PaaS Community Blog

5.000.000 Messages per Day Handled by Oracle Service Bus 11g by Pavel Samolysov

Hello everyone! Let me share a story about how to build an enterprise service bus (ESB), which connects together a number of legacy application and a new-born centralized information system, and how Oracle Service Bus (OSB) can help handle up to 5.000.000 messages in a day ensuring guaranteed delivery.

Challenge

Every data change from a one application (a source) must be synchronized with another application (a destination) in the near real-time mode, batch processing is not a solution. So, the changes need to be captured and free to publish on a service bus. The following pattern works fine: when a user changes data in the source application, a trigger in an application database creates a record in an event table. Let’s name a record in the event table as a "event". A event is specified by an id; a changed entity type; an operation, such as to create, update or delete; a state, such as new, in process, successful processed, unsuccessful processed. Actual data can be retrieved from the database using an id and a changed entity type because there is a database view for each type of entities, the bus has a concern in. The OSB instance polls the events using the database adapter and selects a corresponding record from a database view. The content of the retrieved record is transformed to the canonical data model of the service bus, from zero till five messages are generated for one database record. The messages are put in a JMS-queue, and the corresponding records in the database marked with the "in process" flag.
In order to send messages into a destination application, there is the OSB proxy-service gets messages from the JMS-queue, transforms it from the canonical model to a destination format, and calls a web-service provided by the destination application. The proxy-service waits for a service response, retrieves a status of handling from this one and put the status into a statuses queue. The bus gets the status from the queue and updates a corresponding record in the event table of the source application database.
Read the complete article here.

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Restoring OSB 12.2.1 Maven Functionality by Robert Patrick

It seems that testing of the Oracle Service Bus (OSB) Maven functionality in the new 12.2.1 release failed to catch a few issues that make the OSB Maven plugin unusable out of the box.  Oracle is aware of the issue and working to create a patch for this.  In the meantime, users can work around the problem with a few simple changes.  This blog documents those changes.

Fixing the com.oracle.servicebus:client POM

The first change we need to make is to edit the com.oracle.servicebus:client POM.  This POM can be found at ${ORACLE_HOME}/osb/plugins/maven/com/oracle/servicebus/client/12.2.1/client-12.2.1.pom.  Open this file in a text editor and make the following changes.

1. Delete the <dependency> stanza for the com.oracle.weblogic:wlthint3client.  This artifact does not exist.  Fortunately, it is is not needed since the weblogic-server-pom dependency provides all of the connectivity to WebLogic Server that is required.
2. In the weblogic-server-pom dependency, change the <version> element’s value from “LATEST” to “[12.2.1,12.2.2)” (without the double quotes).
3. In the com-bea-core-xml-xmlbeans dependency, change the <artifactId> element’s value from “com-bea-core-xml-xmlbeans” to “com.bea.core.xml.xmlbeans” (without the double quotes).
4. In the com-bea-core-xml-xmlbeans dependency, change the <version> element’s value from “LATEST” to “[12.2.1,12.2.2)” (without the double quotes).

After making these changes, the relevant section of the file should look like the one shown here. Read the complete article here.

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Servicebus 12c: Using configuration files for customizing service deployments by Sven Bernhardt

Introduction

In my last projects I faced different challenges in the area of how to manage environment-specific artefact configurations that need to be adjusted during rollout of a particular service component. As a result from that, I decided to write down my experiences and solution approaches regarding the corresponding topics. This article is the starting point for a short blog series dealing with different challenges in this area, where the following topics will be covered:

• General: Using configuration files for customizing service deployments
• Adjust environment-specific configurations at deployment time
• Evaluating environment-specific configurations at runtime
• Security: Approaches for credentials management

Configuration files in Servicebus

During its lifecycle a specific service component needs to pass different quality gates to ensure quality, correctness and stability before it will be approved for production rollout. For that reason deployments to different environments have to be done. This usually means changes in configurations like service endpoints or timeout parameters, which must be possible without changing a components implementation and rebuilding the component. In Oracle Servicebus this can be achieved by using so called configuration files (aka customization files in OSB 11g). With those it is possible to consistently change service properties and configurations for implementation artefacts like proxy services, service pipelines and business services. Within a configuration file you define actions like replace or search and replace to adjust the corresponding configurations.

Generating a basic configuration file can be done using Servicebus console.

As it can be seen in the screenshot above the services that should be adjusted by the configuration file can be selected. Doing so, a file is generated containing replace rules for all configurations that are adjustable. Read the complete article here.

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