Measures reported by EcpAppServerTest

One of the most powerful and unique features of Caché is the ability to efficiently distribute data and application logic among a number of server systems. The underlying technology behind this feature is the Enterprise Cache Protocol (ECP): a distributed data caching architecture that manages the distribution of data and locks among a heterogeneous network of server systems. Unlike other "multi-tier" architectures, ECP is primarily a configuration option. That is, you do not have to use special code or development techniques to create distributed database applications. Furthermore, the architecture and operation of ECP is conceptually simple. ECP provides a way to efficiently share data, locks, and executable code among multiple Caché systems. Data and code are stored remotely, but are cached locally to provide efficient access with minimal network traffic. An ECP configuration consists of a number Caché systems that are visible to one another across a TCP/IP-based network. There are two roles a Caché system can play in an ECP configuration:

• ECP Data Server - a Caché system that is providing data for one or more ECP application server systems.
• ECP Application Server - a Caché system that is consuming data provided by one or more ECP data server systems.

A Caché system can simultaneously act as both an ECP data server and an ECP application server. However, one Caché instance cannot act as an ECP data server for the data it receives as an application server of another ECP data server.

• Establishing connections to a specific ECP data server whenever an application requests data that is stored on that server.
• Tracking the status of all connections to ECP data servers. If a connection is broken, or encounters any trouble, the ECP application server attempts to recover the connection.
• Maintaining, in its cache, data retrieved across the network

The EcpAppServerTest monitors the caching and data management functions performed by the ECP application server.