Understanding the Enterprise Scheduler Service in ICS by Sherwood Zern

 

Introductionimage

In many enterprise integration scenarios there is a requirement to initiate tasks at scheduled times or at user defined intervals. The Oracle Integration Cloud Service (ICS) provides scheduling functionality via the Oracle Enterprise Scheduler to satisfy these types of requirements.  The Oracle Enterprise Scheduler Service (ESS) is primarily a Java EE application that provides time-based and schedule-based callbacks to other applications to run their jobs. Oracle ESS applications define jobs and specify when those jobs need to be executed and then gives these applications a callback at the scheduled time or when a particular event arrives. Oracle ESS does not execute the jobs itself, it generates a callback to the application and the application actually executes the job request. This implies that Oracle Enterprise Scheduler Service is not aware of the details of the job request; all the job request details are owned and managed by the application.

What follows will be a discussion as to how ICS utilizes the ESS feature.  The document will cover how the ESS threads are allocated and the internal preparation completed for file processing.

Quick ICS Overview

The Integration Cloud Service deployment topology consists of one cluster.  The cluster has two managed servers along with one administration server.  This bit of information is relevant to the discussion of how the Enterprise Scheduler Service works and how it is used by applications like an ICS flow that runs in a clustered HA environment.

A common use case for leveraging ESS is to setup a schedule to poll for files on an FTP server at regular intervals.  At the time files are found and then selected for processing, the ESS does some internal scheduling of these files to ensure the managed servers are not overloaded.  Understanding how this file processing works and how throttling might be applied automatically is valuable information as you take advantage of this ICS feature.

An integration can be scheduled using the ICS scheduling user interface (UI). The UI provides a basic and an advanced option.  The basic option provides UI controls to schedule when to execute the integration. Read the complete article here

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Technorati Tags: SOA Community,Oracle SOA,Oracle BPM,OPN,Jürgen Kress

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About Jürgen Kress
As a middleware expert Jürgen works at Oracle EMEA Alliances and Channels, responsible for Oracle’s EMEA Fusion Middleware partner business. He is the founder of the Oracle SOA & BPM and the WebLogic Partner Communities and the global Oracle Partner Advisory Councils. With more than 5000 members from all over the world the Middleware Partner Community is the most successful and active community at Oracle. Jürgen manages the community with monthly newsletters, webcasts and conferences. He hosts his annual Fusion Middleware Partner Community Forums and the Fusion Middleware Summer Camps, where more than 200 partners get product updates, roadmap insights and hands-on trainings. Supplemented by many web 2.0 tools like twitter, discussion forums, online communities, blogs and wikis. For the SOA & Cloud Symposium by Thomas Erl, Jürgen is a member of the steering board. He is also a frequent speaker at conferences like the SOA & BPM Integration Days, JAX, UKOUG, OUGN, or OOP.

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