By Akmal B. Chaudhri, Mary Loomis, Hewlett-Packard Professional Books
Myths approximately object-oriented databases are rampant. This booklet debunks them, so database directors and executives could make trained judgements in regards to the technology.This publication provides complete assurance of the "pros and cons" of object-oriented databases, assisting managers and directors make a decision even if to enforce this strong know-how. via 18 case reviews written through specialist practitioners, determine the best functions for OODBMS structures, and comprehend the specifications and technical tradeoffs concerned. The booklet additionally contains many never-before-published guidance, tips and methods for effectively designing and enforcing OODBMS on your organization.All database practitioners contemplating object-oriented database administration structures.
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Regardless of the type of resource represented by the message-driven bean, the instances of the bean type will be pooled in the same way as the JMS-MDBs. 2. The Activation Mechanism Unlike other enterprise beans, stateful session beans maintain state between method invocations. Conversational state represents the continuing conversation with the stateful session bean's client. The integrity of this conversational state needs to be maintained for the life of the bean's service to the client. Stateful session beans, unlike stateless session and message-driven beans, do not participate in instance pooling.
It is the EJB container's job to manage bean class instances as well as security and transaction demarcation. The EJB container has knowledge of the metadata defined as annotations on the bean class or as elements in the XML deployment descriptor. 0 Standard 39 authentication and authorization tasks. It also is responsible for managing the life cycle of the bean instance and routing the request from the proxy to the real bean class instance. After the EJB container has managed the life cycle of the bean instance, started any transactions, and performed its security checks, it routes the invocation to an actual bean instance.
These IDs are part of the session's conversational state, and they affect the behavior of subsequent method calls, such as the call to bookPassage( ) that makes the actual reservation. Conversational state is kept only as long as the client application is actively using the bean. Once the client shuts down or releases the TravelAgent EJB, the conversational state is lost forever. Stateful session beans are not shared among clients; they are dedicated to the same client for the life of the enterprise bean.