Java Doc for RAIDb2_LPRF.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » loadbalancer » raidb2 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.controller.loadbalancer.raidb2   Source Cross Reference   Class Diagram   Java Document (Java Doc)   org.continuent.sequoia.controller.loadbalancer.raidb2.RAIDb2    org.continuent.sequoia.controller.loadbalancer.raidb2.RAIDb2_LPRF RAIDb2_LPRF public class RAIDb2_LPRF extends RAIDb2 (Code) RAIDb-2 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. author:    Emmanuel Cecchet version:    1.0 Constructor Summary public   RAIDb2_LPRF(VirtualDatabase vdb, WaitForCompletionPolicy waitForCompletionPolicy, CreateTablePolicy createTablePolicy)      Creates a new RAIDb-2 Round Robin request load balancer. Method Summary public  String getInformation()      Gets information about the request load balancer. public  String getRaidb2Xml()      public  ExecuteResult readOnlyCallableStatementExecute(StoredProcedure proc, MetadataCache metadataCache)      Chooses the node to execute the stored procedure using a LPRF algorithm. public  ControllerResultSet readOnlyCallableStatementExecuteQuery(StoredProcedure proc, MetadataCache metadataCache)      Chooses the node to execute the stored procedure using a LPRF algorithm. public  ControllerResultSet statementExecuteQuery(SelectRequest request, MetadataCache metadataCache)      Chooses the node to execute the request using a round-robin algorithm. Constructor Detail RAIDb2_LPRF public RAIDb2_LPRF(VirtualDatabase vdb, WaitForCompletionPolicy waitForCompletionPolicy, CreateTablePolicy createTablePolicy) throws Exception(Code) Creates a new RAIDb-2 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? Parameters:   createTablePolicy - the policy defining how 'create table' statementsshould be handled exception:   Exception - if an error occurs Method Detail getInformation public String getInformation()(Code) Gets information about the request load balancer. String containing information getRaidb2Xml public String getRaidb2Xml()(Code) See Also:   org.continuent.sequoia.controller.loadbalancer.raidb2.RAIDb2.getRaidb2Xml readOnlyCallableStatementExecute public ExecuteResult readOnlyCallableStatementExecute(StoredProcedure proc, MetadataCache metadataCache) throws SQLException(Code) Chooses the node to execute the stored procedure using a LPRF algorithm. If the next node has not the needed stored procedure, we try the next one and so on until a suitable backend is found. See Also:   org.continuent.sequoia.controller.loadbalancer.AbstractLoadBalancer.readOnlyCallableStatementExecute(org.continuent.sequoia.controller.requests.StoredProcedureorg.continuent.sequoia.controller.cache.metadata.MetadataCache) readOnlyCallableStatementExecuteQuery public ControllerResultSet readOnlyCallableStatementExecuteQuery(StoredProcedure proc, MetadataCache metadataCache) throws SQLException(Code) Chooses the node to execute the stored procedure using a LPRF algorithm. If the next node has not the needed stored procedure, we try the next one and so on until a suitable backend is found. See Also:   org.continuent.sequoia.controller.loadbalancer.AbstractLoadBalancer.readOnlyCallableStatementExecuteQuery(StoredProcedureMetadataCache) statementExecuteQuery public ControllerResultSet statementExecuteQuery(SelectRequest request, MetadataCache metadataCache) throws SQLException(Code) Chooses the node to execute the request using a round-robin algorithm. If the next node has not the tables needed to execute the requests, we try the next one and so on until a suitable backend is found. Parameters:   request - an SelectRequest Parameters:   metadataCache - cached metadata to use to construct the result set the corresponding java.sql.ResultSet exception:   SQLException - if an error occurs See Also:   org.continuent.sequoia.controller.loadbalancer.raidb2.RAIDb2.statementExecuteQuery(SelectRequestMetadataCache) Fields inherited from org.continuent.sequoia.controller.loadbalancer.raidb2.RAIDb2 final protected static int CALLABLE_STATEMENT_EXECUTE(Code)(Java Doc) final protected static int CALLABLE_STATEMENT_EXECUTE_QUERY(Code)(Java Doc) protected CreateTablePolicy createTablePolicy(Code)(Java Doc) protected static Trace logger(Code)(Java Doc) Methods inherited from org.continuent.sequoia.controller.loadbalancer.raidb2.RAIDb2 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) protected ControllerResultSet executeReadRequestOnBackend(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 getRaidb2Xml()(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) abstract public ControllerResultSet statementExecuteQuery(SelectRequest request, MetadataCache metadataCache) throws SQLException(Code)(Java Doc) public ExecuteUpdateResult statementExecuteUpdate(AbstractWriteRequest request) throws AllBackendsFailedException, SQLException(Code)(Java Doc) public GeneratedKeysResult statementExecuteUpdateWithKeys(AbstractWriteRequest request, MetadataCache metadataCache) throws AllBackendsFailedException, SQLException(Code)(Java Doc)