34 results about "Entity Bean" patented technology

Servers in a network cluster can each store a copy of a data item in local cache, providing read access to these copies through read-only entity beans. The original data item in the database can be updated through a read / write entity bean one of the cluster servers. That cluster server has access to an invalidation target, which contains identification information relating to copies of the data item stored on servers in the cluster. Once the read / write bean updates the data item in the database, an invalidate request can be sent or multicast to all cluster members, or to any read-only bean or server contained in the invalidation target. Each server or read-only bean receiving the request knows to drop any copy of the data item in local cache, and can request a current copy of the data item from the database.

A generic product finder system that provides the capability of managing and performing searches on configurable products in a J2EE application. The generic product finder system includes a manager component for performing searches in response to a search query; a product component for persisting a plurality of product information and interacting with the manger component in conducting searches of the product information; a product metadata component that interacts with the manager component for defining a product; and a search configuration component that interacts with the manager component for constructing a set of search rules in a product search configuration. Internally, the product finder system represents products with a specification divided into parameters representing characteristics and optional attributes. This specification exists in a generic state by the use of Java objects. Multiple product specifications may co-exist and their information is persisted by the use of entity beans. The generic product also contains a session bean that acts as manager and single point-of-entry to the product information. Since the products are maintained in a generic form, search rules can be constructed and applied to the product set to perform complex queries.

A method and system for achieving time-awareness in the highly available, fault-tolerant execution of components in a distributed computing system, without requiring the writer of these components to explicitly write code (such as entity beans or database transactions) to make component state persistent. It is achieved by converting the intrinsically non-deterministic behavior of the distributed system to a deterministic behavior, thus enabling state recovery to be achieved by advantageously efficient checkpoint-replay techniques. The system is deterministic by repeating the execution of the receiving component by processing the messages in the same order as their associated timestamps and time-aware by allowing adjustment of message execution based on time.

A method and system for achieving time-awareness in the highly available, fault-tolerant execution of components in a distributed computing system, without requiring the writer of these components to explicitly write code (such as entity beans or database transactions) to make component state persistent. It is achieved by converting the intrinsically non-deterministic behavior of the distributed system to a deterministic behavior, thus enabling state recovery to be achieved by advantageously efficient checkpoint-replay techniques. The system is deterministic by repeating the execution of the receiving component by processing the messages in the same order as their associated timestamps and time-aware by allowing adjustment of message execution based on time.

A method, apparatus, and computer instructions are provided for implementing container managed uses, ownerships, and references in an enterprise JavaBean™ environment. A user may specify a uses, ownership, reference relationships between entity beans and sessions in a deployment descriptor file. When the file is processed, the present embodiment generates methods on the entity beans and allows the container to recognize the relationships, such that the user may access the session beans based on the specified relationships.

Transactions are granted concurrent access to a data item through the use of an optimistic concurrency algorithm. Each transaction gets its own instance of the data item, such as in a cache or in an entity bean, such that it is not necessary to lock the data. The instances can come from the data or from other instances. When a transaction updates the data item, the optimistic concurrency algorithm ensures that the other instances are notified that the data item has been changed and that it is necessary to read a new instance, from the database or from an updated instance. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

A method, apparatus, and computer instructions are provided for implementing container managed uses, ownerships, and references in an enterprise JavaBean™ environment. A user may specify a uses, ownership, reference relationships between entity beans and sessions in a deployment descriptor file. When the file is processed, the present embodiment generates methods on the entity beans and allows the container to recognize the relationships, such that the user may access the session beans based on the specified relationships.