org.objectweb.cjdbc.controller.scheduler.raidb0
Class RAIDb0PessimisticTransactionLevelScheduler

java.lang.Object
  org.objectweb.cjdbc.controller.scheduler.AbstractScheduler
      org.objectweb.cjdbc.controller.scheduler.raidb0.RAIDb0PessimisticTransactionLevelScheduler

public class RAIDb0PessimisticTransactionLevelScheduler

extends AbstractScheduler

This scheduler provides transaction level scheduling for RAIDb-0 controllers. Each write takes a lock on the whole database. All following writes are blocked until the transaction of the first write completes.

Version:

1.0

Author:

Emmanuel Cecchet

Field Summary

private TransactionExclusiveLock	lock
private int	requestId

Fields inherited from class org.objectweb.cjdbc.controller.scheduler.AbstractScheduler

logger, needSQLMacroHandling, parsingGranularity, raidbLevel

Constructor Summary

RAIDb0PessimisticTransactionLevelScheduler()
Creates a new Pessimistic Transaction Level Scheduler

Method Summary

protected void	commitTransaction(int transactionId) Commit a transaction given its id.
java.lang.String	getInformation() Get information about the Request Scheduler
java.lang.String	getXmlInformation() Get information about the Request Scheduler in xml format
void	notifyWriteCompleted(AbstractWriteRequest request) Notify the completion of a write statement.
void	readCompleted(SelectRequest request) Notify the completion of a read statement.
private void	releaseLock(int transactionId) Release the locks we may own on the schema.
protected void	rollbackTransaction(int transactionId) Rollback a transaction given its id.
void	scheduleNonSuspendedWriteRequest(AbstractWriteRequest request) Additionally to scheduling the request, this method replaces the SQL Date macros such as now() with the current date.
void	scheduleReadRequest(SelectRequest request) Additionally to scheduling the request, this method replaces the SQL Date macros such as now() with the current date.

Methods inherited from class org.objectweb.cjdbc.controller.scheduler.AbstractScheduler

begin, beginCompleted, commit, commitCompleted, getParsingGranularity, getPendingWrites, getRAIDbLevel, handleSQLMacros, hasSQLMacros, mergeDatabaseSchema, resumeNewTransactions, resumeWrites, rollback, rollbackCompleted, scheduleReadRequest, scheduleWriteRequest, setDatabaseSchema, setParsingGranularity, setRAIDbLevel, suspendNewTransactionsForCheckpoint, suspendWrites, writeCompleted

Methods inherited from class java.lang.Object

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

Field Detail

requestId

private int requestId

lock

private TransactionExclusiveLock lock

Constructor Detail

RAIDb0PessimisticTransactionLevelScheduler

public RAIDb0PessimisticTransactionLevelScheduler()

Creates a new Pessimistic Transaction Level Scheduler

Method Detail

scheduleReadRequest

public final void scheduleReadRequest(SelectRequest request)
                               throws java.sql.SQLException

Additionally to scheduling the request, this method replaces the SQL Date macros such as now() with the current date.

Specified by:

scheduleReadRequest in class AbstractScheduler

Parameters:

request - Select request to schedule (SQL macros are already handled if needed)

Throws:

java.sql.SQLException - if a timeout occurs

See Also:

AbstractScheduler.scheduleReadRequest(SelectRequest)

readCompleted

public final void readCompleted(SelectRequest request)

Description copied from class: AbstractScheduler

Notify the completion of a read statement.

Specified by:

readCompleted in class AbstractScheduler

Parameters:

request - the completed request

See Also:

AbstractScheduler.readCompleted(SelectRequest)

scheduleNonSuspendedWriteRequest

public void scheduleNonSuspendedWriteRequest(AbstractWriteRequest request)
                                      throws java.sql.SQLException

Additionally to scheduling the request, this method replaces the SQL Date macros such as now() with the current date. Note that CREATE statements are not synchronized.

Specified by:

scheduleNonSuspendedWriteRequest in class AbstractScheduler

Parameters:

request - Write request to schedule (SQL macros are already handled if needed)

Throws:

java.sql.SQLException - if a timeout occurs

See Also:

AbstractScheduler.scheduleWriteRequest(AbstractWriteRequest)

notifyWriteCompleted

public final void notifyWriteCompleted(AbstractWriteRequest request)

Description copied from class: AbstractScheduler

Notify the completion of a write statement. This method does not need to be synchronized, it is enforced by the caller.

Specified by:

notifyWriteCompleted in class AbstractScheduler

Parameters:

request - the completed request

See Also:

AbstractScheduler.notifyWriteCompleted(AbstractWriteRequest)

commitTransaction

protected final void commitTransaction(int transactionId)

Description copied from class: AbstractScheduler

Commit a transaction given its id.

Specified by:

commitTransaction in class AbstractScheduler

Parameters:

transactionId - the transaction id

See Also:

AbstractScheduler.commitTransaction(int)

rollbackTransaction

protected final void rollbackTransaction(int transactionId)

Description copied from class: AbstractScheduler

Rollback a transaction given its id.

Specified by:

rollbackTransaction in class AbstractScheduler

Parameters:

transactionId - the transaction id

See Also:

AbstractScheduler.rollbackTransaction(int)

releaseLock

private final void releaseLock(int transactionId)

Release the locks we may own on the schema.

Parameters:

transactionId - id of the transaction that releases the lock

getInformation

public java.lang.String getInformation()

Description copied from class: AbstractScheduler

Get information about the Request Scheduler

Specified by:

getInformation in class AbstractScheduler

Returns:

String containing information

See Also:

AbstractScheduler.getInformation()

getXmlInformation

public java.lang.String getXmlInformation()

Description copied from class: AbstractScheduler

Get information about the Request Scheduler in xml format

Specified by:

getXmlInformation in class AbstractScheduler

Returns:

String containing information in xml

See Also:

AbstractScheduler.getXmlInformation()