stella.util

Class TransferListener.TransferThread

java.lang.Object

java.lang.Thread

stella.util.TransferListener.TransferThread

All Implemented Interfaces:

Runnable

Enclosing class:

TransferListener

private final class TransferListener.TransferThread
extends Thread

This is the main transfer thread. It has two (blocking) queues, the high-priority fits queue and the lower priority copy queue. Copy-queue files are simply copied, while fits file are first compressed before they are copied using the imcopy program. The destination directory is determined by scanning for the dateobs key in fits files or (for copy files or if the dateobs is not successful) using the file creation time. This time is used to calculate a jd, round that and calculating a date from that rounded jd, formatting with yyyyMMdd. If the file header is compatible to one of the TransferListener.KEY_FITSDB entries, also the obs db is updated. If the file has been successfully transferred, it is moved into the transfer directory and (if a db-relavant file), the db is updated again.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	cancel If true, we cancel.
private BlockingDeque<File>	copyqueue The que of the low-priority copy files.
private BlockingDeque<File>	fitsqueue The queue of the fits files.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Modifier	Constructor and Description
private	TransferThread() Constructs a new transfer thread and starts it.

Method Summary

Modifier and Type	Method and Description
private BlockingDeque<File>	getCopyQueue() Retunrs the blocking queue used for a simple copy of files.
private BlockingDeque<File>	getFitsQueue() Return the blocking queue used for the fits files.
void	run() We run forever until canceled.
private void	transferCopy() Transfer the first file in the copy queue to the target host.
private void	transferFits() Transfers the first file in the fitsqueue or waits at most TransferListener.KEY_POLLTIME for a file to get available.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

fitsqueue

private BlockingDeque<File> fitsqueue

The queue of the fits files.

copyqueue

private BlockingDeque<File> copyqueue

The que of the low-priority copy files.

cancel

private boolean cancel

If true, we cancel.

Constructor Detail

TransferThread

private TransferThread()

Constructs a new transfer thread and starts it. The queues are initialized in the stnchronized run method.

Method Detail

getFitsQueue

private BlockingDeque<File> getFitsQueue()

Return the blocking queue used for the fits files. Fits files are always imcompressed before transferring and transferred with higher priority than to-copy files.

getCopyQueue

private BlockingDeque<File> getCopyQueue()

Retunrs the blocking queue used for a simple copy of files.

run

public void run()

We run forever until canceled. Whenever there are file in the fits queue, they are compressed and transferred to the target host. In the remainder time (i.e. fits queue is empty), the copy files are transferred.

Specified by:

run in interface Runnable

Overrides:

run in class Thread

transferFits

private void transferFits()

Transfers the first file in the fitsqueue or waits at most TransferListener.KEY_POLLTIME for a file to get available. Once a file has been found, the first action is to enter it into the obs database, marking it as not-transferred, if the fits name is compliant with the db-requesting #KEY_DBFITS. It is than compressed using the rice loss-less image compression algorithm and transferred to the home host. If all that was successful, it is marked in the db as transferred and moved to the transfer dir.

transferCopy

private void transferCopy()

Transfer the first file in the copy queue to the target host. On success, it is moved to the transferred subdir.