By using Work Managers the IFS Connect framework can achieve thread isolation when executing native code within Connector Senders and Readers. Furthermore Work Managers can be used for better control of Message Driven Beans (MDBs) behavior used by the IFS Connect framework.
IFS Connect framework is using Work Manager API, from the
commonj.work Java package, to run native code in Connector Senders and Readers, in a separate thread. Work Managers and the associated threads are controlled by the application Server. With this concept it is possible to run a particular piece of code in another thread while the caller is waiting for the thread execution to be finished. It is also possible to define a maximum amount of time (work timeout) the caller is supposed to wait for the thread to finish. If the code executed in another thread takes too long time, for example because of it is hanging on external resource, the caller can abandon the called code in the other thread and continue with the flow. The other thread may finish its execution later on or may be hanging, but the result will not be delivered to the caller in such situation and the actual Application or Reader Message will be marked as failed.
Work timeouts can be specified in Setup IFS Connect window located in Solution Manager / Integration / IFS Connect
Work timeout for Connector Senders and Readers¶
You can specify the work timeout for each instance of Connector Sender or Reader in Setup IFS Connect window. On each sender or reader instance you'll find a parameter with name WORK_TIMEOUT that is accepting an integer value representing work timeout in seconds. If not specified the default value is taken.
Default Work timeout¶
If work timeout for a particular instance is not specified the default value will be taken. The default work timeout can also be defined in the Setup IFS Connect window, Servers, configuration of J2EE_SERVER instance. Here you will find an integer parameter with name DEFAULT_WORK_TIMEOUT that will allow you to specify the default timeout in seconds:
Message Driven Beans¶
All Message Driven Beans used by the IFS Connect framework (see also Batch Processor) have corresponding Work Managers defined in the Middleware Server. By default only some of them have additional constraints defined, but it is possible to add/modify constraints to all Work Manages, if necessary.
Synchronous invocation from PLSQL Acces Provider¶
For best performance, low latency and good throughput, all Message Driven Beans and Connect Senders involved in processing of outbound synchronous message have their Work Managers defined with additional constraints (Forwarder MDB, Invoke MDB, Connect Sender Invoke; both Main and Integration cluster).
The defined constraints are:
Fair Share Request Classwith value of 100 will guarantee the high priority of the invoke request.
Minimum Thread Constraint(Forwarder 3, others 16) allocates a pre-defined number of threads exclusively for the actual Work Manager for the lowest possible latency. Normally the value for Invoke MDB and Connect Sender should be the same and correspond to the number of concurrent requests.
Maximum Thread Constraint(Forwarder 16, others 64) limits the maximum number of threads that the actual Work Manager may request. Default is 16 if the constraint is not set.
The default values should be sufficient in the most of cases, but if necessary can be changed to values more suitable for the actual installation. It is possible to enable statistics and with help from R&D organization find out the proper values of the constraints.