py4j.commands

Class CallCommand

java.lang.Object

py4j.commands.AbstractCommand

py4j.commands.CallCommand

All Implemented Interfaces:

Command

public class CallCommand
extends AbstractCommand

A CallCommand is responsible for parsing a call command and calling the method on the target object.

Currently, the call command assumes that a command is well-formed and that there is no communication problem (e.g., the source virtual machine disconnected in the middle of a command). This is a reasonable assumption because the two virtual machines are assumed to be on the same host.

TODO: Make the call command more robust to communication errors and ill-formed protocol.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CALL_COMMAND_NAME

Fields inherited from class py4j.commands.AbstractCommand

commandName, connection, gateway

Constructor Summary

Constructors

Constructor and Description
CallCommand()

Method Summary

Modifier and Type	Method and Description
void	execute(java.lang.String commandName, java.io.BufferedReader reader, java.io.BufferedWriter writer)

Methods inherited from class py4j.commands.AbstractCommand

getArguments, getCommandName, getStringArguments, init, invokeMethod

Methods inherited from class java.lang.Object

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

Field Detail

CALL_COMMAND_NAME

public static final java.lang.String CALL_COMMAND_NAME

See Also:

Constant Field Values

Constructor Detail

CallCommand

public CallCommand()

Method Detail

execute

public void execute(java.lang.String commandName,
                    java.io.BufferedReader reader,
                    java.io.BufferedWriter writer)
             throws Py4JException,
                    java.io.IOException

Specified by:

execute in interface Command

Specified by:

execute in class AbstractCommand

Parameters:

commandName - The command name that was extracted of the command.

reader - The reader from which to read the command parts. Each command part are expected to be on a separate line and readable through BufferedReader.readLine().

writer - The writer to which the return value should be written.

Throws:

Py4JException - If an error occurs while executing the command. All exceptions except IOException caused by the reader and the writer should be wrapper in a Py4JException instance.

java.io.IOException - If an error occurs while using the reader or the writer.