软件架构设计与式.ppt

Advantages of the 2 Tier Architecture Simplicity: By taking advantage of the ability to run internal broker threads, the 2 Tier approach avoids the complexity involved in designing and implementing a stand-alone broker. Implementing a broker thread is as simple as creating a new instance of a class. Distributed Broker:The 2 Tier approach benefits from the ability to easily distribute the brokering task between as well as within application components. Fault tolerance:A distributed broker design is fault tolerant -- a failure in a single application component affects only its own database connection pool. Flexible Load Balancing:The 2 Tier architecture allows for a large degree of flexibility in the load balancing largely due to its distributed nature. Customized Housekeeping:Because broker threads can be scaled and distributed freely, the designer of an application has enormous flexibility in shaping the system to handle new and complex situations. * * Microkernel模式 ?/community/wiki/JBossMicrokernel The JBoss Microkernel is a set of MBeans that runs on top of JBossMX. It has been designed to be totally modular from the ground up. Support classes exists to extend the notion of an MBean into a Service or Deployer ? Features Small memory footprint Classloading Management - everything except the kernel is HotDeployable Pluggable Deployers - you can deploy anything from your own custom config Fully Configurable - the bootstrap process is both configurable and replaceable NetBoot - ability to bootstrap from a tiny resident loader Lifecycle and dependency management - full two phase lifecycle Component configuration - using JMX and PropertyEditors Management - it is based JMX on a Bus (the MBeanServer) What is the JBoss Microkernel? * Architecture Overview - a brief overview of the architecture Source Tree - a brief overview of the source tree Bootstrap - a quick walkthrough of the bootstrap ?Configuration Parameters - parameters passed to the JBoss star