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filePoller

periodically checks the "inbox" directory and recursively scans the inbox directory and subdirectories for new files. If there is a file present, it converts the file 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 and sends it ). 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 compoenent.

fileSender

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.

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 transfered.