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This article mainly introduces how to use EJB to achieve the singleton model, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

How to use EJB to achieve singleton mode

Singleton pattern is a very useful design pattern in software engineering.

Simply put, singleton is an instance of a class that has only one global entry.

Typically, you will use the static reserved word to create when you define a class in Java

A singleton. However, one of the limitations of EJB is that it cannot be found in your

Fields in bean that use static. This hinders the use of singleton mode

Use it. But we still like to use singleton mode, how to do it?

The answer is JNDI. You can use JNDI to store arbitrary objects to

Simulates singleton mode. If all your objects know that in a JNDI tree

A single, well-known location in which a specific object is kept

They will effectively treat that object as a separate instance. Can you

This is done by binding a Rmi_IIOP stub to a JNDI tree.

Any client code will get a copy of that remote stub, and

Each copy will refer back to the same RMI-IIOP server object.

The drawback of this model is that you leave the EJB sandbox and downgrade to pass

RMI-IIOP, and you have lost all the services provided by EJB.

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