org.apache.camel.component.file.strategy
Class FileChangedExclusiveReadLockStrategy

java.lang.Object
  org.apache.camel.component.file.strategy.MarkerFileExclusiveReadLockStrategy
      org.apache.camel.component.file.strategy.FileChangedExclusiveReadLockStrategy

All Implemented Interfaces:

GenericFileExclusiveReadLockStrategy<File>

public class FileChangedExclusiveReadLockStrategy
extends MarkerFileExclusiveReadLockStrategy

Acquires exclusive read lock to the given file by checking whether the file is being changed by scanning the file at different intervals (to detect changes).

Constructor Summary

FileChangedExclusiveReadLockStrategy()

Method Summary

boolean	acquireExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Acquires exclusive read lock to the file.
long	getCheckInterval()
long	getTimeout()
void	prepareOnStartup(GenericFileOperations<File> operations, GenericFileEndpoint<File> endpoint) Allows custom logic to be run on startup preparing the strategy, such as removing old lock files etc.
void	setCheckInterval(long checkInterval) Sets the check interval period.
void	setTimeout(long timeout) Sets an optional timeout period.

Methods inherited from class org.apache.camel.component.file.strategy.MarkerFileExclusiveReadLockStrategy

releaseExclusiveReadLock

Methods inherited from class java.lang.Object

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

Constructor Detail

FileChangedExclusiveReadLockStrategy

public FileChangedExclusiveReadLockStrategy()

Method Detail

prepareOnStartup

public void prepareOnStartup(GenericFileOperations<File> operations,
                             GenericFileEndpoint<File> endpoint)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Allows custom logic to be run on startup preparing the strategy, such as removing old lock files etc.

Specified by:

prepareOnStartup in interface GenericFileExclusiveReadLockStrategy<File>

Overrides:

prepareOnStartup in class MarkerFileExclusiveReadLockStrategy

Parameters:

operations - generic file operations

endpoint - the endpoint

acquireExclusiveReadLock

public boolean acquireExclusiveReadLock(GenericFileOperations<File> operations,
                                        GenericFile<File> file,
                                        Exchange exchange)
                                 throws Exception

Description copied from interface: GenericFileExclusiveReadLockStrategy

Acquires exclusive read lock to the file.

Specified by:

acquireExclusiveReadLock in interface GenericFileExclusiveReadLockStrategy<File>

Overrides:

acquireExclusiveReadLock in class MarkerFileExclusiveReadLockStrategy

Parameters:

operations - generic file operations

file - the file

exchange - the exchange

Returns:

true if read lock was acquired. If false Camel will skip the file and try it on the next poll

Throws:

Exception - can be thrown in case of errors

getTimeout

public long getTimeout()

setTimeout

public void setTimeout(long timeout)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets an optional timeout period.

If the readlock could not be granted within the time period then the wait is stopped and the acquireExclusiveReadLock method returns false.

Specified by:

setTimeout in interface GenericFileExclusiveReadLockStrategy<File>

Overrides:

setTimeout in class MarkerFileExclusiveReadLockStrategy

Parameters:

timeout - period in millis

getCheckInterval

public long getCheckInterval()

setCheckInterval

public void setCheckInterval(long checkInterval)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets the check interval period.

The check interval is used for sleeping between attempts to acquire read lock. Setting a high value allows to cater for slow writes in case the producer of the file is slow.

The default period is 1000 millis.

Specified by:

setCheckInterval in interface GenericFileExclusiveReadLockStrategy<File>

Overrides:

setCheckInterval in class MarkerFileExclusiveReadLockStrategy

Parameters:

checkInterval - interval in millis