litesoft
@ 939
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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.changemanagement.nonpublic; import java.io.*; import org.litesoft.commonfoundation.typeutils.Objects; import java.util.*; import java.util.concurrent.*; import org.litesoft.changemanagement.*; import org.litesoft.logger.*; public class LowLevelChangeListenerManager { private static final Logger LOGGER = LoggerFactory.getLogger( LowLevelChangeListenerManager.class ); private static abstract class InterestHelper { private ServerStateChangedListener mListener; protected InterestHelper( ServerStateChangedListener pListener ) { mListener = pListener; } public ServerStateChangedListener getListener() { return mListener; } public boolean isAll() { return false; } abstract public boolean isAll( String pName ); abstract public boolean hasAll( String[] pNames ); abstract public boolean hasAll( String pName, Serializable[] pUniqueKeys ); abstract public ServerStateChangeSet createListFrom( ServerStateChangeSet pAllChanges_Immutable ); } private Map<ServerStateChangedListener, InterestHelper> mListenersToHelpers = new HashMap<ServerStateChangedListener, InterestHelper>(); private InterestHelper[] mHelpers = null; public synchronized void clearAllListeners() { mHelpers = null; mListenersToHelpers.clear(); mRemoteListeners.clear(); } private synchronized void putHelper( InterestHelper pHelper ) { mHelpers = null; mListenersToHelpers.put( pHelper.getListener(), pHelper ); } private synchronized InterestHelper[] getHelpers() { if ( mHelpers == null ) { mHelpers = mListenersToHelpers.values().toArray( new InterestHelper[mListenersToHelpers.size()] ); } return mHelpers; } public synchronized void removeLocalListener( ServerStateChangedListener pListener ) { if ( pListener != null ) { if ( null != mListenersToHelpers.remove( pListener ) ) { mHelpers = null; } } } public synchronized void addLocalListener( ServerStateChangedListener pListener ) { if ( pListener != null ) { InterestHelper helper = mListenersToHelpers.get( pListener ); if ( (helper == null) || !helper.isAll() ) { putHelper( new AllInterestHelper( pListener ) ); } } } /** * @param pNames - normally just Object Class Names (getClass().getName()) */ public synchronized void addLocalListener( ServerStateChangedListener pListener, String... pNames ) { if ( Objects.areNotNull( pListener, pNames ) ) { InterestHelper helper = mListenersToHelpers.get( pListener ); if ( (helper == null) || !helper.hasAll( pNames ) ) { putHelper( new FilteringInterestHelper( pListener, helper, pNames ) ); } } } /** * @param pName - normally just Object Class Name (getClass().getName()) */ public void addLocalListener( ServerStateChangedListener pListener, String pName, Serializable... pUniqueKeys ) { if ( Objects.areNotNull( pListener, pName, pUniqueKeys ) ) { InterestHelper helper = mListenersToHelpers.get( pListener ); if ( (helper == null) || !helper.hasAll( pName, pUniqueKeys ) ) { putHelper( new FilteringInterestHelper( pListener, helper, pName, pUniqueKeys ) ); } } } public void removeRemoteListener( ServerStateChangedListener pListener ) { if ( pListener != null ) { mRemoteListeners.remove( pListener ); } } public void addRemoteListener( ServerStateChangedListener pListener ) { if ( pListener != null ) { mRemoteListeners.add( pListener ); } } public void distributeRemoteChanges( ServerStateChangeSet pRemoteChanges ) { if ( pRemoteChanges != null ) { notifyAllLocalListeners( pRemoteChanges ); } } private