【Java.Apache.Camel】

Apache Camel —— 一種Enterprise Integration Patterns的實現； 參考《企業整合模式：設計、構建及部署訊息傳遞解決方案》。

提供訊息路由route:準系統是接受訊息、處理訊息和指派訊息。

通過Java領特定領域語言DSL（基於Camel 提供的java API, 或者Spring設定檔等）來配置路由和處理規則。其核心的思想是從一個from源頭得到資料，通過Processor處理，再發到另一個to目的地。

Camel使用URIs表示不同的訊息傳輸模型。

目前支援的URIs類型：

disruptor://

file://

ftp://

hbase://

hdfs://

http://

ibatis://

jdbc://

jms://

jmx://

jpa://

ldap://

quartz://

rmi://

quickfix://

smtp://

sql:

zookeeper:

spring-redis://

,.etc ... ...

第三方擴充：

activemq://

hibernate://

zeromq://

,.etc ... ...

E.g.

E1: ftp - 檔案系統路由

CamelContext context = new DefaultCamelContext();  context.addRoutes(new RouteBuilder() {      public void configure() {                                    from("ftp://localhost/inbox?username=yorker&password=123456").to(          "file:d:/temp/outbox");      }  });  context.start();  boolean loop = true;  while (loop) {      Thread.sleep(25000);  }    context.stop(); 

E2: jms路由

private static String user = ActiveMQConnection.DEFAULT_USER;  private static String password = ActiveMQConnection.DEFAULT_PASSWORD;  private static String url = ActiveMQConnection.DEFAULT_BROKER_URL;    public static void main(String args[]) throws Exception {              CamelContext context = new DefaultCamelContext();              ConnectionFactory connectionFactory =           new ActiveMQConnectionFactory(user, password, url);      context.addComponent("jms",          JmsComponent.jmsComponentAutoAcknowledge(connectionFactory));      System.out.println(url + " " + user + password);              context.addRoutes(new RouteBuilder() {          public void configure() {                              from("file:d:/temp/inbox").to(              "jms:queue:TOOL.DEFAULT");          }      });      context.start();      boolean loop = true;      while (loop) {          Thread.sleep(25000);      }        context.stop();  }  

E3: http路由

public class HttpPollWithQuartzCamel {      public static void main(String args[]) throws Exception {          CamelContext context = new DefaultCamelContext();          context.addRoutes(new RouteBuilder() {              public void configure() {                                  from("quartz://report?cron=10 * * * * ?&stateful=true")                  .to("http://localhost:8080/prjWeb/test.camelreq")                  .to("file:d:/temp/outbox?fileName=http.csv");                  );              }          });          context.start();          boolean loop = true;          while (loop) {              Thread.sleep(25000);          }          context.stop();      }  }