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filePoller

This component periodically checks the "inbox" directory - it recursively scans the inbox directory and subdirectories for new files. If there is a file present, it adds the file to the "workingSet" of the workManager. The workManger dispatches to a worker thread, which calls back into the filePoller to process a file from the workingSet. Processing consists of marshalling the file (streaming it from disk into a normalized message). The normalized message is sent over the Normalized Message Router (NMR) to the fileSender component per the specified "destinationService" which is specified in the servicmix.xml file in the filePoller component. In this case the "destinationService" is the fileSender component. Finally, after it has been processed, the filePoller deletes the file from the source directory.

fileSender

this This component listens for normalized messages. The messages it receives are the files that filePoller has transferred to it via the NMR. It converts the normalized message to its original file format by processing it and sending it to the destination directory, in this case the outbox directory. This component creates the filename to copy the file to by concatenating the string "sample_" with the process id following by ".xml". Therefore, the source file name from the inbox directory is not the destination file name in the outbox directory.

workManager

This bean is used by the filePoller to increase the throughput of the application. The workManager is a thread pool whose size can be adjusted declaratively in the servicemix.xml file. The workManager processes the "workingSet." The workingSet is the collection of files to be transfered over the NMR. The workManager continually dispatches a unit of work, i.e., a file transfer, to one of the threads in its pool, until the workingSet has been fully transferedtransferred.