Queue Messaging Systems Sample Clauses

Queue Messaging Systems. RabbitMQ. It is an open source Enterprise Messaging Queue server from VMWare, written in the Erlang language. Since it is one of the main implemen- tations of the AMQP protocol (Advanced Messaging Queue Protocol), its archi- tecture is broker-based, so every message is delivered to a central entity (Ex- change) that routes it to the correct queue. RabbitMQ nodes can be organized in clusters, in order to achieve scalability and availability. Queues can be replicated (mirrored) in an active/passive fashion, with one master node and at least one slave node: if the master fails, a new one is elected among all slaves and the system continues to operate. RabbitMQ built-in clustering is not partition tolerant (since it ensures strong consistency and availability), so its usage is preferable on LAN environments, where con- nectivity between nodes can be considered stable. On WAN environments, RabbitMQ brokers can be distributed on different nodes by using the concepts of federation and shovel, that basically allows a broker to receive messages published to another broker, connected by the AMQP protocol. Of course, bro- kers can still be clustered locally. In these scenarios, partition tolerance and availability are achieved and, hence, only the eventual consistency can be globally guaranteed. Queues could be made durable, so that the containing messages are persisted on disk even in case of failures, on the Mnesia DBMS, written in Erlang as well. RabbitMQ runs on all major operation systems and clients for it could be written using several programming languages, such as Java, .NET, Ruby, Python, Er- lang, PHP and C/C++. In addition, its setup is fast and easy. • Apache QPid. Part of the Apache Software Foundation, it is an open source En- terprise Messaging system. Like RabbitMQ, it implements the AMQP protocol, so its architecture is broker-based. It provides brokers written in C++ and Java languages, with different features.
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