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This section includes the following topics:
The Change Center allows for team collaboration when services and metadata are being configured in AquaLogic Service Bus. Each user works in a sandbox "session" until the user is ready to check in the working configuration to the core configuration of the bus. Change center provides multiple levels of undo, and visibility into conflicts, as multiple users work on the configuration.
The following table lists the pages you can access from the Change Center module. The tasks and help topics associated with each are provided.
| Note: | Most of the Change Center pages display different information based on whether you are in a session (that is, you have clicked Create or Edit in the Change Center) or outside a session. For example, in a session, the View Configuration Changes page lists all the changes you have made in that session; outside a session, the page lists all session activations. |
The Change Center module is the starting point for using the AquaLogic Service Bus Console to make changes to your configuration. To make any changes using the console, you must use the Change Center to start a session.
Starting the session enables you to make changes using the AquaLogic Service Bus Console. For example, you can create a resource, edit a resource, delete a resource, or import a configuration.
| Note: | From the left navigation pane, click Discard at any time during the session to delete the changes you have made so far in the current session. The session also ends. |
From the left navigation pane, click Exit under Change Center at any time to exit the session. However, the session does not end. You can click Edit from the left navigation pane to return to the session and continue making changes. This behavior also applies if you click Logout to log out of the Console or close your browser. The session and all changes that you have made in the session persist even if you log out of the console or the server is restarted.
Finding and Replacing Environment Values
Viewing and Resolving Conflicts
The Activate Session page allows you to activate sessions. The page is displayed when you click Activate in the Change Center. To learn more, see Using the Change Center.
| Note: | You will not be able to activate the session until you have viewed all conflicts. If new conflicts arise while you view the existing conflicts, before you activate, a message pops up informing you of the new conflicts. |
| Note: | Creating a session, and discarding a session proceed regardless of other activity in the system. However, if another session is in the process of being activated, the Session Activation page displays an error indicating the user that has the pending Weblogic Server changes. |
Finding and Replacing Environment Values
Viewing and Resolving Conflicts
The View Configuration Changes page displays different information based on whether you are in a session (that is, you have clicked Create or Edit in the Change Center) or outside a session. When you are in a session, the page displays a list of configuration changes that you have made during the current session. To learn more, see To View Configuration Changes in a Session. When you are outside a session, the page displays a list of configuration changes that were caused by previous session activations. To learn more, see To View Configuration Changes Caused by Session Activations.
A description of the task that was implemented. The task is a link to the Task Details page. To learn more, see Viewing Task Details.
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As a result of undoing a task, the object of the task reverts to the state it was in before the task in question was performed. Note however, that any tasks that were performed on the same object after the task that you undo are also undone. To learn more, see Undoing a Task.
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A description of the session that was activated. The task is a link to the Task Details page, which displays the operations that were performed in the session. To learn more, see Viewing Task Details.
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Click the Undo icon to reverse the session activation and the operations performed in that session. You can undo session activations in any order.
Click the Undo into Session icon to create a new session pre-populated with the tasks needed to undo the changes activated in the session. To learn more, see Undoing a Task.
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In the View Configuration Changes page, you can purge sessions activated over a specific period, delimited by start and end dates. This action can only be performed out of session.
| WARNING: | Purging session activation history involves deleting data that enables multiple levels of undo. In other words, if you purge session activation history for a specific period, you will not be able to undo sessions activated during that period. |
The session activation history for all sessions between the dates specified will be deleted from the AquaLogic Service Bus.
Finding and Replacing Environment Values
Viewing and Resolving Conflicts
The View Configuration Changes page allows you to undo tasks that you have performed in your AquaLogic Service Bus configuration during your current session, and allows you to undo session activations outside of a session. AquaLogic Service Bus allows you to undo multiple levels of session activation, constrained only by your system resources. To learn more about this page, see Viewing Configuration Changes.
| Note: | If you upgrade from AquaLogic Service Bus version 2.1 to version 2.5, you will not be able to undo sessions activated before the upgrade. Sessions activated after the upgrade will be available in the session activation history, for undo. |
| Note: | You can undo any change in the current session. However after that, if you change your mind, you can undo the undo, or if you again change your mind, you can undo the undo that undid a previous undo, and so on. |
You can undo tasks in any order (provided that individual undo actions result in valid data). The undo operation sets the value of a resource to the value it had before the change to that resource.
