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/*
* Copyright 2007 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Sun Microsystems nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package net.java.joglutils.msg.test;
import java.awt.EventQueue;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.*;
import javax.imageio.*;
/**
* Basic implementation of Fetcher using ImageIO and a single-threaded
* ExecutorService.
*
* @author Kenneth Russell
*/
public class BasicFetcher<IDENT> implements Fetcher<IDENT> {
private volatile ArrayList<ProgressListener> listeners = new ArrayList<ProgressListener>();
private Map<FetchKey, Future<BufferedImage>> activeTasks = new HashMap<FetchKey, Future<BufferedImage>>();
private ExecutorService threadPool;
public BasicFetcher() {
threadPool = Executors.newSingleThreadExecutor(new ThreadFactory() {
public Thread newThread(Runnable r) {
Thread t = Executors.defaultThreadFactory().newThread(r);
t.setPriority(Thread.NORM_PRIORITY - 2);
return t;
}
});
}
public synchronized BufferedImage getImage(final Object imageDescriptor,
final IDENT clientIdentifier,
final int requestedImageSize) {
FetchKey key = new FetchKey(imageDescriptor, clientIdentifier, requestedImageSize);
Future<BufferedImage> result = activeTasks.get(key);
if (result != null) {
try {
return result.get(1, TimeUnit.MILLISECONDS);
} catch (Exception e) {
return null;
}
}
FutureTask<BufferedImage> task = new FutureTask<BufferedImage>(new Callable<BufferedImage>() {
public BufferedImage call() {
try {
if (imageDescriptor instanceof File) {
return ImageIO.read((File) imageDescriptor);
} else if (imageDescriptor instanceof URL) {
return ImageIO.read((URL) imageDescriptor);
} else {
throw new RuntimeException("Unsupported ImageDescriptorType " + imageDescriptor.getClass().getName());
}
} catch (Exception e) {
System.out.println("Exception loading " + imageDescriptor + ":");
e.printStackTrace();
return null;
} finally {
fireProgressEnd(new ProgressEvent(BasicFetcher.this,
imageDescriptor,
clientIdentifier,
1.0f,
true));
}
}
});
activeTasks.put(key, task);
threadPool.execute(task);
return null;
}
public void cancelDownload(Object imageDescriptor,
IDENT clientIdentifier,
int requestedImageSize) {
}
public synchronized void addProgressListener(ProgressListener listener) {
ArrayList<ProgressListener> newListeners = (ArrayList<ProgressListener>) listeners.clone();
newListeners.add(listener);
listeners = newListeners;
}
public synchronized void removeProgressListener(ProgressListener listener) {
ArrayList<ProgressListener> newListeners = (ArrayList<ProgressListener>) listeners.clone();
newListeners.remove(listener);
listeners = newListeners;
}
//----------------------------------------------------------------------
// Internals only below this point
//
class FetchKey {
private Object imageDescriptor;
private IDENT clientIdentifier;
private int requestedImageSize;
public FetchKey(Object imageDescriptor,
IDENT clientIdentifier,
int requestedImageSize) {
this.imageDescriptor = imageDescriptor;
this.clientIdentifier = clientIdentifier;
this.requestedImageSize = requestedImageSize;
}
public Object getImageDescriptor () { return imageDescriptor; }
public IDENT getClientIdentifier () { return clientIdentifier; }
public int getRequestedImageSize() { return requestedImageSize; }
public boolean equals(Object o) {
if (this == o) return true;
if (o == null) return false;
if (getClass() != o.getClass()) return false;
FetchKey other = (FetchKey) o;
return (requestedImageSize == other.requestedImageSize &&
imageDescriptor.equals(other.imageDescriptor) &&
clientIdentifier.equals(other.clientIdentifier));
}
public int hashCode() {
int result;
result = clientIdentifier.hashCode();
result = 29 * result + imageDescriptor.hashCode();
result = 29 * result + requestedImageSize;
return result;
}
}
private synchronized void fireProgressStart(final ProgressEvent e) {
List<ProgressListener> curListeners = listeners;
for (ProgressListener listener : curListeners) {
final ProgressListener finalListener = listener;
invokeLaterOnEDT(new Runnable() {
public void run() {
finalListener.progressStart(e);
}
});
}
}
private synchronized void fireProgressUpdate(final ProgressEvent e) {
List<ProgressListener> curListeners = listeners;
for (ProgressListener listener : curListeners) {
final ProgressListener finalListener = listener;
invokeLaterOnEDT(new Runnable() {
public void run() {
finalListener.progressUpdate(e);
}
});
}
}
private synchronized void fireProgressEnd(final ProgressEvent e) {
List<ProgressListener> curListeners = listeners;
for (ProgressListener listener : curListeners) {
final ProgressListener finalListener = listener;
invokeLaterOnEDT(new Runnable() {
public void run() {
finalListener.progressEnd(e);
}
});
}
}
private void invokeLaterOnEDT(Runnable runnable) {
if (EventQueue.isDispatchThread()) {
runnable.run();
} else {
EventQueue.invokeLater(runnable);
}
}
}
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