/**
* Shutdown the file loader and release all resources
*
* @param immediate boolean
*/
public void shutdownLoader(boolean immediate) {
// Shutdown the background load/save thread pool
if (m_backgroundLoader != null) m_backgroundLoader.shutdownThreads();
}
/**
* Request file data to be loaded/saved
*
* @param req FileRequest
*/
public void queueFileRequest(FileRequest req) {
// Pass the request to the background load/save thread pool
m_backgroundLoader.queueFileRequest(req);
}
/**
* Start the file loader
*
* @param ctx DeviceContext
*/
public void startLoader(DeviceContext ctx) {
// Get the file state cache from the context
m_stateCache = getContext().getStateCache();
// Add the file loader as a file state listener so that we can cleanup temporary data files
m_stateCache.addStateListener(this);
// Get the database interface
DBQueueInterface dbQueue = null;
if (getContext().getDBInterface() instanceof DBQueueInterface)
dbQueue = (DBQueueInterface) getContext().getDBInterface();
else throw new RuntimeException("Database interface does not implement queue interface");
// Perform a queue cleanup before starting the thread pool. This will check the temporary cache
// area and delete
// files that are not part of a queued save/transaction save request.
FileRequestQueue recoveredQueue = null;
try {
// Cleanup the temporary cache area and queue
recoveredQueue =
dbQueue.performQueueCleanup(m_tempDir, TempDirPrefix, TempFilePrefix, JarFilePrefix);
// DEBUG
if (recoveredQueue != null && Debug.EnableInfo && hasDebug())
Debug.println(
"[DBLoader] Cleanup recovered "
+ recoveredQueue.numberOfRequests()
+ " pending save files");
} catch (DBException ex) {
// DEBUG
if (Debug.EnableError && hasDebug()) Debug.println(ex);
}
// Check if there are any file save requests pending in the queue database
FileRequestQueue saveQueue = new FileRequestQueue();
try {
dbQueue.loadFileRequests(1, FileRequest.SAVE, saveQueue, 1);
} catch (DBException ex) {
}
// Create the background load/save thread pool
m_backgroundLoader = new BackgroundLoadSave("DBLdr", dbQueue, m_stateCache, this);
m_backgroundLoader.setReadWorkers(m_readWorkers);
m_backgroundLoader.setWriteWorkers(m_writeWorkers);
m_backgroundLoader.setDebug(m_threadDebug);
// Start the file loader threads, start the request loading if there are pending file save
// requests
m_backgroundLoader.startThreads(saveQueue.numberOfRequests());
// Queue the recovered file save requests
if (recoveredQueue != null) {
// Queue the file save requests
while (recoveredQueue.numberOfRequests() > 0)
queueFileRequest(recoveredQueue.removeRequestNoWait());
}
}