Set<ServerStateChangedListener> mRemoteListeners = new CopyOnWriteArraySet<ServerStateChangedListener>(); /** * @param pChange Not Null or Empty & is Immutable! */ public void notifyAllListeners( ServerStateChangeSet pChange ) { notifyAllLocalListeners( pChange ); notifyAllRemoteListeners( pChange ); } /** * @param pChange Not Null or Empty & is Immutable! */ public void notifyAllRemoteListeners( ServerStateChangeSet pChange ) { for ( ServerStateChangedListener listener : mRemoteListeners ) { notifyListener( listener, pChange ); } } public void waitForNotificationQueueEmpty() { mQueue.waitTillEmpty(); } /** * @param pAllChanges Not Null or Empty & is Immutable! */ private void notifyAllLocalListeners( ServerStateChangeSet pAllChanges ) { for ( InterestHelper helper : getHelpers() ) { ServerStateChangeSet zChanges = helper.createListFrom( pAllChanges ); if ( zChanges != null ) { notifyListener( helper.getListener(), zChanges ); } } } private void notifyListener( ServerStateChangedListener listener, ServerStateChangeSet pAllChanges ) { mQueue.put( listener, pAllChanges ); } private static class AllInterestHelper extends InterestHelper { public AllInterestHelper( ServerStateChangedListener pListener ) { super( pListener ); } @Override public boolean isAll() { return true; } @Override public boolean isAll( String pName ) { return true; } @Override public boolean hasAll( String[] pNames ) { return true; } @Override public boolean hasAll( String pName, Serializable[] pUniqueKeys ) { return true; } @Override public ServerStateChangeSet createListFrom( ServerStateChangeSet pAllChanges_Immutable ) { return pAllChanges_Immutable; } @Override public String toString() { return "All POs"; } } private static class FilteringInterestHelper extends InterestHelper { public FilteringInterestHelper( ServerStateChangedListener pListener, InterestHelper pHelper, String[] pNames ) { super( pListener ); for ( String zName : pNames ) { if ( zName != null ) { mNamesToKeyInterestHelpers.put( zName, new AllKeyInterestHelper( zName ) ); } } if ( pHelper != null ) { Collection<KeyInterestHelper> oldHelpers = ((FilteringInterestHelper) pHelper).mNamesToKeyInterestHelpers.values(); for ( KeyInterestHelper helper : oldHelpers ) { String key = helper.getClassName(); if ( !mNamesToKeyInterestHelpers.containsKey( key ) ) { mNamesToKeyInterestHelpers.put( key, helper ); } } } } public FilteringInterestHelper( ServerStateChangedListener pListener, InterestHelper pHelper, String pName, Serializable[] pUniqueKeys ) { super( pListener ); FilteringKeyInterestHelper newHelper = new FilteringKeyInterestHelper( pName, pUniqueKeys ); mNamesToKeyInterestHelpers.put( pName, newHelper ); if ( pHelper != null ) { Collection<KeyInterestHelper> oldHelpers = ((FilteringInterestHelper) pHelper).mNamesToKeyInterestHelpers.values(); for ( KeyInterestHelper helper : oldHelpers ) { String key = helper.getClassName(); if ( key.equals( pName ) ) { newHelper.addAll( (FilteringKeyInterestHelper) helper ); } else { mNamesToKeyInterestHelpers.put( key, helper ); } } } } private Map<String, KeyInterestHelper> mNamesToKeyInterestHelpers = new HashMap<String, KeyInterestHelper>(); @Override public String toString() { StringBuilder sb = new StringBuilder( "Only: " ); String[] keys = mNamesToKeyInterestHelpers.keySet().toArray( new String[mNamesToKeyInterestHelpers.size()] ); Arrays.sort( keys ); sb.append( mNamesToKeyInterestHelpers.get( keys[0] ) ); for ( int i = 1; i < keys.length; i++ ) { sb.append( ", " ).append( mNamesToKeyInterestHelpers.get( keys[i] ) ); } return