Redelivery Delay Override: Time interval between retries. It is in milliseconds.
Redelivery Limit: number of retries
Redirect: redirect message to different queue.
Log: log the message.
Discard: discard message and it will be lost.
Error Destination: If you choose “Redirect” then chooses the queue to which you want to redirect message.
A connection factory is an object that a JMS client uses to create a connection with a JMS provider. We use connection factory in SOA suite tool to connect to server where JMS queue/topic created.
We need to use Inbound Thread Count property to control number of messages which MQ adapter pick from MQ.