Package org.datanucleus.store.rdbms.datasource.dbcp2

Class DelegatingConnection<C extends Connection>

java.lang.Object

org.datanucleus.store.rdbms.datasource.dbcp2.AbandonedTrace

org.datanucleus.store.rdbms.datasource.dbcp2.DelegatingConnection<C>

Type Parameters:

C - the Connection type

All Implemented Interfaces:

AutoCloseable, Connection, Wrapper, TrackedUse

Direct Known Subclasses:

PoolableConnection, PoolingConnection

public class DelegatingConnection<C extends Connection>
extends AbandonedTrace
implements Connection

A base delegating implementation of Connection.

All of the methods from the Connection interface simply check to see that the Connection is active, and call the corresponding method on the "delegate" provided in my constructor.

Extends AbandonedTrace to implement Connection tracking and logging of code which created the Connection. Tracking the Connection ensures that the AbandonedObjectPool can close this connection and recycle it if its pool of connections is nearing exhaustion and this connection's last usage is older than the removeAbandonedTimeout.

Since:

2.0

Field Summary

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Constructor Summary

Constructors

Constructor	Description
DelegatingConnection(C c)	Creates a wrapper for the Connection which traces this Connection in the AbandonedObjectPool.

Method Summary

Modifier and Type	Method	Description
void	abort(Executor executor)
protected void	activate()
protected void	checkOpen()
void	clearCachedState()	Can be used to clear cached state when it is known that the underlying connection may have been accessed directly.
void	clearWarnings()
void	close()	Closes the underlying connection, and close any Statements that were not explicitly closed.
protected void	closeInternal()
void	commit()
Array	createArrayOf(String typeName, Object[] elements)
Blob	createBlob()
Clob	createClob()
NClob	createNClob()
SQLXML	createSQLXML()
Statement	createStatement()
Statement	createStatement(int resultSetType, int resultSetConcurrency)
Statement	createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
Struct	createStruct(String typeName, Object[] attributes)
boolean	getAutoCommit()
boolean	getCacheState()	Returns the state caching flag.
String	getCatalog()
Properties	getClientInfo()
String	getClientInfo(String name)
Integer	getDefaultQueryTimeout()	Gets the default query timeout that will be used for Statements created from this connection.
C	getDelegate()	Returns my underlying Connection.
protected C	getDelegateInternal()
int	getHoldability()
Connection	getInnermostDelegate()	If my underlying Connection is not a DelegatingConnection, returns it, otherwise recursively invokes this method on my delegate.
Connection	getInnermostDelegateInternal()	Although this method is public, it is part of the internal API and should not be used by clients.
DatabaseMetaData	getMetaData()
int	getNetworkTimeout()
String	getSchema()
int	getTransactionIsolation()
Map<String,Class<?>>	getTypeMap()
SQLWarning	getWarnings()
protected void	handleException(SQLException e)
protected <T extends Throwable> T	handleExceptionNoThrow(T e)	Handles the given SQLException.
boolean	innermostDelegateEquals(Connection c)	Compares innermost delegate to the given connection.
boolean	isClosed()
protected boolean	isClosedInternal()
boolean	isReadOnly()
boolean	isValid(int timeoutSeconds)
boolean	isWrapperFor(Class<?> iface)
String	nativeSQL(String sql)
protected void	passivate()
CallableStatement	prepareCall(String sql)
CallableStatement	prepareCall(String sql, int resultSetType, int resultSetConcurrency)
CallableStatement	prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
PreparedStatement	prepareStatement(String sql)
PreparedStatement	prepareStatement(String sql, int autoGeneratedKeys)
PreparedStatement	prepareStatement(String sql, int[] columnIndexes)
PreparedStatement	prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
PreparedStatement	prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
PreparedStatement	prepareStatement(String sql, String[] columnNames)
void	releaseSavepoint(Savepoint savepoint)
void	rollback()
void	rollback(Savepoint savepoint)
void	setAutoCommit(boolean autoCommit)
void	setCacheState(boolean cacheState)	Sets the state caching flag.
void	setCatalog(String catalog)
void	setClientInfo(String name, String value)
void	setClientInfo(Properties properties)
protected void	setClosedInternal(boolean closed)
void	setDefaultQueryTimeout(Integer defaultQueryTimeoutSeconds)	Sets the default query timeout that will be used for Statements created from this connection.
void	setDelegate(C connection)	Sets my delegate.
void	setHoldability(int holdability)
void	setNetworkTimeout(Executor executor, int milliseconds)
void	setReadOnly(boolean readOnly)
Savepoint	setSavepoint()
Savepoint	setSavepoint(String name)
void	setSchema(String schema)
void	setTransactionIsolation(int level)
void	setTypeMap(Map<String,Class<?>> map)
String	toString()	Returns a string representation of the metadata associated with the innermost delegate connection.
<T> T	unwrap(Class<T> iface)

