Class BackendConnection (0.27.0)

public class BackendConnection

This class emulates a backend PostgreSQL connection. Statements are buffered in memory until a flush/sync is received. This makes it possible to batch multiple statements together before sending these to Cloud Spanner. This class also keeps track of the transaction status of the connection.

Inheritance

java.lang.Object > BackendConnection

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Static Fields

MAX_PARTITIONS

public static final int MAX_PARTITIONS

Field Value
Type	Description
`int`

TRANSACTION_ABORTED_ERROR

public static final String TRANSACTION_ABORTED_ERROR

Field Value
Type	Description
`String`

Methods

analyze(String command, AbstractStatementParser.ParsedStatement parsedStatement, Statement statement)

public ListenableFuture<StatementResult> analyze(String command, AbstractStatementParser.ParsedStatement parsedStatement, Statement statement)

Parameters
Name	Description
`command`	`String`
`parsedStatement`	`ParsedStatement`
`statement`	`com.google.cloud.spanner.Statement`

Returns
Type	Description
`com.google.common.util.concurrent.ListenableFuture<StatementResult>`

execute(ReleaseStatement releaseStatement)

public Future<StatementResult> execute(ReleaseStatement releaseStatement)

Parameter
Name	Description
`releaseStatement`	`ReleaseStatement`

Returns
Type	Description
`Future<StatementResult>`

execute(RollbackToStatement rollbackToStatement)

public Future<StatementResult> execute(RollbackToStatement rollbackToStatement)

Parameter
Name	Description
`rollbackToStatement`	`RollbackToStatement`

Returns
Type	Description
`Future<StatementResult>`

execute(SavepointStatement savepointStatement)

public Future<StatementResult> execute(SavepointStatement savepointStatement)

Parameter
Name	Description
`savepointStatement`	`SavepointStatement`

Returns
Type	Description
`Future<StatementResult>`

execute(TruncateStatement truncateStatement)

public Future<StatementResult> execute(TruncateStatement truncateStatement)

Parameter
Name	Description
`truncateStatement`	`TruncateStatement`

Returns
Type	Description
`Future<StatementResult>`

execute(VacuumStatement vacuumStatement)

public Future<StatementResult> execute(VacuumStatement vacuumStatement)

Parameter
Name	Description
`vacuumStatement`	`VacuumStatement`

Returns
Type	Description
`Future<StatementResult>`

execute(String command, AbstractStatementParser.ParsedStatement parsedStatement, Statement statement, Function<Statement,Statement> statementBinder)

public Future<StatementResult> execute(String command, AbstractStatementParser.ParsedStatement parsedStatement, Statement statement, Function<Statement,Statement> statementBinder)

Buffers the given statement for execution on the backend connection when the next flush/sync message is received. The returned future will contain the result of the statement when execution has finished.

Parameters
Name	Description
`command`	`String`
`parsedStatement`	`ParsedStatement`
`statement`	`com.google.cloud.spanner.Statement`
`statementBinder`	`Function<com.google.cloud.spanner.Statement,com.google.cloud.spanner.Statement>`

Returns
Type	Description
`Future<StatementResult>`

executeCopy(AbstractStatementParser.ParsedStatement parsedStatement, Statement statement, CopyDataReceiver copyDataReceiver, MutationWriter mutationWriter, ExecutorService executor)

public Future<StatementResult> executeCopy(AbstractStatementParser.ParsedStatement parsedStatement, Statement statement, CopyDataReceiver copyDataReceiver, MutationWriter mutationWriter, ExecutorService executor)

Buffers the given COPY operation for execution on the backend connection when the next flush/sync message is received. The returned future will contain the result of the COPY operation when execution has finished.

Parameters
Name	Description
`parsedStatement`	`ParsedStatement`
`statement`	`com.google.cloud.spanner.Statement`
`copyDataReceiver`	`CopyDataReceiver`
`mutationWriter`	`MutationWriter`
`executor`	`ExecutorService`

Returns
Type	Description
`Future<StatementResult>`

executeCopyOut(AbstractStatementParser.ParsedStatement parsedStatement, Statement statement)

public Future<StatementResult> executeCopyOut(AbstractStatementParser.ParsedStatement parsedStatement, Statement statement)

Parameters
Name	Description
`parsedStatement`	`ParsedStatement`
`statement`	`com.google.cloud.spanner.Statement`

Returns
Type	Description
`Future<StatementResult>`

getConnectionState()

public BackendConnection.ConnectionState getConnectionState()

Returns the current connection state.

Returns
Type	Description
`BackendConnection.ConnectionState`

getCurrentDatabase()

public String getCurrentDatabase()

Returns the id of the database that this connection uses.

Returns
Type	Description
`String`

getCurrentSchema()

public String getCurrentSchema()

Returns the current schema that is used by this BackendConnection.

Returns
Type	Description
`String`

getSessionState()

public SessionState getSessionState()

Returns the session state of this connection.

Returns
Type	Description
`SessionState`

getSpannerConnection()

public Connection getSpannerConnection()

Returns the Spanner connection used by this BackendConnection.

Returns
Type	Description
`Connection`

initSessionSetting(String name, String value)

public void initSessionSetting(String name, String value)

Sets the initial value of a pg_settings setting for this connection. This method should only be called during startup with values that come from the connection request.

Parameters
Name	Description
`name`	`String`
`value`	`String`