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Remote File Information
Starting with version 5.2, the FtpStreamingMessageSource (FTP Streaming Inbound Channel Adapter), FtpInboundFileSynchronizingMessageSource (FTP Inbound Channel Adapter) and "read"-commands of the FtpOutboundGateway (FTP Outbound Gateway) provide additional headers in the message to produce with an information about the remote file:
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FileHeaders.REMOTE_HOST_PORT- the host:port pair the remote session has been connected to during file transfer operation; -
FileHeaders.REMOTE_DIRECTORY- the remote directory the operation has been performed; -
FileHeaders.REMOTE_FILE- the remote file name; applicable only for single file operations.
Since the FtpInboundFileSynchronizingMessageSource doesn’t produce messages against remote files, but using a local copy, the AbstractInboundFileSynchronizer stores an information about remote file in the MetadataStore (which can be configured externally) in the URI style (protocol://host:port/remoteDirectory#remoteFileName) during synchronization operation.
This metadata is retrieved by the FtpInboundFileSynchronizingMessageSource when local file is polled.
When local file is deleted, it is recommended to remove its metadata entry.
The AbstractInboundFileSynchronizer provides a removeRemoteFileMetadata() callback for this purpose.
In addition, there is a setMetadataStorePrefix() to be used in the metadata keys.
It is recommended to have this prefix be different from the one used in the MetadataStore-based FileListFilter implementations, when the same MetadataStore instance is shared between these components, to avoid entry overriding because both filter and AbstractInboundFileSynchronizer use the same local file name for the metadata entry key.