Methods inherited from class org.datanucleus.store.rdbms.datasource.dbcp2.AbandonedTrace

addTrace, clearTrace, getLastUsed, getTrace, removeThisTrace, removeTrace, setLastUsed, setLastUsed

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.sql.Connection

beginRequest, endRequest, setShardingKey, setShardingKey, setShardingKeyIfValid, setShardingKeyIfValid

Constructor Detail

DelegatingConnection

public DelegatingConnection(C c)

Creates a wrapper for the Connection which traces this Connection in the AbandonedObjectPool.

Parameters:

c - the Connection to delegate all calls to.

Method Detail

toString

public String toString()

Returns a string representation of the metadata associated with the innermost delegate connection.

Overrides:

toString in class Object

getDelegate

public C getDelegate()

Returns my underlying Connection.

Returns:

my underlying Connection.

getDelegateInternal

protected final C getDelegateInternal()

innermostDelegateEquals

public boolean innermostDelegateEquals(Connection c)

Compares innermost delegate to the given connection.

Parameters:

c - connection to compare innermost delegate with

Returns:

true if innermost delegate equals c

getInnermostDelegate

public Connection getInnermostDelegate()

If my underlying Connection is not a DelegatingConnection, returns it, otherwise recursively invokes this method on my delegate.

Hence this method will return the first delegate that is not a DelegatingConnection, or null when no non-DelegatingConnection delegate can be found by traversing this chain.

This method is useful when you may have nested DelegatingConnections, and you want to make sure to obtain a "genuine" Connection.

Returns:

innermost delegate.

getInnermostDelegateInternal

public final Connection getInnermostDelegateInternal()

Although this method is public, it is part of the internal API and should not be used by clients. The signature of this method may change at any time including in ways that break backwards compatibility.

Returns:

innermost delegate.

setDelegate

public void setDelegate(C connection)

Sets my delegate.

Parameters:

connection - my delegate.

close

public void close()
           throws SQLException

Closes the underlying connection, and close any Statements that were not explicitly closed. Sub-classes that override this method must:

1. Call passivate()
2. Call close (or the equivalent appropriate action) on the wrapped connection
3. Set _closed to false

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Connection

Throws:

SQLException

isClosedInternal

protected boolean isClosedInternal()

setClosedInternal

protected void setClosedInternal(boolean closed)

closeInternal

protected final void closeInternal()
                            throws SQLException

Throws:

SQLException

handleException

protected void handleException(SQLException e)
                        throws SQLException

Throws:

SQLException

handleExceptionNoThrow

protected <T extends Throwable> T handleExceptionNoThrow(T e)

Handles the given SQLException.

Type Parameters:

T - The throwable type.

Parameters:

e - The SQLException

Returns:

the given SQLException

Since:

2.7.0

createStatement

public Statement createStatement()
                          throws SQLException

Specified by:

createStatement in interface Connection

Throws:

SQLException

createStatement

public Statement createStatement(int resultSetType,
                                 int resultSetConcurrency)
                          throws SQLException

Specified by:

createStatement in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql)
                                   throws SQLException

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          int resultSetType,
                                          int resultSetConcurrency)
                                   throws SQLException

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareCall

public CallableStatement prepareCall(String sql)
                              throws SQLException

Specified by:

prepareCall in interface Connection

Throws:

SQLException

prepareCall

public CallableStatement prepareCall(String sql,
                                     int resultSetType,
                                     int resultSetConcurrency)
                              throws SQLException

Specified by:

prepareCall in interface Connection

Throws:

SQLException

clearWarnings

public void clearWarnings()
                   throws SQLException

Specified by:

clearWarnings in interface Connection

Throws:

SQLException

commit

public void commit()
            throws SQLException

Specified by:

commit in interface Connection

Throws:

SQLException

getCacheState

public boolean getCacheState()

Returns the state caching flag.

