By Scott Cranton, Jakub Korab
Apache Camel is a de-facto common for constructing integrations in Java, and is predicated on well-understood firm Integration styles. it truly is used inside of many advertisement and open resource integration items. Camel makes universal integration initiatives effortless whereas nonetheless offering the developer with the capacity to customise the framework while the location calls for it. projects comparable to protocol mediation, message routing and transformation, and auditing are universal usages of Camel. Apache Camel Developer's Cookbook offers countless numbers of top perform counsel for utilizing Apache Camel in a structure that is helping you construct your Camel initiatives.
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Additional resources for Apache Camel Developer's Cookbook
The camelContext element is itself a Spring managed object that can optionally be given an ID and treated like any other bean. The preceding example shows Camel's XML DSL being used. One of the nice things about the DSL is that an XML schema is used to define it. This means that it is possible for your IDE to provide you with code completion. info Chapter 1 It is not mandatory to use the XML DSL with Spring. It is possible to use the Java DSL instead, or alongside routes defined through the XML DSL.
Camel provides route policies out of the box for throttling routes (ThrottlingInflightRoutePolicy), defining uptime through a timer (SimpleScheduledRoutePolicy), and cron expressions (CronScheduledRoutePolicy). info 2 Message Routing In this chapter, we will cover the following recipes: ff Content Based Routing ff Filtering out unwanted messages ff Wire Tap – sending a copy of the message elsewhere ff Multicast – routing the same message to many endpoints ff Recipient List – routing a message to a list of endpoints ff Throttler – restricting the number of messages flowing to an endpoint ff Request-response route sending a one-way message ff One-way route waiting on a request-response endpoint ff Dynamic Routing – making routing decisions at runtime ff Load balancing across a number of endpoints ff Routing Slip – routing a message to a fixed list of endpoints Introduction This chapter explains how to make use of Camel's built-in EIPs (Enterprise Integration Patterns) to write typical integration logic.
An SPI encapsulates a single behavior, such as a route naming strategy (Camel gives your routes sensible names if you do not do so explicitly). To override the default behavior, you provide your own implementation of the SPI class and set it on the CamelContext object. The context allows you to define the following, amongst others: ff Listeners that are notified of Camel lifecycle events ff Naming strategies for routes, route nodes, and JMX ff Strategies for shutting down the application gracefully ff Mechanisms for managing thread pools It is therefore worthwhile getting familiar with the options that this class gives you by going over the Javadocs.