org.rrd4j.core
Class RrdSafeFileBackendFactory

java.lang.Object
  org.rrd4j.core.RrdBackendFactory
      org.rrd4j.core.RrdFileBackendFactory
          org.rrd4j.core.RrdRandomAccessFileBackendFactory
              org.rrd4j.core.RrdSafeFileBackendFactory

public class RrdSafeFileBackendFactory
extends RrdRandomAccessFileBackendFactory

Factory class which creates actual RrdSafeFileBackend objects.

Field Summary

static long	LOCK_RETRY_PERIOD Default time between two consecutive file locking attempts.
static long	LOCK_WAIT_TIME Default time (in milliseconds) this backend will wait for a file lock.

Constructor Summary

RrdSafeFileBackendFactory()

Method Summary

static long	getLockRetryPeriod() Returns time between two consecutive file locking attempts.
static long	getLockWaitTime() Returns time this backend will wait for a file lock.
String	getName() Returns the name (primary ID) for the factory.
protected RrdBackend	open(String path, boolean readOnly) Creates RrdSafeFileBackend object for the given file path.
static void	setLockRetryPeriod(long lockRetryPeriod) Sets time between two consecutive file locking attempts.
static void	setLockWaitTime(long lockWaitTime) Sets time this backend will wait for a file lock.

Methods inherited from class org.rrd4j.core.RrdRandomAccessFileBackendFactory

exists, shouldValidateHeader

Methods inherited from class org.rrd4j.core.RrdBackendFactory

getDefaultFactory, getFactory, registerAndSetAsDefaultFactory, registerFactory, setDefaultFactory

Methods inherited from class java.lang.Object

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

Field Detail

LOCK_WAIT_TIME

public static final long LOCK_WAIT_TIME

Default time (in milliseconds) this backend will wait for a file lock.

See Also:

Constant Field Values

LOCK_RETRY_PERIOD

public static final long LOCK_RETRY_PERIOD

Default time between two consecutive file locking attempts.

See Also:

Constant Field Values

Constructor Detail

RrdSafeFileBackendFactory

public RrdSafeFileBackendFactory()

Method Detail

open

protected RrdBackend open(String path,
                          boolean readOnly)
                   throws IOException

Creates RrdSafeFileBackend object for the given file path.

Overrides:

open in class RrdRandomAccessFileBackendFactory

Parameters:

path - File path

readOnly - This parameter is ignored

Returns:

RrdSafeFileBackend object which handles all I/O operations for the given file path

Throws:

IOException - Thrown in case of I/O error.

getName

public String getName()

Description copied from class: RrdBackendFactory

Returns the name (primary ID) for the factory.

Overrides:

getName in class RrdRandomAccessFileBackendFactory

Returns:

Name of the factory.

getLockWaitTime

public static long getLockWaitTime()

Returns time this backend will wait for a file lock.

Returns:

Time (in milliseconds) this backend will wait for a file lock.

setLockWaitTime

public static void setLockWaitTime(long lockWaitTime)

Sets time this backend will wait for a file lock.

Parameters:

lockWaitTime - Maximum lock wait time (in milliseconds)

getLockRetryPeriod

public static long getLockRetryPeriod()

Returns time between two consecutive file locking attempts.

Returns:

Time (im milliseconds) between two consecutive file locking attempts.

setLockRetryPeriod

public static void setLockRetryPeriod(long lockRetryPeriod)

Sets time between two consecutive file locking attempts.

Parameters:

lockRetryPeriod - time (in milliseconds) between two consecutive file locking attempts.