Returns:

the state caching flag

getAutoCommit

public boolean getAutoCommit()
                      throws SQLException

Specified by:

getAutoCommit in interface Connection

Throws:

SQLException

getCatalog

public String getCatalog()
                  throws SQLException

Specified by:

getCatalog in interface Connection

Throws:

SQLException

getMetaData

public DatabaseMetaData getMetaData()
                             throws SQLException

Specified by:

getMetaData in interface Connection

Throws:

SQLException

getTransactionIsolation

public int getTransactionIsolation()
                            throws SQLException

Specified by:

getTransactionIsolation in interface Connection

Throws:

SQLException

getTypeMap

public Map<String,Class<?>> getTypeMap()
                                      throws SQLException

Specified by:

getTypeMap in interface Connection

Throws:

SQLException

getWarnings

public SQLWarning getWarnings()
                       throws SQLException

Specified by:

getWarnings in interface Connection

Throws:

SQLException

isReadOnly

public boolean isReadOnly()
                   throws SQLException

Specified by:

isReadOnly in interface Connection

Throws:

SQLException

nativeSQL

public String nativeSQL(String sql)
                 throws SQLException

Specified by:

nativeSQL in interface Connection

Throws:

SQLException

rollback

public void rollback()
              throws SQLException

Specified by:

rollback in interface Connection

Throws:

SQLException

getDefaultQueryTimeout

public Integer getDefaultQueryTimeout()

Gets the default query timeout that will be used for Statements created from this connection. null means that the driver default will be used.

Returns:

query timeout limit in seconds; zero means there is no limit.

setDefaultQueryTimeout

public void setDefaultQueryTimeout(Integer defaultQueryTimeoutSeconds)

Sets the default query timeout that will be used for Statements created from this connection. null means that the driver default will be used.

Parameters:

defaultQueryTimeoutSeconds - the new query timeout limit in seconds; zero means there is no limit

setCacheState

public void setCacheState(boolean cacheState)

Sets the state caching flag.

Parameters:

cacheState - The new value for the state caching flag

clearCachedState

public void clearCachedState()

Can be used to clear cached state when it is known that the underlying connection may have been accessed directly.

setAutoCommit

public void setAutoCommit(boolean autoCommit)
                   throws SQLException

Specified by:

setAutoCommit in interface Connection

Throws:

SQLException

setCatalog

public void setCatalog(String catalog)
                throws SQLException

Specified by:

setCatalog in interface Connection

Throws:

SQLException

setReadOnly

public void setReadOnly(boolean readOnly)
                 throws SQLException

Specified by:

setReadOnly in interface Connection

Throws:

SQLException

setTransactionIsolation

public void setTransactionIsolation(int level)
                             throws SQLException

Specified by:

setTransactionIsolation in interface Connection

Throws:

SQLException

setTypeMap

public void setTypeMap(Map<String,Class<?>> map)
                throws SQLException

Specified by:

setTypeMap in interface Connection

Throws:

SQLException

isClosed

public boolean isClosed()
                 throws SQLException

Specified by:

isClosed in interface Connection

Throws:

SQLException

checkOpen

protected void checkOpen()
                  throws SQLException

Throws:

SQLException

activate

protected void activate()

passivate

protected void passivate()
                  throws SQLException

Throws:

SQLException

getHoldability

public int getHoldability()
                   throws SQLException

Specified by:

getHoldability in interface Connection

Throws:

SQLException

setHoldability

public void setHoldability(int holdability)
                    throws SQLException

Specified by:

setHoldability in interface Connection

Throws:

