org.eclipse.scada.hd.client.net

Class ConnectionImpl

java.lang.Object

org.eclipse.scada.core.client.net.ConnectionBase

org.eclipse.scada.core.client.net.SessionConnectionBase

org.eclipse.scada.hd.client.net.ConnectionImpl

All Implemented Interfaces:

org.apache.mina.core.service.IoHandler, Connection, StatisticsProvider

public class ConnectionImpl
extends SessionConnectionBase
implements Connection

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<String,HistoricalItemInformation>	knownItems
protected Random	random
static String	VERSION

Fields inherited from class org.eclipse.scada.core.client.net.SessionConnectionBase

executor, SESSION_CLIENT_VERSION

Fields inherited from class org.eclipse.scada.core.client.net.ConnectionBase

messenger, session, statistics

Constructor Summary

Constructors

Constructor and Description
ConnectionImpl(ConnectionInformation connectionInformantion)

Method Summary

Methods

Modifier and Type	Method and Description
void	addListListener(ItemListListener listener) Add a new listener to the connection in order to receive item list updates.
void	closeQuery(QueryImpl queryImpl) Close a registered query
Query	createQuery(String itemId, QueryParameters parameters, QueryListener listener, boolean updateData) Create a new query on the server
Executor	getExecutor()
String	getRequiredVersion()
protected void	handleListUpdate(Message message)
protected void	handleQueryDataUpdate(Message message)
protected void	handleQueryParameterUpdate(Message message)
protected void	handleQueryStatusUpdate(Message message)
protected void	init()
void	removeListListener(ItemListListener listener) Remove a listener from the connection
protected void	sendCreateQuery(long id, String itemId, QueryParameters parameters, boolean updateData)
protected void	switchState(ConnectionState state, Throwable error, Map<String,String> properties)
void	updateQueryParameters(QueryImpl queryImpl, QueryParameters parameters)

Methods inherited from class org.eclipse.scada.core.client.net.SessionConnectionBase

addPrivilegeListener, dispose, getPrivileges, handlePrivChange, modifyFilterChain, onConnectionClosed, onConnectionEstablished, processSessionReply, removePrivilegeListener, requestSession

Methods inherited from class org.eclipse.scada.core.client.net.ConnectionBase

addConnectionStateListener, cancelConnection, connect, connect, connectFailed, disconnect, disconnect, exceptionCaught, finalize, getConnectionInformation, getConnectTimeout, getIntProperty, getMessageTimeout, getPingPeriod, getSessionProperties, getSocketReceiveBufferSize, getSocketSendBufferSize, getState, getStatistics, isConnected, messageReceived, messageSent, onConnectionBound, performConnect, performLookup, removeConnectionStateListener, resolvedRemoteAddress, sessionClosed, sessionCreated, sessionIdle, sessionOpened, setBound, setCallbackFactory, setupConnector

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.scada.core.client.Connection

addConnectionStateListener, addPrivilegeListener, connect, connect, disconnect, dispose, getConnectionInformation, getPrivileges, getSessionProperties, getState, removeConnectionStateListener, removePrivilegeListener, setCallbackFactory

Field Detail

random

protected final Random random

VERSION

public static final String VERSION

See Also:

Constant Field Values

knownItems

protected Map<String,HistoricalItemInformation> knownItems

Constructor Detail

ConnectionImpl

public ConnectionImpl(ConnectionInformation connectionInformantion)

Method Detail

getRequiredVersion

public String getRequiredVersion()

Specified by:

getRequiredVersion in class SessionConnectionBase

init

protected void init()

handleQueryParameterUpdate

protected void handleQueryParameterUpdate(Message message)

handleQueryStatusUpdate

protected void handleQueryStatusUpdate(Message message)

handleQueryDataUpdate

protected void handleQueryDataUpdate(Message message)

handleListUpdate

protected void handleListUpdate(Message message)

getExecutor

public Executor getExecutor()

switchState

protected void switchState(ConnectionState state,
               Throwable error,
               Map<String,String> properties)

Overrides:

switchState in class ConnectionBase

addListListener

public void addListListener(ItemListListener listener)

Description copied from interface: Connection

Add a new listener to the connection in order to receive item list updates.

A new listener will also receive any already known items.

Parameters:

listener - the listener to add

removeListListener

public void removeListListener(ItemListListener listener)

Description copied from interface: Connection

Remove a listener from the connection

Parameters:

listener - the listener to remove

createQuery

public Query createQuery(String itemId,
                QueryParameters parameters,
                QueryListener listener,
                boolean updateData)

Description copied from interface: Connection

Create a new query on the server

Parameters:

itemId - the historical item to query

parameters - the initial query parameters

listener - the listener that will receive data

updateData - true if the query should provide continuous updates, false if the query should only be executed once an not data updates should be delivered after the query state changed to QueryState.COMPLETE.

Returns:

a new query instance, null is never returned

sendCreateQuery

protected void sendCreateQuery(long id,
                   String itemId,
                   QueryParameters parameters,
                   boolean updateData)

updateQueryParameters

public void updateQueryParameters(QueryImpl queryImpl,
                         QueryParameters parameters)

closeQuery

public void closeQuery(QueryImpl queryImpl)

Close a registered query

Parameters:

queryImpl - the registered query to close