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

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

All Implemented Interfaces:

XmlComponent

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 long	requestId

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

logger, parsingGranularity, raidbLevel

Fields inherited from interface org.objectweb.cjdbc.common.xml.XmlComponent

DOCTYPE_DB, XML_VERSION

Constructor Summary

RAIDb0PessimisticTransactionLevelScheduler()
Creates a new Pessimistic Transaction Level Scheduler

Method Summary

protected void	commitTransaction(long transactionId) Commit a transaction given its id.
java.lang.String	getXmlImpl()
void	notifyWriteCompleted(AbstractWriteRequest request) Notify the completion of a write statement.
void	readCompletedNotify(SelectRequest request) Notify the completion of a read statement.
private void	releaseLock(long transactionId) Release the locks we may own on the schema.
protected void	rollbackTransaction(long 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, getNumberRead, getNumberWrite, getParsingGranularity, getPendingTransactions, getPendingWrites, getRAIDbLevel, getSchedulerData, getXml, hasSQLMacros, initializeTransactionId, isSuspendedTransactions, isSuspendedWrites, mergeDatabaseSchema, readCompleted, resumeNewTransactions, resumeWrites, rollback, rollbackCompleted, 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 long 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)

readCompletedNotify

public final void readCompletedNotify(SelectRequest request)

Description copied from class: AbstractScheduler

Notify the completion of a read statement.

Specified by:

readCompletedNotify in class AbstractScheduler

Parameters:

request - the completed request

See Also:

AbstractScheduler.readCompletedNotify(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(long 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(long)

rollbackTransaction

protected final void rollbackTransaction(long 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(long)

releaseLock

private void releaseLock(long transactionId)

Release the locks we may own on the schema.

Parameters:

transactionId - id of the transaction that releases the lock

getXmlImpl

public java.lang.String getXmlImpl()

Specified by:

getXmlImpl in class AbstractScheduler

See Also:

AbstractScheduler.getXmlImpl()