SQLException

setSavepoint

public Savepoint setSavepoint()
                       throws SQLException

Specified by:

setSavepoint in interface Connection

Throws:

SQLException

setSavepoint

public Savepoint setSavepoint(String name)
                       throws SQLException

Specified by:

setSavepoint in interface Connection

Throws:

SQLException

rollback

public void rollback(Savepoint savepoint)
              throws SQLException

Specified by:

rollback in interface Connection

Throws:

SQLException

releaseSavepoint

public void releaseSavepoint(Savepoint savepoint)
                      throws SQLException

Specified by:

releaseSavepoint in interface Connection

Throws:

SQLException

createStatement

public Statement createStatement(int resultSetType,
                                 int resultSetConcurrency,
                                 int resultSetHoldability)
                          throws SQLException

Specified by:

createStatement in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          int resultSetType,
                                          int resultSetConcurrency,
                                          int resultSetHoldability)
                                   throws SQLException

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareCall

public CallableStatement prepareCall(String sql,
                                     int resultSetType,
                                     int resultSetConcurrency,
                                     int resultSetHoldability)
                              throws SQLException

Specified by:

prepareCall in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          int autoGeneratedKeys)
                                   throws SQLException

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          int[] columnIndexes)
                                   throws SQLException

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          String[] columnNames)
                                   throws SQLException

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

isWrapperFor

public boolean isWrapperFor(Class<?> iface)
                     throws SQLException

Specified by:

isWrapperFor in interface Wrapper

Throws:

SQLException

unwrap

public <T> T unwrap(Class<T> iface)
             throws SQLException

Specified by:

unwrap in interface Wrapper

Throws:

SQLException

createArrayOf

public Array createArrayOf(String typeName,
                           Object[] elements)
                    throws SQLException

Specified by:

createArrayOf in interface Connection

Throws:

SQLException

createBlob

public Blob createBlob()
                throws SQLException

Specified by:

createBlob in interface Connection

Throws:

SQLException

createClob

public Clob createClob()
                throws SQLException

Specified by:

createClob in interface Connection

Throws:

SQLException

createNClob

public NClob createNClob()
                  throws SQLException

Specified by:

createNClob in interface Connection

Throws:

SQLException

createSQLXML

public SQLXML createSQLXML()
                    throws SQLException

Specified by:

createSQLXML in interface Connection

Throws:

SQLException

createStruct

public Struct createStruct(String typeName,
                           Object[] attributes)
                    throws SQLException

Specified by:

createStruct in interface Connection

Throws:

SQLException

isValid

public boolean isValid(int timeoutSeconds)
                throws SQLException

Specified by:

isValid in interface Connection

Throws:

SQLException

setClientInfo

public void setClientInfo(String name,
                          String value)
                   throws SQLClientInfoException

Specified by:

setClientInfo in interface Connection

Throws:

SQLClientInfoException

setClientInfo

public void setClientInfo(Properties properties)
                   throws SQLClientInfoException

Specified by:

setClientInfo in interface Connection

Throws:

SQLClientInfoException

getClientInfo

public Properties getClientInfo()
                         throws SQLException

Specified by:

getClientInfo in interface Connection

Throws:

SQLException

getClientInfo

public String getClientInfo(String name)
                     throws SQLException

Specified by:

getClientInfo in interface Connection

Throws:

SQLException

setSchema

public void setSchema(String schema)
               throws SQLException

Specified by:

setSchema in interface Connection

Throws:

SQLException

getSchema

public String getSchema()
                 throws SQLException

Specified by:

getSchema in interface Connection

Throws:

SQLException

abort

public void abort(Executor executor)
           throws SQLException

Specified by:

abort in interface Connection

Throws:

SQLException

setNetworkTimeout

public void setNetworkTimeout(Executor executor,
                              int milliseconds)
                       throws SQLException

Specified by:

setNetworkTimeout in interface Connection

Throws:

SQLException

getNetworkTimeout

public int getNetworkTimeout()
                      throws SQLException

Specified by:

getNetworkTimeout in interface Connection

Throws:

SQLException