litesoft
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// This Source Code is in the Public Domain per: http://unlicense.org package org.litesoft.GWT.eventbus.server.nonpublic; import org.litesoft.GWT.eventbus.client.*; import org.litesoft.GWT.eventbus.client.nonpublic.*; import org.litesoft.GWT.eventbus.server.*; import org.litesoft.commonfoundation.base.*; import org.litesoft.logger.*; import org.litesoft.sequences.*; import javax.servlet.http.*; import java.util.*; public class ServerEventBusManager implements ServerEventBusBroadcaster { private static final Logger LOGGER = LoggerFactory.getLogger( ServerEventBusManager.class ); public static final ServerEventBusManager INSTANCE = new ServerEventBusManager(); private ServerEventBusManager() { } private static final String SERVER_EVENT_BUSES = "ServerEventBuses"; private static final Long MAX_CLIENT_ID = (long) (Integer.MAX_VALUE - 2000); private static SequenceSource sClientIdNumberSequenceSource = SequenceSource.NULL; public static synchronized void setClientIdNumberSequenceSource( SequenceSource pSequenceSource ) { sClientIdNumberSequenceSource = (pSequenceSource != null) ? pSequenceSource : SequenceSource.NULL; } public static synchronized int getNextClientIdNumber() { long cid = sClientIdNumberSequenceSource.getNextSequenceNumber( SERVER_EVENT_BUSES, MAX_CLIENT_ID ); return (int) cid; } private final NodeMap mNodes = new NodeMap(); public EventPackage getPackageForNewServerEventBus( int pClientIdNumber ) { return null; } public TemporaryServerEventBus createTemporaryServerEventBus( String pWhy, ServerEventBus pParent, ClientWindowInstanceDataManager pInitialClientWindowInstanceData ) { int zClientIdNumber = getNextClientIdNumber(); TemporaryServerEventBus zTempSEB = new TemporaryServerEventBus( zClientIdNumber ); synchronized ( mNodes ) { zTempSEB.initialize( pWhy, pParent.getClientIdNumber(), pInitialClientWindowInstanceData ); } // Force use of same stuff ServerEventBusSessionMapper.addServerEventBus( pParent, zTempSEB ); return zTempSEB; } public TemporaryServerEventBus createTemporaryServerEventBus( String pWhy, HttpServletRequest pRequest, ThreadLocalContextFactory pThreadLocalContextFactory, ClientWindowInstanceDataManager pInitialClientWindowInstanceData ) { int zClientIdNumber = getNextClientIdNumber(); TemporaryServerEventBus zTempSEB = new TemporaryServerEventBus( zClientIdNumber ); synchronized ( mNodes ) { zTempSEB.initialize( pWhy, null, pInitialClientWindowInstanceData ); } ServerEventBusSessionMapper.addServerEventBus( pRequest, pThreadLocalContextFactory, zTempSEB ); return zTempSEB; } /** * @return may return null */ public Integer getParentClientID( int pClientIdNumber ) { return mNodes.getNode( pClientIdNumber ).getParentClientID(); } /** * @return may return null */ public ServerEventBus getServerEventBus( int pClientIdNumber ) { return mNodes.getServerEventBusOrDisposedZombie( pClientIdNumber ); } /** * @return may return null */ public ServerEventBus getRootServerEventBus( int pClientIdNumber ) { return mNodes.getRootNode( pClientIdNumber ).getServerEventBus(); } /** * @return may return null */ public ServerEventBus getParentServerEventBus( int pClientIdNumber ) { return mNodes.getParentNode( pClientIdNumber ).getServerEventBus(); } /** * @return may return an empty array, but never null */ public ServerEventBus[] getAllServerEventBuses() { return SelectorAll.INSTANCE.select( mNodes.getNodes() ); } /** * @return may return an empty array, but never null */ public ServerEventBus[] getChildrenServerEventBuses( int pClientIdNumber ) { return new SelectorChildren( pClientIdNumber ).select( mNodes.getNodes() ); } /** * @return may return an empty array, but never null */ public ServerEventBus[] getAllRelatedServerEventBuses( int pClientIdNumber ) { Node rootNode = mNodes.getRootNode( pClientIdNumber ); return rootNode.isReal() ? // new SelectorAllRelated().select( rootNode, mNodes.getNodes() ) : // ServerEventBus.EMPTY_ARRAY; } public void broadcast( EventPackage pEventPackage ) { if ( pEventPackage != null ) { ServerEventBus[] buses = getAllServerEventBuses(); if ( buses != null ) { for ( ServerEventBus bus : buses ) { if ( bus != null ) { bus.publishIfNotDisposed( pEventPackage ); } } } } } public static class BackDoor { public static ServerEventBus updateServerEventBus( ServerEventBus pNewSEB, Integer pParentClientID ) { return ServerEventBusManager.INSTANCE.mNodes.updateServerEventBus( pNewSEB, pParentClientID ); } } private static class Node { private int mClientID; private Integer