org.geotools.arcsde.session
Class Command<R>
Object
Command<R>
- Direct Known Subclasses:
- Commands.CloseStateCommand, Commands.CloseStreamCommand, Commands.CreateAndExecuteQueryCommand, Commands.CreateSeRegistrationCommand, Commands.CreateSeStateCommand, Commands.CreateSeTableCommand, Commands.CreateVersionStateCommand, Commands.DescribeTableCommand, Commands.GetVersionCommand, GatherCoverageMetadataCommand
public abstract class Command<R>
- extends Object
Runnable used to interact with an ArcSDEConnection.
Instances of this class can be sent to Session#issue(Command)
in order to be executed. A
Command
has exclusive access to the connection
for the duration of
its execute
method.
This facility is used to prevent a series of complicated locks and try/catch/finally code.
- Author:
- Jody Garnett
- Module:
Method Summary |
abstract R |
execute(ISession session,
SeConnection connection)
Executed to operate on an SeConnection, a Command is scheduled for execution on a Session. |
Methods inherited from class Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Command
public Command()
execute
public abstract R execute(ISession session,
SeConnection connection)
throws SeException,
IOException
- Executed to operate on an SeConnection, a Command is scheduled for execution on a Session.
Please keep in mind that a Command should be short in duration; you are sharing this
SeConnection with other threads.
- Parameters:
session
- the Session the command is being executed insideconnection
- the session's connection, used to interact with ArcSDE
- Returns:
- the result of the command execution, or null if the command is not meant to return
anything (a command meant to return something should fail if not able to)
- Throws:
SeException
IOException
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