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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.controller.loadbalancer.raidb1

Source Cross Reference Class Diagram Java Document (Java Doc)

org.continuent.sequoia.controller.loadbalancer.raidb1 .RAIDb1

org.continuent.sequoia.controller.loadbalancer.raidb1 .RAIDb1_LPRF

RAIDb1_LPRF
public class RAIDb1_LPRF extends RAIDb1 (Code)
	RAIDb-1 Round Robin load balancer featuring (Least Pending Requests First load balancing algorithm). The read requests coming from the Request Manager are sent to the node that has the least pending read requests among the nodes that can execute the request. Write requests are broadcasted to all backends. author: Emmanuel Cecchet version: 1.0

Constructor Summary
public	RAIDb1_LPRF(VirtualDatabase vdb, WaitForCompletionPolicy waitForCompletionPolicy) Creates a new RAIDb-1 Round Robin request load balancer.

Method Summary
public ControllerResultSet	execSingleBackendReadRequest(SelectRequest request, MetadataCache metadataCache) Selects the backend using a least pending request first policy.
public String	getInformation() Gets information about the request load balancer.
public String	getRaidb1Xml()
public ExecuteResult	readOnlyCallableStatementExecute(StoredProcedure proc, MetadataCache metadataCache) Selects the backend using a least pending request first policy.
public ControllerResultSet	readOnlyCallableStatementExecuteQuery(StoredProcedure proc, MetadataCache metadataCache) Selects the backend using a least pending request first policy.

Constructor Detail

RAIDb1_LPRF
public RAIDb1_LPRF(VirtualDatabase vdb, WaitForCompletionPolicy waitForCompletionPolicy) throws Exception(Code)
	Creates a new RAIDb-1 Round Robin request load balancer. Parameters: vdb - the virtual database this load balancer belongs to. Parameters: waitForCompletionPolicy - how many backends must complete beforereturning the result? throws: Exception - if an error occurs

Method Detail

execSingleBackendReadRequest
public ControllerResultSet execSingleBackendReadRequest(SelectRequest request, MetadataCache metadataCache) throws SQLException(Code)
	Selects the backend using a least pending request first policy. The backend that has the shortest queue of currently executing queries is chosen to execute this query. See Also: org.continuent.sequoia.controller.loadbalancer.raidb1.RAIDb1.statementExecuteQuery(SelectRequestMetadataCache)

getInformation
public String getInformation()(Code)
	Gets information about the request load balancer. `String` containing information

getRaidb1Xml
public String getRaidb1Xml()(Code)
	See Also: org.continuent.sequoia.controller.loadbalancer.raidb1.RAIDb1.getRaidb1Xml

readOnlyCallableStatementExecute
public ExecuteResult readOnlyCallableStatementExecute(StoredProcedure proc, MetadataCache metadataCache) throws SQLException(Code)
	Selects the backend using a least pending request first policy. The backend that has the shortest queue of currently executing queries is chosen to execute this stored procedure. See Also: org.continuent.sequoia.controller.loadbalancer.AbstractLoadBalancer.readOnlyCallableStatementExecute(StoredProcedureMetadataCache)

readOnlyCallableStatementExecuteQuery
public ControllerResultSet readOnlyCallableStatementExecuteQuery(StoredProcedure proc, MetadataCache metadataCache) throws SQLException(Code)
	Selects the backend using a least pending request first policy. The backend that has the shortest queue of currently executing queries is chosen to execute this stored procedure. See Also: org.continuent.sequoia.controller.loadbalancer.AbstractLoadBalancer.readOnlyCallableStatementExecuteQuery(StoredProcedureMetadataCache)

Fields inherited from org.continuent.sequoia.controller.loadbalancer.raidb1.RAIDb1

final protected static int CALLABLE_STATEMENT_EXECUTE(Code)(Java Doc)
final protected static int CALLABLE_STATEMENT_EXECUTE_QUERY(Code)(Java Doc)
final protected static int STATEMENT_EXECUTE_QUERY(Code)(Java Doc)
protected static Trace endUserLogger(Code)(Java Doc)
protected static Trace logger(Code)(Java Doc)

Methods inherited from org.continuent.sequoia.controller.loadbalancer.raidb1.RAIDb1

public void abort(TransactionMetaData tm) throws SQLException(Code)(Java Doc)
final public void begin(TransactionMetaData tm) throws SQLException(Code)(Java Doc)
public ExecuteResult callableStatementExecute(StoredProcedure proc, MetadataCache metadataCache) throws SQLException, AllBackendsFailedException(Code)(Java Doc)
public ControllerResultSet callableStatementExecuteQuery(StoredProcedure proc, MetadataCache metadataCache) throws SQLException, AllBackendsFailedException(Code)(Java Doc)
public ExecuteUpdateResult callableStatementExecuteUpdate(StoredProcedure proc) throws SQLException, AllBackendsFailedException(Code)(Java Doc)
public void closePersistentConnection(String login, long persistentConnectionId) throws SQLException(Code)(Java Doc)
public void commit(TransactionMetaData tm) throws SQLException(Code)(Java Doc)
public void disableBackend(DatabaseBackend db, boolean forceDisable) throws SQLException(Code)(Java Doc)
public synchronized void enableBackend(DatabaseBackend db, boolean writeEnabled) throws SQLException(Code)(Java Doc)
abstract public ControllerResultSet execSingleBackendReadRequest(SelectRequest request, MetadataCache metadataCache) throws SQLException(Code)(Java Doc)
protected ControllerResultSet executeRequestOnBackend(SelectRequest request, DatabaseBackend backend, MetadataCache metadataCache) throws SQLException, UnreachableBackendException(Code)(Java Doc)
protected Object executeStoredProcedureOnBackend(StoredProcedure proc, boolean isExecuteQuery, DatabaseBackend backend, MetadataCache metadataCache) throws SQLException, UnreachableBackendException(Code)(Java Doc)
public ControllerResultSet getPreparedStatementGetMetaData(AbstractRequest request) throws SQLException(Code)(Java Doc)
abstract public String getRaidb1Xml()(Code)(Java Doc)
public String getXmlImpl()(Code)(Java Doc)
public void openPersistentConnection(String login, long persistentConnectionId) throws SQLException(Code)(Java Doc)
public void releaseSavepoint(TransactionMetaData tm, String savepointName) throws SQLException(Code)(Java Doc)
public void rollback(TransactionMetaData tm) throws SQLException(Code)(Java Doc)
public void rollbackToSavepoint(TransactionMetaData tm, String savepointName) throws SQLException(Code)(Java Doc)
public void setSavepoint(TransactionMetaData tm, String savepointName) throws SQLException(Code)(Java Doc)
public ExecuteResult statementExecute(AbstractRequest request, MetadataCache metadataCache) throws SQLException, AllBackendsFailedException(Code)(Java Doc)
public ControllerResultSet statementExecuteQuery(SelectRequest request, MetadataCache metadataCache) throws SQLException, AllBackendsFailedException(Code)(Java Doc)
public ExecuteUpdateResult statementExecuteUpdate(AbstractWriteRequest request) throws AllBackendsFailedException, NoMoreBackendException, SQLException(Code)(Java Doc)
public GeneratedKeysResult statementExecuteUpdateWithKeys(AbstractWriteRequest request, MetadataCache metadataCache) throws AllBackendsFailedException, NoMoreBackendException, SQLException(Code)(Java Doc)

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