In the case that the task that is being undone was one that created an object, there is no previous state to which an object can be returned—in other words, no object existed before this task was performed. Effectively, the undo operation deletes the new object from the session. In this case, errors occur for the objects that reference the one being deleted. You can view such errors on the View Conflicts page in the Change Center.
When you are not working in a session, you can access the View Configuration Changes page to see the sessions that were previously activated. You can undo these sessions. The system does not allow you to undo a session that was previously activated if an error in the run time configuration would result from the undo action. For example, if you attempt to undo a session activation that results in the removal of an object that is being referenced by another object, that undo action is disallowed.
| Note: | It is possible to undo an undo action. In the Options column of the Undo of [task], click the Undo icon. AquaLogic Service Bus supports unlimited undo. This means you can undo the undo that undid a previous undo, and so on. |
| Note: | If semantic errors result from undoing a session activation, you are prevented from doing the undo. However there is an alternative in this case. You can undo the session activation and have the changes put into a new session. You can then fix the semantic errors and activate the session. You can also use this capability of undoing into a session to explore the ramifications of a session activation undo. You can examine all the changes that result, and decide if you really want to do the undo. If you decide that you really want to, you can activate the session. |
Finding and Replacing Environment Values
Viewing and Resolving Conflicts
The Task Details page allows you to view details of a specific change you made in the current session if you are in the session, and view details of specific changes you made in sessions that have been activated if you are outside a session.
Finding and Replacing Environment Values
The View All Sessions page allows you to view all existing sessions within the AquaLogic Service Bus Console. You can view these sessions if you are currently in a session or outside a session.
| Note: | You can only view all sessions if you are using the Administrator role. |
| Note: | The same user logged in with multiple browsers is not supported. It causes unpredictable behavior in the console. |
Finding and Replacing Environment Values
Viewing and Resolving Conflicts
The Find and Replace page allows you to search for environment values that differ between different domains. Environment values (or environment dependent attributes) are certain predefined fields in the configuration data whose values are very likely to change when you move your configuration from one domain to another (for example, from test to production). There are two types of environment values in this release, which are found in the business service and proxy service definitions: URIs, and File/Directory names. The only difference between an environment value and a non-environment value is that you can change environment values en masse, using the Find and Replace page.
| Note: | You may need to modify many other objects when you move your configuration between domains. You must use the individual edit pages to change those values. |
This page behaves differently based on whether or not you are in a session. If you are in a session, you can find and replace environment values. However, if you are outside a session, you can find environment values only; Replace All is disabled.
Note: Select the Options checkbox if you want to locate only items changed in your current session, and select the environment value type for which you want to search—URI, IMAP Move Folder, Mail Server Host, JNDI Provider URL, SMTP Server URL, UDDI Registry URL, or File Path.
A list of relevant values is displayed, which includes the Owner, Type, and the Environment Value columns.
All occurrences of the environment value you entered in the Find field are replaced with the environment value you entered in the Replace field.
Viewing and Resolving Conflicts
The View Conflicts page allows you to view diagnostic messages about errors in your configuration, and to view and resolve conflicts between changes made in your session and other activated sessions. The view conflicts link also displays the number of live conflicts in the session.
A description of the conflict. To resolve the conflict, see Resolve Conflicts.
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If the object to which you make changes in a session has changed in the run time since you began the Edit of the current session, the following information is displayed.
To resolve a conflict, use the information provided in the Messages column (as described in Table 2-6) to understand the problem, and then edit the object that is causing the conflict to fix the problem.
For the scenario in which you have a concurrent update conflict—that is, a conflict that occurs if a resource is modified in the current session that has already been modified and activated by another session (as described in Table 2-7), you can resolve the conflict in one of two ways:
When you attempt to activate a session with a JMS endpoint URI on another server (a single server other than the one on which you are working, or a managed server in a cluster), ensure that the destination server is available.
AquaLogic Service Bus does not allow registration of proxy services with JMS transport if the JMS endpoint URL specifies a destination that is unreachable. In other words, for JMS services, AquaLogic Service Bus checks if the specified connection factory exists; if it does not, a session activation error occurs.
Finding and Replacing Environment Values
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