Java Doc for RAIDb1_RR.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » loadbalancer » raidb1 » 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.raidb1   Source Cross Reference   Class Diagram   Java Document (Java Doc)   org.continuent.sequoia.controller.loadbalancer.raidb1.RAIDb1    org.continuent.sequoia.controller.loadbalancer.raidb1.RAIDb1_RR RAIDb1_RR public class RAIDb1_RR extends RAIDb1 (Code) RAIDb-1 Round Robin load balancer The read requests coming from the Request Manager are sent in a round robin to the backend nodes. Write requests are broadcasted to all backends. author:    Emmanuel Cecchet author:    Julie Marguerite version:    1.0 Constructor Summary public   RAIDb1_RR(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 simple round-robin algorithm and executes the read request. 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 simple round-robin algorithm. public  ControllerResultSet readOnlyCallableStatementExecuteQuery(StoredProcedure proc, MetadataCache metadataCache)      Selects the backend using a simple round-robin algorithm and executes the read request. Constructor Detail RAIDb1_RR public RAIDb1_RR(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 simple round-robin algorithm and executes the read request. 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 simple round-robin algorithm. 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 simple round-robin algorithm and executes the read request. 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)