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org.apache.avalon.excalibur.datasource.cluster
Interface HashedDataSourceCluster

All Superinterfaces:

Component, Configurable, DataSourceComponent, ThreadSafe

All Known Implementing Classes:

DefaultHashedDataSourceCluster

public interface HashedDataSourceCluster

extends DataSourceComponent

Since:

4.1

Version:

CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:20 $

Author:

Avalon Development Team

Field Summary

static java.lang.String

ROLE The name of the role for convenience

Method Summary

int	getClusterSize() Returns the number of DataSources in the cluster.
java.sql.Connection	getConnectionForHashCode(int hashCode) Gets a Connection to a database given a hash code.
java.sql.Connection	getConnectionForHashObject(java.lang.Object hashObject) Gets a Connection to a database given a hash object.
java.sql.Connection	getConnectionForIndex(int index) Gets a Connection to a database given an index.
int	getIndexForHashCode(int hashCode) Gets the index which will be resolved for a given hashCode.
int	getIndexForHashObject(java.lang.Object hashObject) Gets the index which will be resolved for a given hashCode.

Methods inherited from interface org.apache.avalon.excalibur.datasource.DataSourceComponent

getConnection

Methods inherited from interface org.apache.avalon.framework.configuration.Configurable

configure

Field Detail

ROLE

public static final java.lang.String ROLE

The name of the role for convenience

Method Detail

getClusterSize

public int getClusterSize()

Returns the number of DataSources in the cluster.

Returns:

size of the cluster.

getConnectionForHashObject

public java.sql.Connection getConnectionForHashObject(java.lang.Object hashObject)
                                               throws java.sql.SQLException

Gets a Connection to a database given a hash object.

Parameters:

hashObject - Object whose hashCode will be used to select which of the Clusted DataSources will be provide a Connection.

Throws:

NoValidConnectionException - when there is no valid Connection wrapper available in the classloader or when the index is not valid.

NoAvailableConnectionException - when there are no more available Connections in the pool.

java.sql.SQLException

getConnectionForHashCode

public java.sql.Connection getConnectionForHashCode(int hashCode)
                                             throws java.sql.SQLException

Gets a Connection to a database given a hash code.

Parameters:

hashCode - HashCode which will be used to select which of the Clusted DataSources will be provide a Connection.

Throws:

NoValidConnectionException - when there is no valid Connection wrapper available in the classloader or when the index is not valid.

NoAvailableConnectionException - when there are no more available Connections in the pool.

java.sql.SQLException

getConnectionForIndex

public java.sql.Connection getConnectionForIndex(int index)
                                          throws java.sql.SQLException

Gets a Connection to a database given an index.

Parameters:

index - Index of the DataSource for which a connection is to be returned.

Throws:

NoValidConnectionException - when there is no valid Connection wrapper available in the classloader or when the index is not valid.

NoAvailableConnectionException - when there are no more available Connections in the pool.

java.sql.SQLException

getIndexForHashObject

public int getIndexForHashObject(java.lang.Object hashObject)

Gets the index which will be resolved for a given hashCode. This can be used by user code to optimize the use of DataSource Clusters.

Parameters:

hashObject - Object whose hashCode will be used to select which of the Clusted DataSources will be provide a Connection.

getIndexForHashCode

public int getIndexForHashCode(int hashCode)

Gets the index which will be resolved for a given hashCode. This can be used by user code to optimize the use of DataSource Clusters.

Parameters:

hashCode - HashCode which will be used to select which of the Clusted DataSources will be provide a Connection.