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flows unit of work
Several components can deal with multiple units of work in the execution of a given flow. As an example, the Text File Reader can take one or more inbound messages that specify the path and name of a file to read. In this instance, the text file reader receives three messages, and will read data from the three files specified in each input message. When the text file reader completes reading of a given file and sends all data in output messages, it will send a control message that indicates it is complete with the given "unit of work" (i.e. reading the file that was specified by the input message). Downstream components can utilize that control message in different ways depending on the implementation and configuration of the downstream component. As an example, many components have a "Run When" configuration option which can be set to "Per Message" or "Per Unit of Work". Setting the "Run When" option to "Per Unit of Work" will enable the component to run when a unit of work control message is received". Setting the "Run When" option to "Per Message" will enable the component to run each time any data message is received.