Pattern: Test Message What happens, though, if a component is actively processing messages, but garbles outgoing messages due to an internal fault? A simple heartbeat mechanism will not detect this error condition because it operates only at a component level and is not aware of application message formats. Therefore, use Test Message to assure the… Read More Pattern: Test Message

Pattern: Smart Proxy How can you track messages on a service that publishes reply messages to the Return Address specified by the requestor? In order to track messages flowing through a service, we need to capture both request and reply messages. Intercepting a request message using a Wire Tap is easy enough. Intercepting reply messages… Read More Pattern: Smart Proxy

Pattern: Wire Tap How do you inspect messages that travel on a point-to-point channel? It can be very useful to see which messages traverse a channel. For example, for simple debugging purposes or to store messages in a Message Store. You can’t just add another listener to the Point-to-Point Channel because it would consume messages… Read More Pattern: Wire Tap

Pattern: Control Bus How can we effectively administer a messaging system that is distributed across multiple platforms and a wide geographic area? Use a Control Bus to manage an enterprise integration system. The Control Bus uses the same messaging mechanism used by the application data, but uses separate channels to transmit data that is relevant… Read More Pattern: Control Bus

System Management Messaging systems are asynchronous and distributed Multiple platforms Difficult to detect errors Difficult to configure (property file hell) How can we effectively administer a messaging system that is distributed across multiple platforms and a wide geographic area?  Business Activity Monitoring (BAM) solutions focus on the payload data contained in the message, for example… Read More System Management

Pattern: Scatter-Gather How do you maintain the overall message flow when a message needs to be sent to multiple recipients, each of which may send a reply? Use a Scatter-Gather that broadcasts a message to multiple recipients and re-aggregates the responses back into a single message. The Scatter-Gather routes a request message to the a… Read More Pattern: Scatter-Gather

Pattern: Aggregator For example, we want to select the best bid from a number of vendor responses or we want to bill the client for an order after all items have been pulled from the warehouse. How do we combine the results of individual, but related messages so that they can beprocessed as a whole?… Read More Pattern: Aggregator

Pattern: Splitter Composite Message Many messages passing through an integration solution consist of multiple elements. For example, an order placed by a customer consists of more than just a single line item. each line item may need to be handled by a different inventory system. Thus, we need to find an approach to process a… Read More Pattern: Splitter

Pattern: Content-Based Router For example, large e-tailers like Amazon allow you to order anything from books to chain saws and clothing. Depending on the type of item, the order may be processed by a different “behind-the-scenes” merchant’s order processing systems. Use a Content-Based Router to route each message to the correct recipient based on message… Read More Pattern: Content-Based Router