Messaging in Java

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11 Messaging
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Topic Exchange
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update#
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A topic exchange sends messages based on patterns
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Two more interesting examples can be drawn from this type of routing key For example, say that the first token represents an operation such as update, create, or destroy The tokens after the first can represent the fields that were included in the
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operation The message would include the old and new values of the fields in the operation Thus, if you wanted to get messages for any modification that includes the name field, you could bind with #name#, which means zero or more tokens with a name token followed by zero or more tokens To get messages only concerning updates to the name field, you bind with update#name# The topic exchange is the most powerful of the three exchange types covered here It could be used entirely in place of direct and fanout exchanges However, the performance of direct and fanout exchanges is generally better Which type of exchange is best depends on the setup The smaller the number of bindings on an exchange, the less performance is an issue As you add more bindings to an exchange, more checks must be performed for each incoming message For this reason, it is sometimes a good idea to create multiple exchanges or one for each service that requires messaging capabilities
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Durability refers to the ability for exchanges or queues to survive server restarts or crashes Persistence refers to whether messages will be kept on disk and thus able to survive server restarts or crashes In RabbitMQ, durability can be set on the queues and exchanges, while persistence can be set on the messages In addition, consumers can be configured to tell the server that an acknowledgment for message processing is required Which combination you want depends on the processing needs
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Durable Exchanges and Queues
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Exchanges and queues that are marked as durable still exist after a restart However, it is important to note that just because a queue is durable does not mean that the messages in the queue are also durable (or persistent) It is also worth noting that if an exchange is marked as durable, only durable queues can be bound to the exchange and vice versa
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Messages can be marked as persistent This means that the messaging server writes a copy to disk and keeps it around until it is pushed off to a consumer If a message is not persistent, it exists only in memory and disappears if there is a server restart before the message can be processed Generally, persistence slows performance, so it is recommended only in situations where persistence is a requirement
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11 Messaging
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Message Acknowledgments
In AMQP, messages are pushed to consumers These pushes generally happen asynchronously, so it is possible for a consumer to have multiple messages waiting to be processed If the consumer process experiences a crash, the messages on the consumer can be lost For this reason, it s a good idea to turn on acknowledgments To do this, the consumer tells the AMQP server that each message sent must be acknowledged If it is not acknowledged and the consumer dies, the AMQP server pushes the message to the next available consumer There are many different settings in AMQP, and it can be difficult to understand them all together When you use the messaging server to convey data that has not been saved elsewhere, it is a good idea to have durable exchanges and queues, have persistent messages, and have acknowledgments turned on If data is being stored elsewhere and the messages can be resent after a critical server failure, a good configuration may be to have durable exchanges and queues, memory-only messages, and acknowledgments It s a good idea to have acknowledgments turned on at all times to guard against the possibility of a consumer having an unexpected restart or crash The AMQP server will generally be more reliable than the consumers