ProcessFileLock (Apache Jena - DBOE Base 4.2.0)

java.lang.Object
- org.apache.jena.dboe.base.file.ProcessFileLock

```
public class ProcessFileLock
extends java.lang.Object
```
A simple packaging around a FileLock.
ProcessFileLocks are not reentrant locks.
See create(java.lang.String) and release(org.apache.jena.dboe.base.file.ProcessFileLock) to obtain and stop using a ProcessFileLock.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static ProcessFileLock`	`create(java.lang.String filename)`	Create a `ProcessFileLock` using the named file.
`java.nio.file.Path`	`getPath()`
`boolean`	`isLockedHere()`	Return true if this process holds the lock.
`void`	`lockEx()`	Lock the file or throw `DBOpEnvException`.
`void`	`lockWait()`	Lock the file or wait.
`static void`	`release(ProcessFileLock lockFile)`	Return the lock, unlocking the file if this process has it locked.
`boolean`	`tryLock()`	Lock a file, return true on success else false.
`void`	`unlock()`	Release the lock - this must be paired with a "lock" operation.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - create
```
public static ProcessFileLock create(java.lang.String filename)
```
    Create a ProcessFileLock using the named file. Locks are JVM-wide; each filename is associated with one lock object.
  - release
```
public static void release(ProcessFileLock lockFile)
```
    Return the lock, unlocking the file if this process has it locked.
  - lockEx
```
public void lockEx()
```
    Lock the file or throw DBOpEnvException.
    
    Throws:
    
    AlreadyLocked - if the lock is already held by this process.
  - lockWait
```
public void lockWait()
```
    Lock the file or wait.
    
    Throws:
    
    AlreadyLocked - if the lock is already held by this process.
  - tryLock
```
public boolean tryLock()
```
    Lock a file, return true on success else false.
    
    Throws:
    
    AlreadyLocked - if the lock is already held by this process.
  - unlock
```
public void unlock()
```
    Release the lock - this must be paired with a "lock" operation.
    
    Throws:
    
    java.lang.IllegalStateException - if the lock is not held by this process.
  - isLockedHere
```
public boolean isLockedHere()
```
    Return true if this process holds the lock.
  - getPath
```
public java.nio.file.Path getPath()
```