sb.toString(); } private boolean isInterestedIn( ServerStateChange pChange ) { return (pChange != null) && isInterestedIn( pChange.getChangedObjectTypeName(), pChange.getChangedObjectUniqueKey() ); } private boolean isInterestedIn( String pName, Serializable pUniqueKey ) { KeyInterestHelper helper = mNamesToKeyInterestHelpers.get( pName ); return (helper != null) && helper.isInterestedIn( pUniqueKey ); } @Override public boolean isAll( String pName ) { KeyInterestHelper helper = mNamesToKeyInterestHelpers.get( pName ); return (helper != null) && helper.isAll(); } @Override public boolean hasAll( String[] pNames ) { for ( String zName : pNames ) { if ( (zName != null) && !isAll( zName ) ) { return false; } } return true; } @Override public boolean hasAll( String pName, Serializable[] pUniqueKeys ) { KeyInterestHelper helper = mNamesToKeyInterestHelpers.get( pName ); return (helper != null) && helper.isInterestedInAll( pUniqueKeys ); } @Override public ServerStateChangeSet createListFrom( ServerStateChangeSet pAllChanges ) { List<ServerStateChange> zAllChanges_Immutable = pAllChanges.getChanges(); int z1stOfInterest = get1stOfInterest( zAllChanges_Immutable ); if ( z1stOfInterest == -1 ) { return null; } int z1stNotOfInterest = get1stNotOfInterest( zAllChanges_Immutable, z1stOfInterest + 1 ); if ( z1stNotOfInterest == -1 ) { if ( z1stOfInterest == 0 ) { return pAllChanges; } z1stNotOfInterest = zAllChanges_Immutable.size(); } List<ServerStateChange> rv = new ArrayList<ServerStateChange>( zAllChanges_Immutable.size() - z1stOfInterest ); do { rv.add( zAllChanges_Immutable.get( z1stOfInterest++ ) ); } while ( z1stOfInterest < z1stNotOfInterest ); for ( int i = z1stNotOfInterest + 1; i < zAllChanges_Immutable.size(); i++ ) { ServerStateChange zChange = zAllChanges_Immutable.get( i ); if ( isInterestedIn( zChange ) ) { rv.add( zChange ); } } return new ServerStateChangeSet( pAllChanges, Collections.unmodifiableList( rv ) ); } private int get1stNotOfInterest( List<ServerStateChange> pList, int pFrom ) { for (; pFrom < pList.size(); pFrom++ ) { if ( !isInterestedIn( pList.get( pFrom ) ) ) { return pFrom; } } return -1; } private int get1stOfInterest( List<ServerStateChange> pList ) { for ( int i = 0; i < pList.size(); i++ ) { if ( isInterestedIn( pList.get( i ) ) ) { return i; } } return -1; } } private static abstract class KeyInterestHelper { private String mClassName; protected KeyInterestHelper( String pClassName ) { mClassName = pClassName; } public String getClassName() { return mClassName; } abstract public boolean isAll(); abstract public boolean isInterestedIn( Serializable pUniqueKey ); abstract public boolean isInterestedInAll( Serializable[] pUniqueKeys ); } private static class AllKeyInterestHelper extends KeyInterestHelper { public AllKeyInterestHelper( String pClassName ) { super( pClassName ); } @Override public boolean isAll() { return true; } @Override public boolean isInterestedIn( Serializable pUniqueKey ) { return true; } @Override public boolean isInterestedInAll( Serializable[] pUniqueKeys ) { return true; } @Override public String toString() { return getClassName(); } } private static class FilteringKeyInterestHelper extends KeyInterestHelper { private Set<Serializable> mUniqueKeys = new HashSet<Serializable>(); public FilteringKeyInterestHelper( String pClassName, Serializable[] pUniqueKeys ) { super( pClassName ); mUniqueKeys.addAll( Arrays.asList( pUniqueKeys ) ); } public FilteringKeyInterestHelper( String pClassName, Serializable pUniqueKey ) { super( pClassName ); mUniqueKeys.add( pUniqueKey ); } public void addAll( FilteringKeyInterestHelper pHelper ) { mUniqueKeys.addAll( pHelper.mUniqueKeys ); } @Override public boolean isAll() { return false; } @Override public boolean isInterestedIn( Serializable pUniqueKey ) { return mUniqueKeys.contains( pUniqueKey ); } @Override public boolean isInterestedInAll( Serializable[] pUniqueKeys ) { for ( Serializable key : pUniqueKeys ) { if ( !isInterestedIn( key ) ) { return false; } } return true; } @Override public String toString() { return getClassName() + mUniqueKeys; } } private static class NodeQueue { public NodeQueue start() { return this; } public void waitTillEmpty() { } public void put( ServerStateChangedListener pListener, ServerStateChangeSet pAllChanges ) { notifyListener( pListener, pAllChanges ); } protected final void notifyListener( ServerStateChangedListener pListener, ServerStateChangeSet pAllChanges ) { try { pListener.serverStateChanged( pAllChanges ); } catch ( RuntimeException e ) { LOGGER.error.log( e, " calling ", pListener, " with ", pAllChanges ); } } } private static class ThreadedNodeQueue extends NodeQueue implements Runnable { private static class Node { private ServerStateChangedListener mListener; private ServerStateChangeSet mAllChanges; private Node mNext = null; public Node( ServerStateChangedListener pListener, ServerStateChangeSet pAllChanges ) { mListener = pListener; mAllChanges = pAllChanges; } public ServerStateChangedListener getListener() { return mListener; } public ServerStateChangeSet getAllChanges() { return mAllChanges; } public Node getNext() { return mNext; } public void setNext( Node pNext ) { mNext = pNext; } } private Node mHead = null; private Node mTail = null; @Override public NodeQueue start() { Thread zThread = new Thread( this ); zThread.setDaemon( true ); zThread.start(); return this; } @SuppressWarnings({"InfiniteLoopStatement"}) @Override public void run() { while ( true ) { notifyNextListener(); } } @Override public synchronized void waitTillEmpty() { while ( mHead != null ) { try { wait(); } catch ( InterruptedException e ) { // Whatever... } } } private void notifyNextListener() { synchronized ( this ) { while ( mHead == null ) { try { wait(); } catch ( InterruptedException e ) { // Whatever... } } } notifyListener( mHead.getListener(), mHead.getAllChanges() ); synchronized ( this ) { if ( null == (mHead = mHead.getNext()) ) { mTail = null; } notifyAll(); } } @Override public synchronized void put( ServerStateChangedListener pListener, ServerStateChangeSet pAllChanges ) { Node zNode = new Node( pListener, pAllChanges ); if ( mTail == null ) { mHead = zNode; } else { mTail.setNext( zNode ); } mTail = zNode; notifyAll(); } } // private NodeQueue mQueue = new NodeQueue().start(); private NodeQueue mQueue = new ThreadedNodeQueue().start(); } |
Commits for litesoft/trunk/Java/core/Server/src/org/litesoft/changemanagement/nonpublic/LowLevelChangeListenerManager.java
Revision | Author | Commited | Message |
---|---|---|---|
939 Diff | GeorgeS | Mon 02 Jun, 2014 21:30:31 +0000 | Extracting commonfoundation |
917 Diff | GeorgeS | Sun 08 Dec, 2013 20:49:56 +0000 | 1.7 prep & VersionedStaticContentFilter upgrade to new “/ver” model! |
822 Diff | GeorgeS | Sun 19 Aug, 2012 01:03:51 +0000 | |
151 Diff | GeorgeS | Thu 17 Mar, 2011 04:16:22 +0000 | |
49 Diff | GeorgeS | Mon 12 Apr, 2010 02:59:10 +0000 | License Text |
24 Diff | GeorgeS | Wed 24 Feb, 2010 01:51:38 +0000 | |
2 | GeorgeS | Sun 07 Feb, 2010 12:50:58 +0000 |