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Currently, you can use this Resequencer pattern only through the Management Console of WSO2 Enterprise Service Bus (ESB) 4.9.0 via the |
The Resequence Message Store is used to store a stream of related but out-of-sequence messages to put them back into the correct order. It collects and re-orders the stored messages based on a defined sequence number derived from some part of the message, so that they can be published to the output channel in a specific order. This is advantageous specially when the order of message delivery is important to avoid some messages arriving earlier than others.
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In the WSO2 ESB Management Console, click Main, click Add Message Stores in the Message Stores Service Bus menu, and then click Resequence Message Store, to configure it as follows.<ADD_THE_SCREENSHOT>.
Enter the configuration details in the below screen.
When you add a Resequence Message Store, it is required to specify values for the following:
- Name: A unique name for the RabbitMQ message store.
- Database Table: Table name of the database in which, messages will be stored.
- Connection Information: If the database is connected via a Carbon datasource or via a connection pool.
- Driver: The class name of the database driver.
- Url: URL of the database.
- User: The username to access the database.
- Password: The password to access the database.
- Resequence Timeout (Seconds): The time the Message Processor waits for a message, which is missing to reorder them based on a specified order.
- Sequence ID Path: The path from which, the Store identifies the sequence ID from the message content.
The following is a sample ESB configuration of the Resequence Message Store.
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| Property Name | Description | Required | Possible Values |
|---|---|---|---|
store.resequence.timeout | The time the Processor waits for a message, which is missing to reorder them based on a specified order. If the current message sequence is 3, its predecessor would be 2 and the successor would be 4, and thereby, if 4 is not present, then there is a gap in the sequence. Therefore, the processor waits until the specified set time-out exceeds, and selects the next minimum sequence ID available as the predecessor. However, the time-out will be a rough estimate. The durations could vary depending on the load of the machine. | Yes | Specify a positive integer for the count and the timeout in seconds. If you specify the count as -1, then the processor will wait indefinitely until the correct sequence ID is present to fill the gap. |
store.producer.guaranteed.delivery.enable | Whether you want to enable guaranteed delivery or not. For more information, see Guaranteed Delivery with Failover Message Store and Scheduled Failover Message Forwarding Processor. | No | True/False |
store.failover.message.store.name | The name of the Message Store used if the original message store fails. For more information, see Guaranteed Delivery with Failover Message Store and Scheduled Failover Message Forwarding Processor. | No | An appropriate String value |
store.resequence.id.path | The path from which, the Store identifies the sequence ID from the message content. The path could be either XPath or JSON. You can specify it in the expression field. | Yes | Set a positive integer as the sequence ID. The store expects the sequence ID to start from 1. |
store.jdbc.password | The password to access the database. | No | An appropriate String value |
store.jdbc.driver | The class name of the database driver. | Yes | An appropriate String value |
store.jdbc.username | The user name username to access the database. | Yes | An appropriate String value |
store.jdbc.connection.url | The database URL. | Yes | An appropriate String value of a URL. |
store.jdbc.table | Table name of the database in which, messages will be stored. | Yes | An appropriate String value |
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