Mule框架提供了一個可升級的環境，可以把自己的業務組件部署在里面。Mule管理所有組件之間的交互，不管它們是在同一個虛擬機中還是在internet上，也不管底層使用的傳輸方式。

Mule圍繞著企業服務總線（ESB）架構進行設計，保證了不同的組件或者應用可以通過公共的消息總線進行交互，公共的消息總線一般是由JMS或者其他消息服務器來實現。

它的主要特點有：

?? 1.基于J2EE1.4的企業消息總線(ESB)和消息代理(broker).

?? 2.可插入的連接性:比如Jms,jdbc,tcp,udp,multicast,http,servlet,smtp,pop3, file,xmpp等.

?? 3.支持任何傳輸之上的異步，同步和請求響應事件處理機制.

?? 4.支持Axis或者Glue的Web Service.

?? 5.靈活的部署結構[Topologies]包括Client/Server, P2P, ESB 和Enterprise Service Network.

?? 6.與Spring 框架集成:可用作ESB 容器，也可以很容易的嵌入到Spring應用中.

?? 7.使用基于SEDA處理模型的高度可伸縮的企業服務器.

?? 8.強大的基于EIP模式的事件路由機制等.

幾個名詞：

1、Connectors ：就是支持不同協議的連接器。例如：Ｈｔｔｐ，ＦＴＰ，Ｍａｉｌ，Ｓｏａｐ，ＪＭＳ，ＭＱ等等。通常連接器有三種類型：只用于接收，只用于發送和兩者皆可。

? 2、EndPoints Address：終端地址，類似于jms://topic:myTopic這樣的東西。前面的ｊｍｓ就是連接器的類型。后面是各個連接器能識別的地址。這 個地址可以是接收器識別的地址，例如：jms://topic:myTopic表示對myTopic這個隊列進行監聽。也可以是發送器識別的地址。例如 pop3://user:password@mail.mycompany.com將某一個消息發送到遠程郵箱里面。注意這里的地址是你自己命名的，通常 不同的應用有不同的地址，例如某個應用是jms://topic:myTopic。另一個是jms://topic:myTopic2

? 3、UMO Components ：可以想象成這是ESB總線上的一個個芯片，控制器。在Mule里面，他們是一些POJO，負責接收消息，然后進行處理，在發送出去。例如，一個UMO它 的作用是監聽jms://topic:myTopic里面的消息，如果有，加以處理后發送到pop3: //user:password@mail.mycompany.com這個郵箱里面。顯而易見，UMO通過簡單的調用EndPoints Address來接收消息和轉發消息。它不需要知道自己按照什么協議接收和發送消息。這就是ESB的作用所在，即提供統一的總線接口。

Mule ESB

Mule ESB? is the world’s most widely used open source enterprise service bus, with over 1.5 million downloads and 2,000 production deployments. With Mule ESB’s simplified development model and lightweight architecture, Java programmers can be productive in minutes, easily creating and integrating application services. Mule ESB takes the complexity out of integration, enabling developers to easily build high-performance, multi-protocol interactions between heterogeneous systems and services.

Taking the “A” out of SOA

An ESB functions as a transit layer for carrying information, providing connectivity to a wide range of heterogeneous technology assets. The bus provides a set of capabilities to enable integration and service-oriented architecture (SOA), including service creation and mediation, routing, data transformation, and management of messages between endpoints. With Mule ESB, there is no need to embark on a top-down transformative SOA initiative with a lengthy payback horizon. Instead, Mule ESB works with any existing infrastructure, and IT organizations can immediately see value from the service-orientation and decoupled integration that Mule ESB provides. At the same time, the Mule ESB Enterprise suite includes enterprise-class features and tools that enable Mule ESB to scale up and meet the most demanding performance or reliability challenges posed by even the largest SOA implementations.

Features and Specifications

Mule ESB works with a wide variety of platform options and features a host of out-of-the-box functionality to provide the most comprehensive and flexible integration capabilities in the industry. In addition, Mule ESB Enterprise ships with a number of exclusive features that are essential for mission-critical production deployments.

OS	Linux Windows	Solaris AIX	HP-UX Mac OS X
Database	Derby	Oracle	MySQL
Containers	EJB 3	Spring	BPM
App Server	Standalone Tomcat Weblogic	WebSphere Geronimo JBoss	Resin Jetty
Transport	AS400 Data Queue Abdera Amazon SQS Axis BPM CICS CTG CXF Email FTP Hibernate HTTP/S	IMAP/S JCR JDBC Jersey Jetty/ Jetty SSL JMS LDAP Multicast POP3/S Quartz Restlet	RMI SalesForce SAP Servlet SMTP/S SOAP STDIO TCP UDP VM XMPP WSDL
Development Tools	Ant Eclipse Japex	Maven Mule IDE Profiler	Data Mapper (Eclipse, IDE, Oakland)
Security	Spring Security	Aceji JAAS	PGP SS4TLS
Flexible Deployment Topologies	ESB Client/ Server Peer-to-Peer	Enterprise Service Network (ESN)	Hub and Spoke Pipeline
Event Handling	Asynchronous SEDA	Streaming Synchronous	Transactions Routing Patterns
Web Services	Axis Atom CXF .NET Web Services	REST WS-Addressing WS-Policy WS-Security	WS-I BasicProfile WS-I SecurityProfile WSDL
Languages	Groovy Java Javascript	Jaxen Jython (Python)	JRuby JXPath
Data Formats	Atom Base64 encoded Byte arrays CSV	Encrypted GZIP Hex Strings HTML/ XHTML	Java Objects JSON EDI
Data Transformation	XSLT XQuery	Smooks	Oakland
Other	BPEL jBPM	JSR-223 (Scripting)	OGNL Filters Quartz

Exclusive in Mule ESB Enterprise

Premium Transports	High Performance JDBC WebSphere MQ
Performance ??????????? & Stability	High availability and failover Retry policies for self-healing connectivity Multi-resource transactions
Management Tools	Management and monitoring Patch management Migration tools
Documentation ??????????? & Support	Commercial-grade documentation Online knowledge base Technical support Platform certification

總結

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