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/*
* Copyright (c) 2007, 2008, 2010-2012, 2017 Eike Stepper (Berlin, Germany) and others.
* 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.internal.net4j.buffer;
import org.eclipse.net4j.buffer.IBuffer;
import org.eclipse.net4j.buffer.IBufferProvider;
import org.eclipse.net4j.util.event.Event;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.event.Notifier;
/**
* @author Eike Stepper
*/
public abstract class BufferProvider extends Notifier implements IBufferProvider.Introspection, IBufferProvider.Notification
{
private short bufferCapacity;
private long providedBuffers;
private long retainedBuffers;
public BufferProvider(short bufferCapacity)
{
this.bufferCapacity = bufferCapacity;
}
public final long getProvidedBuffers()
{
return providedBuffers;
}
public final long getRetainedBuffers()
{
return retainedBuffers;
}
public final short getBufferCapacity()
{
return bufferCapacity;
}
public final IBuffer provideBuffer()
{
IBuffer buffer = doProvideBuffer();
++providedBuffers;
IListener[] listeners = getListeners();
if (listeners != null)
{
fireEvent(new BufferProviderEvent.Provided(this, buffer), listeners);
}
return buffer;
}
public final void retainBuffer(IBuffer buffer)
{
IListener[] listeners = getListeners();
if (listeners != null)
{
fireEvent(new BufferProviderEvent.Retaining(this, buffer), listeners);
}
doRetainBuffer(buffer);
++retainedBuffers;
}
@Override
public String toString()
{
return "BufferProvider[capacity=" + bufferCapacity + "]"; //$NON-NLS-1$ //$NON-NLS-2$
}
protected abstract IBuffer doProvideBuffer();
protected abstract void doRetainBuffer(IBuffer buffer);
/**
* @author Eike Stepper
*/
protected static abstract class BufferProviderEvent extends Event
{
private static final long serialVersionUID = 1L;
private final IBuffer buffer;
public BufferProviderEvent(IBufferProvider.Notification bufferProvider, IBuffer buffer)
{
super(bufferProvider);
this.buffer = buffer;
}
@Override
public IBufferProvider.Notification getSource()
{
return (IBufferProvider.Notification)super.getSource();
}
public IBuffer getBuffer()
{
return buffer;
}
@Override
protected String formatAdditionalParameters()
{
return "buffer=" + buffer;
}
/**
* @author Eike Stepper
*/
private static final class Provided extends BufferProviderEvent implements BufferProvidedEvent
{
private static final long serialVersionUID = 1L;
public Provided(IBufferProvider.Notification bufferProvider, IBuffer buffer)
{
super(bufferProvider, buffer);
}
@Override
protected String formatEventName()
{
return "BufferProvidedEvent";
}
}
/**
* @author Eike Stepper
*/
private static final class Retaining extends BufferProviderEvent implements BufferRetainingEvent
{
private static final long serialVersionUID = 1L;
public Retaining(IBufferProvider.Notification bufferProvider, IBuffer buffer)
{
super(bufferProvider, buffer);
}
@Override
protected String formatEventName()
{
return "BufferRetainingEvent";
}
}
}
}
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