org.apache.river.phoenix

Class Activation.ActLogHandler

java.lang.Object

org.apache.river.reliableLog.LogHandler

org.apache.river.phoenix.Activation.ActLogHandler

Enclosing class:

Activation

private static class Activation.ActLogHandler
extends LogHandler

Handler for the log that knows how to take the initial snapshot and apply an update (a LogRecord) to the current state.

Field Summary

Fields

Modifier and Type	Field and Description
private Activation	state

Constructor Summary

Constructors

Constructor and Description
ActLogHandler()

Method Summary

Modifier and Type	Method and Description
void	applyUpdate(Object update) Reads a stably logged update (a serializable object) from a stream.
Activation	getState()
void	readUpdate(InputStream in) Reads a stably logged update (a serializable object) from a stream.
void	recover(InputStream in) Read the snapshot from a stream.
void	snapshot(OutputStream out) Writes the snapshot to a stream.
void	writeUpdate(OutputStream out, Object value) Writes the representation (a serializable object) of an update to a stream.

Methods inherited from class java.lang.Object

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

Field Detail

state

private Activation state

Constructor Detail

ActLogHandler

ActLogHandler()

Method Detail

getState

public Activation getState()

snapshot

public void snapshot(OutputStream out)
              throws Exception

Description copied from class: LogHandler

Writes the snapshot to a stream. This callback is invoked when the client calls the snaphot method of ReliableLog.

Specified by:

snapshot in class LogHandler

Parameters:

out - the output stream

Throws:

Exception - can raise any exception

recover

public void recover(InputStream in)
             throws Exception

Description copied from class: LogHandler

Read the snapshot from a stream. This callback is invoked when the client calls the recover method of ReliableLog.

Specified by:

recover in class LogHandler

Parameters:

in - the input stream

Throws:

Exception - can raise any exception

writeUpdate

public void writeUpdate(OutputStream out,
                        Object value)
                 throws Exception

Description copied from class: LogHandler

Writes the representation (a serializable object) of an update to a stream. This callback is invoked when the client calls the update method of ReliableLog.

Overrides:

writeUpdate in class LogHandler

Parameters:

out - the output stream

value - the update object

Throws:

Exception - can raise any exception

readUpdate

public void readUpdate(InputStream in)
                throws Exception

Description copied from class: LogHandler

Reads a stably logged update (a serializable object) from a stream. This callback is invoked during recovery, once for every record in the log. After reading the update, this method invokes the applyUpdate (abstract) method in order to execute the update.

Overrides:

readUpdate in class LogHandler

Parameters:

in - the input stream

Throws:

Exception - can raise any exception

applyUpdate

public void applyUpdate(Object update)
                 throws Exception

Description copied from class: LogHandler

Reads a stably logged update (a serializable object) from a stream. This callback is invoked during recovery, once for every record in the log. After reading the update, this method is invoked in order to execute the update.

Specified by:

applyUpdate in class LogHandler

Parameters:

update - the update object

Throws:

Exception - can raise any exception