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

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

All Implemented Interfaces:

GenericFileExclusiveReadLockStrategy<File>

Direct Known Subclasses:

FileChangedExclusiveReadLockStrategy, FileLockExclusiveReadLockStrategy

public class MarkerFileExclusiveReadLockStrategy
extends Object
implements GenericFileExclusiveReadLockStrategy<File>

Acquires read lock to the given file using a marker file so other Camel consumers wont acquire the same file. This is the default behavior in Camel 1.x.

Constructor Summary

MarkerFileExclusiveReadLockStrategy()

Method Summary

boolean	acquireExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Acquires exclusive read lock to the file.
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	releaseExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Releases the exclusive read lock granted by the acquireExclusiveReadLock method.
void	setCheckInterval(long checkInterval) Sets the check interval period.
void	setTimeout(long timeout) Sets an optional timeout period.

Methods inherited from class java.lang.Object

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

Constructor Detail

MarkerFileExclusiveReadLockStrategy

public MarkerFileExclusiveReadLockStrategy()

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>

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>

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

releaseExclusiveReadLock

public void releaseExclusiveReadLock(GenericFileOperations<File> operations,
                                     GenericFile<File> file,
                                     Exchange exchange)
                              throws Exception

Description copied from interface: GenericFileExclusiveReadLockStrategy

Releases the exclusive read lock granted by the acquireExclusiveReadLock method.

Specified by:

releaseExclusiveReadLock in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

operations - generic file operations

file - the file

exchange - the exchange

Throws:

Exception - can be thrown in case of errors

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>

Parameters:

timeout - period in millis

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>

Parameters:

checkInterval - interval in millis