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Chapter 11. Gateway

Abstract

The Fabric Gateway provides a TCP and HTTP/S gateway for discovery, load balancing and failover of services running in a fabric. The Fabric Gateway enables you to use standard HTTP URLs to access Web applications or Web services running in a fabric. In JBoss A-MQ, messaging clients can discover and connect to brokers over any supported messaging protocol (OpenWire, STOMP, MQTT, AMQP or WebSockets), letting the gateway handle the connection management to the real services running inside the fabric.
Warning
The Fabric Gateway is a technical preview only, and is not supported in JBoss A-MQ 6.1.

11.1. Gateway Architecture
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Deployment strategies
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There are two main deployment strategies for a gateway:
  • Run the gateway on each machine that needs to discover services and communicate with it through localhost. In this case, you do not need to hard code any host names in your messaging or Web clients and the connection to the gateway on localhost is nice and fast.
  • Run the gateway on one or more known hosts using DNS or VIP load balancing (mapping host names to machines). In thise case, you can use a fixed host name for all your services

How the gateway works
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The gateway monitors and detects any changes in the ZooKeeper registry for all Web applications, Web services, servlets and message brokers. For all of the registered services, the gateway applies mapping rules to figure out how to expose those services through TCP or HTTP.
The ZooKeeper registry is automatically populated by Fabric when you deploy Web archives (WARs) or CXF based Web services.
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