Sending the read request

After you construct an OpenFileForReading event, emit it to the "FILE" channel. For example:

com.apama.file.OpenFileForReading openFileWeWantToRead :=
new com.apama.file.OpenFileForReading;

//populate the openFileWeWantToRead event
//..
//..
emit openFileWeWantToRead to "FILE";

Emitting an OpenFileForReading event from EPL code signals the File adapter to open the file. If the open operation is successful, the File adapter returns a FileHandle event.

The sessionId is the most important field; all communication related to this file references this value.

If the open operation is unsuccessful, the File adapter returns a FileError event.

See the com.apama.file package in the API Reference for EPL (ApamaDoc) for detailed information on the FileHandle and FileError events.