Best Java Training Insitute with 100% Learning & Implementation

What is Singleton Design Pattern?

Singleton design pattern comes into picture when we have to control the number of object instances that can be created per Class per JVM. It controls the number of instances that can be created per class. This pattern is especially used. say for example , when you want a Configuration Object that should be shared through out the entire application. You dont need to create many objects by reading the same configuration data. So, Singleton pattern helps you to maintain a single Configuration object for the entire application. Thus, it helps a lot in performance wise.

Available Vendor Products ( Singleton in Cluster )

Terracotta / Oracle Coherance A concept of in-memory object replication, which provides a singleton view across all JVMs.

JGroups:This tool is a toolkit for reliable messaging. It can be used to create clusters whose nodes can send messages to each other.

JBoss:HASingleton Service

A clustered singleton service is deployed on multiple nodes in a cluster but runs on only one of the nodes. The node running the singleton service is typically called the master node. When the master fails, another master is selected from the remaining nodes and the service is restarted on the new master.

WebLogic Singleton Service

Weblogic has the concept of Singleton Service where only instance runs within the cluster and all clients will look up to the same instance.

Websphere ObjectGrid

WebSphere supports the concept of singleton across cluster in the WebSphere XD version of the application servers.

Understand JVM internals like Class Loading, Reflection, Garbage Collection, Heap & Stack and Bytecode Instruction Set!

What you'll learn

Understand about the life of a class or interface inside JVM
Learn about Reflection
Learn about different memory areas in JVM like heap, stack and method area
Learn about some of the important Java Bytecode Instructions and understand Anatomy of a Class File by Using a Disassembler

Learn To:

Monitor, profile and tune your Java applications.
Use command line and visual tools to perform these tasks.
Get hands on practice with Visual VM, Java Mission Control, Flight Recorder and the NetBeans IDE.
Use these tools and techniques to analyze Java 7 and earlier JVMs.
Effectively apply tools like Java Mission Control and Flight Recorder to your daily work.

Target Audience

Administrator
Developer
Implementer
Systems Administrator

Course Objectives:

Monitor operating system performance on Solaris, Linux, and Windows
Describe basic principles of performance
Describe the operation of generational garbage collection
List the garbage collectors available in Java including the G1 collector
Monitor performance at the JVM and application level
Monitor and analyze Java application performance using Java Mission Control and Flight Recorder
Profile the performance of a Java application
Tune garbage collection in a Java application
Apply basic performance tuning principles to a Java application