mParentClientID; private ServerEventBus mServerEventBus; private int mChildCount = 0; public Node( Integer pParentClientID, int pClientID, ServerEventBus pServerEventBus ) { mParentClientID = pParentClientID; mClientID = pClientID; mServerEventBus = pServerEventBus; } public String toString() { return "" + mClientID + ":" + ((getServerEventBus() != null) ? "SEB" : "---") + " ^" + mParentClientID + " c:" + mChildCount; } public int getClientID() { return mClientID; } public Integer getParentClientID() { return mParentClientID; } public synchronized ServerEventBus getServerEventBus() { return mServerEventBus; } public synchronized void replaceServerEventBus( ServerEventBus pServerEventBus ) { mServerEventBus = pServerEventBus; } public synchronized ServerEventBus clearServerEventBus() { ServerEventBus rv = mServerEventBus; mServerEventBus = null; return rv; } public synchronized boolean shouldRemove() { return isReal() && (mServerEventBus == null) && (mChildCount < 1); } public synchronized void incChildCount() { mChildCount++; } public synchronized void decChildCount() { mChildCount--; } public boolean isReal() { return true; } } private static final Node NULL_NODE = new Node( null, 0, null ) { public boolean isReal() { return false; } public void incChildCount() { } public void decChildCount() { } }; private abstract static class AbstractSelector { public ServerEventBus[] select( Node[] pNodes ) { List<ServerEventBus> buses = new ArrayList<ServerEventBus>(); addAppropriate( buses, pNodes ); return buses.toArray( new ServerEventBus[buses.size()] ); } protected void addAppropriate( List<ServerEventBus> pBuses, Node[] pNodes ) { for ( Node node : pNodes ) { ServerEventBus seb = node.getServerEventBus(); if ( (seb != null) && acceptable( node, seb ) ) { pBuses.add( seb ); } } } protected boolean acceptable( Node pNode, ServerEventBus pSEB ) { return true; } } private static class SelectorAll extends AbstractSelector { public static final AbstractSelector INSTANCE = new SelectorAll(); } private static class SelectorChildren extends AbstractSelector { private Integer mParentID; public SelectorChildren( int pParentID ) { mParentID = pParentID; } protected boolean acceptable( Node pNode, ServerEventBus pSEB ) { return mParentID.equals( pNode.getParentClientID() ); } } private static class SelectorAllRelated { public ServerEventBus[] select( Node pRoot, Node[] pNodes ) { List<ServerEventBus> buses = new ArrayList<ServerEventBus>(); new Adder( buses, pNodes ).addAppropriate( pRoot ); return buses.toArray( new ServerEventBus[buses.size()] ); } private static class Adder { private List<ServerEventBus> mBuses; private Node[] mNodes; public Adder( List<ServerEventBus> pBuses, Node[] pNodes ) { mBuses = pBuses; mNodes = pNodes; } public void addAppropriate( Node pCurrent ) { ServerEventBus seb = pCurrent.getServerEventBus(); if ( seb != null ) { mBuses.add( seb ); } Integer parentID = pCurrent.getClientID(); for ( Node node : mNodes ) { if ( parentID.equals( node.getParentClientID() ) ) { addAppropriate( node ); } } } } } private static class NodeMap implements ServerEventBusDisposeListener { private final Map<Integer, Node> mServerEventBusNodes = new HashMap<Integer, Node>(); private final Set<Integer> mDisposedServerEventBuses = new HashSet<Integer>(); public Node getNode( Integer pClientIdNumberFromParentReference ) { return (pClientIdNumberFromParentReference == null) ? // NULL_NODE : // getNode( pClientIdNumberFromParentReference.intValue() ); } public Node getNode( int pClientIdNumber ) { Node node = getRealNode( pClientIdNumber ); return (node != null) ? node : NULL_NODE; } public Node getRequiredNode( int pClientIdNumber ) { Node node = getRealNode( pClientIdNumber ); if ( node == null ) { throw new IllegalStateException( "No ServerEventBus Node for ClientID: " + pClientIdNumber ); } return node; } // from ServerEventBusDisposeListener public void init( IServerEventBus pServerEventBus ) { } // from ServerEventBusDisposeListener public void disposing( IServerEventBus pServerEventBus ) { int clientId = pServerEventBus.getClientIdNumber(); List<ServerEventBus> mAncestors = Collections.emptyList(); ServerEventBus zExistingSEB; synchronized ( this ) { Node node = getNode( clientId ); zExistingSEB = node.clearServerEventBus(); if ( null != zExistingSEB ) { mAncestors = getAncestors( node ); mDisposedServerEventBuses.add( clientId ); } while ( node.shouldRemove() ) { mServerEventBusNodes.remove( node.getClientID() ); node = getNode( node.getParentClientID() ); node.decChildCount(); } } if ( zExistingSEB instanceof NonTemporaryServerEventBus ) { LOGGER.debug.log( "---Disposed: ", zExistingSEB ); } notifyAncestorsOfRemovedDecendant( mAncestors, clientId ); } public synchronized ServerEventBus getServerEventBusOrDisposedZombie( int pClientIdNumber ) { ServerEventBus zBus = getNode( pClientIdNumber ).getServerEventBus(); if ( zBus != null ) { return zBus; } return mDisposedServerEventBuses.contains( pClientIdNumber ) ? // ZombieServerEventBus.INSTANCE : // null; } public synchronized Node getRealNode( int pClientIdNumber ) { return mServerEventBusNodes.get( pClientIdNumber ); } public synchronized Node[] getNodes() { return mServerEventBusNodes.values().toArray( new Node[mServerEventBusNodes.size()] ); } public synchronized Node getParentNode( int pClientIdNumber ) { Integer parentClientID = getNode( pClientIdNumber ).getParentClientID(); return getNode( parentClientID ); } public synchronized Node getRootNode( int pClientIdNumber ) { Node node = getNode( pClientIdNumber ); for ( Integer parentClientID; null != (parentClientID = node.getParentClientID()); ) { node = getNode( parentClientID ); } return node; } public ServerEventBus updateServerEventBus( ServerEventBus pNewSEB, Integer pParentClientID ) { if ( !pNewSEB.getType().isManagable() ) { throw badType( "Managable", pNewSEB ); } int clientId = pNewSEB.getClientIdNumber(); ServerEventBus zExistingSEB = null; List<ServerEventBus> mAncestors = Collections.emptyList(); synchronized ( this ) { Node node = getRealNode( clientId ); if ( node != null ) { zExistingSEB = node.getServerEventBus(); if ( zExistingSEB != null ) { mAncestors = getAncestors( node ); // Since we are replacing we do NOT want to get the dispose notice on the old! zExistingSEB.removeListener( this ); if ( !pNewSEB.getType().isUpdateReplacable() ) { throw badType( "UpdateReplacable", pNewSEB ); } } node.replaceServerEventBus( pNewSEB ); if ( !Currently.areEqual( pParentClientID, node.getParentClientID() ) ) { throw new IllegalStateException( "Mismatched Parent Client IDs (" + node.getParentClientID() + ":Existing - New:" + pParentClientID + ") for Client ID: " + clientId ); } } else { mServerEventBusNodes.put( clientId, new Node( pParentClientID, clientId, pNewSEB ) ); if ( pParentClientID != null ) { getNode( pParentClientID ).incChildCount(); } } } if ( pNewSEB instanceof NonTemporaryServerEventBus ) { LOGGER.debug.log( "---Alive---: ", pNewSEB ); } pNewSEB.addListener( this ); notifyAncestorsOfAddedDecendant( mAncestors, clientId ); return zExistingSEB; } private IllegalStateException badType( String pWhy, ServerEventBus pNewSEB ) { return new IllegalStateException( "Not " + pWhy + ": " + pNewSEB.getType() + " ServerEventBus!" ); } /** * called under lock */ private List<ServerEventBus> getAncestors( Node pNode ) { List<ServerEventBus> zBuses = new ArrayList<ServerEventBus>(); for ( Integer parentClientID; null != (parentClientID = pNode.getParentClientID()); ) { pNode = getNode( parentClientID ); ServerEventBus zBus = pNode.getServerEventBus(); if ( zBus != null ) { zBuses.add( zBus ); } } return zBuses; } /** * called unsynchronized */ private void notifyAncestorsOfAddedDecendant( List<ServerEventBus> pAncestors, int pClientId ) { notifyAncestorsWith( pAncestors, pClientId, true ); } /** * called unsynchronized */ private void notifyAncestorsOfRemovedDecendant( List<ServerEventBus> pAncestors, int pClientId ) { notifyAncestorsWith( pAncestors, pClientId, false ); } /** * called unsynchronized */ private void notifyAncestorsWith( List<ServerEventBus> pAncestors, int pClientId, boolean pAdd ) { if ( !pAncestors.isEmpty() ) { EventPackage eventPackage = new NotificationReDecendantEventPackage( "ServerEventBusManager", pClientId, pAdd ); for ( ServerEventBus zAncestor : pAncestors ) { zAncestor.publish( eventPackage ); } } } } } |
Commits for litesoft/trunk/Java/GWT/OldServer/src/org/litesoft/GWT/eventbus/server/nonpublic/ServerEventBusManager.java
Revision | Author | Commited | Message |
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950 Diff | GeorgeS | Thu 19 Jun, 2014 17:57:04 +0000 | New Lines |
948 Diff | GeorgeS | Sat 07 Jun, 2014 23:42:39 +0000 | Jusefuls Formatter Updated to New Code Format |
947 Diff | GeorgeS | Fri 06 Jun, 2014 23:36:56 +0000 | Correct Spelling of package! |
939 Diff | GeorgeS | Mon 02 Jun, 2014 21:30:31 +0000 | Extracting commonfoundation |
804 Diff | GeorgeS | Wed 15 Aug, 2012 12:48:51 +0000 | |
49 Diff | GeorgeS | Mon 12 Apr, 2010 02:59:10 +0000 | License Text |
2 | GeorgeS | Sun 07 Feb, 2010 12:50:58 +0000 |