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/*******************************************************************************
* Copyright (c) 2010, 2013 Sonatype, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Stuart McCulloch (Sonatype, Inc.) - initial API and implementation
*******************************************************************************/
package org.eclipse.sisu.inject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentMap;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.eclipse.sisu.BeanEntry;
import org.eclipse.sisu.Mediator;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
/**
* Default {@link MutableBeanLocator} that locates qualified beans across a dynamic group of {@link BindingPublisher}s.
*/
@Singleton
@SuppressWarnings( { "rawtypes", "unchecked" } )
public final class DefaultBeanLocator
implements MutableBeanLocator
{
// ----------------------------------------------------------------------
// Implementation fields
// ----------------------------------------------------------------------
private final RankedSequence<BindingPublisher> publishers = new RankedSequence<BindingPublisher>();
private final ConcurrentMap<TypeLiteral, RankedBindings> cachedBindings = Soft.concurrentValues( 256, 8 );
// reverse mapping; can't use watcher as key since it may not be unique
private final Map<WatchedBeans, Object> cachedWatchers = Weak.values();
private final ImplicitBindings implicitBindings = new ImplicitBindings( publishers );
// ----------------------------------------------------------------------
// Public methods
// ----------------------------------------------------------------------
public Iterable<BeanEntry> locate( final Key key )
{
final TypeLiteral type = key.getTypeLiteral();
RankedBindings bindings = cachedBindings.get( type );
if ( null == bindings )
{
synchronized ( this )
{
bindings = new RankedBindings( type, publishers );
final RankedBindings oldBindings = cachedBindings.putIfAbsent( type, bindings );
if ( null != oldBindings )
{
bindings = oldBindings;
}
}
}
final boolean isImplicit = key.getAnnotationType() == null && TypeArguments.isImplicit( type );
return new LocatedBeans( key, bindings, isImplicit ? implicitBindings : null );
}
public synchronized void watch( final Key key, final Mediator mediator, final Object watcher )
{
final WatchedBeans beans = new WatchedBeans( key, mediator, watcher );
for ( final BindingPublisher p : publishers.snapshot() )
{
p.subscribe( beans );
}
cachedWatchers.put( beans, watcher );
}
public synchronized void add( final BindingPublisher publisher, final int rank )
{
if ( !publishers.contains( publisher ) )
{
Logs.trace( "Add publisher: {}", publisher, null );
publishers.insert( publisher, rank );
for ( final RankedBindings bindings : cachedBindings.values() )
{
bindings.add( publisher, rank );
}
for ( final WatchedBeans beans : cachedWatchers.keySet() )
{
publisher.subscribe( beans );
}
}
}
public synchronized void remove( final BindingPublisher publisher )
{
if ( publishers.remove( publisher ) )
{
Logs.trace( "Remove publisher: {}", publisher, null );
// igorf: I question the use of Soft.concurrentValues for cachedBindings.
// Seems over-engineered and does not correctly implement Map interface.
// entrySet().iterator().remove() does not modify the map for example
Map<TypeLiteral, RankedBindings> emptyBindings = new HashMap<TypeLiteral, RankedBindings>();
Iterator<Map.Entry<TypeLiteral, RankedBindings>> iter = cachedBindings.entrySet().iterator();
while ( iter.hasNext() )
{
final Entry<TypeLiteral, RankedBindings> entry = iter.next();
final RankedBindings bindings = entry.getValue();
bindings.remove( publisher );
if ( bindings.isEmpty() )
{
// iter.remove(); does nothing :-(
emptyBindings.put( entry.getKey(), entry.getValue() );
}
}
for ( Map.Entry<TypeLiteral, RankedBindings> entry : emptyBindings.entrySet() )
{
cachedBindings.remove( entry.getKey() );
}
for ( final WatchedBeans beans : cachedWatchers.keySet() )
{
publisher.unsubscribe( beans );
}
}
}
public synchronized void clear()
{
for ( final BindingPublisher p : publishers.snapshot() )
{
remove( p );
}
}
public void add( final Injector injector, final int rank )
{
add( new InjectorPublisher( injector, new DefaultRankingFunction( rank ) ), rank );
}
public void remove( final Injector injector )
{
remove( new InjectorPublisher( injector, null ) );
}
// ----------------------------------------------------------------------
// Implementation methods
// ----------------------------------------------------------------------
/**
* Automatically publishes any {@link Injector} that contains a binding to this {@link BeanLocator}.
*
* @param injector The injector
*/
@Inject
void autoPublish( final Injector injector )
{
staticAutoPublish( this, injector );
}
@Inject
static void staticAutoPublish( final MutableBeanLocator locator, final Injector injector )
{
final RankingFunction function = injector.getInstance( RankingFunction.class );
locator.add( new InjectorPublisher( injector, function ), function.maxRank() );
}
}
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