Abstract: A method and system for a delta page protocol for caching, replication, and client/server networking. Measurement data may be received by a logger application on a first computer, and written to shared memory sections in a modular fashion, including creating one or more header records to indicate a changed status. Each shared memory section may be independently accessible by a trender application executing in a second computer. In response to a query from the trender, the first computer may send a single message, a delta page. The header record may be used to determine the changed status of data sections. A single write operation may store the data values in a memory of the second computer. The trender may then read the first plurality of data values. The trender may present the retrieved data or requested data on a display. The logging and trending may be performed substantially concurrently.

Abstract: A method and system for modular storage of measurement streams using a hierarchy of stream-processing objects. A first application may log measurement data of a plurality of data types to a shared memory location on a first computer, independent of the data type. Both the data and an index to the data may be logged. A second application may trend the data substantially concurrently as the data is logged. Both applications may include a plurality of filter objects, including a hierarchy of stream processing objects, which may operate to log/trend the data. Trending may include: (1) generating a query; (2) determining the location using the index; (3) accessing the data from the shared memory; and (4) displaying the data. The data may be replicated to an archival database, independent of the type of data. The replicated data may be transmitted to a plurality of computers.

Abstract: A method and system for a delta page protocol for caching, replication, and client/server networking. Measurement data may be received by a logger application on a first computer, and written to shared memory sections in a modular fashion, including creating one or more header records to indicate a changed status. Each shared memory section may be independently accessible by a trender application executing in a second computer. In response to a query from the trender, the first computer may send a single message, a delta page. The header record may be used to determine the changed status of data sections. A single write operation may store the data values in a memory of the second computer. The trender may then read the first plurality of data values. The trender may present the retrieved data or requested data on a display. The logging and trending may be performed substantially concurrently.

Abstract: A method and system for modular storage of measurement streams using a hierarchy of stream-processing objects. A first application may log measurement data of a plurality of data types to a shared memory location on a first computer, independent of the data type. Both the data and an index to the data may be logged. A second application may trend the data substantially concurrently as the data is logged. Both applications may include a plurality of filter objects, including a hierarchy of stream processing objects, which may operate to log/trend the data. Trending may include: (1) generating a query; (2) determining the location using the index; (3) accessing the data from the shared memory; and (4) displaying the data. The data may be replicated to an archival database, independent of the type of data. The replicated data may be transmitted to a plurality of computers.