Package de.dlr.proseo.storagemgr.utils

Klasse StorageFileLocker

java.lang.Object

de.dlr.proseo.storagemgr.utils.StorageFileLocker

public class StorageFileLocker
extends Object

A mechanism to lock and unlock files during the download process. It helps manage concurrent access to files by ensuring that only one process or thread can access a file at a time.

Autor:

Denys Chaykovskiy

Konstruktorübersicht

Konstruktoren

Konstruktor	Beschreibung
StorageFileLocker(String path, long waitTime, long fileCheckMaxCycles)	Constructor

Methodenübersicht

Modifizierer und Typ	Methode	Beschreibung
void	lockOrWaitUntilUnlockedAndLock()	Acquires a lock on the file.
void	unlock()	Releases the lock on the file by removing the file path from the productLockSet.

Von Klasse geerbte Methoden java.lang.Object

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

Konstruktordetails

StorageFileLocker

public StorageFileLocker(String path,
 long waitTime,
 long fileCheckMaxCycles)

Constructor

Parameter:

path - path of the file

waitTime - the wait time between each cycle of checking the file lock status

fileCheckMaxCycles - file check max cycles

Methodendetails

lockOrWaitUntilUnlockedAndLock

public void lockOrWaitUntilUnlockedAndLock()
                                    throws FileLockedAfterMaxCyclesException,
InterruptedException

Acquires a lock on the file. The method checks if the file is already locked by checking if it exists in the productLockSet. If it's not locked, it adds the file path to the set and breaks out of the loop. Otherwise, it waits for the specified waitTime and checks again. This process continues for a maximum of fileCheckMaxCycles cycles.

Löst aus:

FileLockedAfterMaxCyclesException - if the file is still locked after a maximum number of checks

InterruptedException - if the thread is interrupted while waiting for the concurrent access to terminate

unlock

public void unlock()

Releases the lock on the file by removing the file path from the productLockSet.