de.zib.scalaris

Class ScalarisVM

java.lang.Object

de.zib.scalaris.ScalarisVM

public class ScalarisVM
extends Object

Provides methods to interact with a specific Scalaris (Erlang) VM.

Since:

3.6

Version:

3.10

Author:

Nico Kruber, kruber@zib.de

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ScalarisVM.AddNodesResult Plain old data object for results of addNodes(int).
static class	ScalarisVM.DeleteNodesByNameResult Plain old data object for results of shutdownNodes(int), shutdownNodesByName(List), killNodes(int) and killNodes(List).
static class	ScalarisVM.GetInfoResult Plain old data object for results of getInfo().

Constructor Summary

Constructors

Constructor and Description
ScalarisVM(PeerNode node) Creates a connection to the erlang VM of the given Scalaris node.
ScalarisVM(String node) Creates a connection to the erlang VM of the given Scalaris node.

Method Summary

Methods

Modifier and Type	Method and Description
ScalarisVM.AddNodesResult	addNodes(int number) Adds the given number of nodes to the Scalaris VM of the current connection.
void	closeConnection() Closes the transaction's connection to a scalaris node.
ScalarisVM.GetInfoResult	getInfo() Gets some information about the VM and Scalaris.
List<ErlangValue>	getNodes() Gets the names of the nodes in the Scalaris VM of the current connection.
int	getNumberOfNodes() Gets the number of nodes in the Scalaris VM of the current connection.
List<String>	getOtherVMs(int max) Retrieves additional nodes from the Scalaris VM of the current connection for use by ConnectionFactory.addNode(String).
String	getVersion() Gets the version of the Scalaris VM of the current connection.
boolean	killNode(ErlangValue name) Kills the given node inside the Scalaris VM of the current connection.
List<ErlangValue>	killNodes(int number) Kills the given number of nodes inside the Scalaris VM of the current connection.
ScalarisVM.DeleteNodesByNameResult	killNodes(List<ErlangValue> names) Kills the given nodes inside the Scalaris VM of the current connection.
void	killVM() Kills the Scalaris VM of the current connection.
boolean	shutdownNode(ErlangValue name) Shuts down the given node (graceful leave) inside the Scalaris VM of the current connection.
List<ErlangValue>	shutdownNodes(int number) Shuts down the given number of nodes (graceful leave) inside the Scalaris VM of the current connection.
ScalarisVM.DeleteNodesByNameResult	shutdownNodesByName(List<ErlangValue> names) Shuts down the given nodes (graceful leave) inside the Scalaris VM of the current connection.
void	shutdownVM() Tells the Scalaris VM of the current connection to shut down gracefully.

Methods inherited from class java.lang.Object

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

Constructor Detail

ScalarisVM

public ScalarisVM(PeerNode node)
           throws ConnectionException

Creates a connection to the erlang VM of the given Scalaris node. Uses the connection policy of the global connection factory.

Parameters:

node - Scalaris node to connect with

Throws:

ConnectionException - if the connection fails or the connection policy is not cloneable

ScalarisVM

public ScalarisVM(String node)
           throws ConnectionException

Creates a connection to the erlang VM of the given Scalaris node. Uses the connection policy of the global connection factory.

Parameters:

node - Scalaris node to connect with

Throws:

ConnectionException - if the connection fails or the connection policy is not cloneable

Method Detail

getVersion

public String getVersion()
                  throws ConnectionException,
                         UnknownException

Gets the version of the Scalaris VM of the current connection.

Returns:

Scalaris version string

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

getInfo

public ScalarisVM.GetInfoResult getInfo()
                                 throws ConnectionException,
                                        UnknownException

Gets some information about the VM and Scalaris.

Returns:

VM information

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

getNumberOfNodes

public int getNumberOfNodes()
                     throws ConnectionException,
                            UnknownException

Gets the number of nodes in the Scalaris VM of the current connection.

Returns:

number of nodes

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

getNodes

public List<ErlangValue> getNodes()
                           throws ConnectionException,
                                  UnknownException

Gets the names of the nodes in the Scalaris VM of the current connection.

Returns:

the names of the nodes (arbitrary type!)

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

addNodes

public ScalarisVM.AddNodesResult addNodes(int number)
                                   throws ConnectionException,
                                          UnknownException

Adds the given number of nodes to the Scalaris VM of the current connection.

Parameters:

number - number of nodes to add

Returns:

result of the operation

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

shutdownNode

public boolean shutdownNode(ErlangValue name)
                     throws ConnectionException,
                            UnknownException

Shuts down the given node (graceful leave) inside the Scalaris VM of the current connection.

Parameters:

name - the name of a node

Returns:

true if the node was shut down, false if the node was not found

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

killNode

public boolean killNode(ErlangValue name)
                 throws ConnectionException,
                        UnknownException

Kills the given node inside the Scalaris VM of the current connection.

Parameters:

name - the name of a node

Returns:

true if the node was shut down, false if the node was not found

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

shutdownNodes

public List<ErlangValue> shutdownNodes(int number)
                                throws ConnectionException,
                                       UnknownException

Shuts down the given number of nodes (graceful leave) inside the Scalaris VM of the current connection.

Parameters:

number - number of nodes to shut down

Returns:

result of the operation

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

killNodes

public List<ErlangValue> killNodes(int number)
                            throws ConnectionException,
                                   UnknownException

Kills the given number of nodes inside the Scalaris VM of the current connection.

Parameters:

number - number of nodes to kill

Returns:

result of the operation

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

shutdownNodesByName

public ScalarisVM.DeleteNodesByNameResult shutdownNodesByName(List<ErlangValue> names)
                                                       throws ConnectionException,
                                                              UnknownException

Shuts down the given nodes (graceful leave) inside the Scalaris VM of the current connection.

Parameters:

names - names of the nodes to shut down

Returns:

result of the operation

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

killNodes

public ScalarisVM.DeleteNodesByNameResult killNodes(List<ErlangValue> names)
                                             throws ConnectionException,
                                                    UnknownException

Kills the given nodes inside the Scalaris VM of the current connection.

Parameters:

names - names of the nodes to kill

Returns:

result of the operation

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

getOtherVMs

public List<String> getOtherVMs(int max)
                         throws ConnectionException,
                                UnknownException

Retrieves additional nodes from the Scalaris VM of the current connection for use by ConnectionFactory.addNode(String).

Parameters:

max - maximum number of nodes to return (> 0)

Returns:

a list of nodes (may be empty!)

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

shutdownVM

public void shutdownVM()
                throws ConnectionException

Tells the Scalaris VM of the current connection to shut down gracefully.

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

killVM

public void killVM()
            throws ConnectionException

Kills the Scalaris VM of the current connection.

Throws:

ConnectionException - if the connection is not active or a communication error occurs or an exit signal was received or the remote node sends a message containing an invalid cookie

UnknownException - if any other error occurs

closeConnection

public void closeConnection()

Closes the transaction's connection to a scalaris node. Note: Subsequent calls to the other methods will throw ConnectionExceptions!