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/*
* Copyright © 2010 Anthony Towns <aj@erisian.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package org.altusmetrum.altosuilib_3;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.awt.image.*;
import java.awt.*;
import java.io.*;
import java.net.*;
public class AltosUIMapCache implements AltosUIMapCacheListener {
static final int success = 0;
static final int loading = 1;
static final int failed = 2;
static final int bad_request = 3;
static final int forbidden = 4;
int min_cache_size; /* configured minimum cache size */
int cache_size; /* current cache size */
int requested_cache_size; /* cache size computed by application */
private Object fetch_lock = new Object();
private Object cache_lock = new Object();
AltosUIMapImage[] images = new AltosUIMapImage[cache_size];
long used;
public void set_cache_size(int new_size) {
requested_cache_size = new_size;
if (new_size < min_cache_size)
new_size = min_cache_size;
if (new_size == cache_size)
return;
synchronized(cache_lock) {
AltosUIMapImage[] new_images = new AltosUIMapImage[new_size];
for (int i = 0; i < cache_size; i++) {
if (i < new_size)
new_images[i] = images[i];
else if (images[i] != null)
images[i].flush();
}
images = new_images;
cache_size = new_size;
}
}
public Image get(AltosUIMapTile tile, AltosUIMapStore store, int width, int height) {
int oldest = -1;
long age = used;
synchronized(cache_lock) {
AltosUIMapImage image = null;
for (int i = 0; i < cache_size; i++) {
image = images[i];
if (image == null) {
oldest = i;
break;
}
if (store.equals(image.store)) {
image.used = used++;
return image.image;
}
if (image.used < age) {
oldest = i;
age = image.used;
}
}
try {
image = new AltosUIMapImage(tile, store);
image.used = used++;
if (images[oldest] != null)
images[oldest].flush();
images[oldest] = image;
if (image.image == null)
tile.set_status(loading);
else
tile.set_status(success);
return image.image;
} catch (IOException e) {
tile.set_status(failed);
return null;
}
}
}
public void map_cache_changed(int map_cache) {
min_cache_size = map_cache;
set_cache_size(requested_cache_size);
}
public void dispose() {
AltosUIPreferences.unregister_map_cache_listener(this);
for (int i = 0; i < cache_size; i++) {
AltosUIMapImage image = images[i];
if (image != null)
image.flush();
}
}
public AltosUIMapCache() {
min_cache_size = AltosUIPreferences.map_cache();
set_cache_size(0);
AltosUIPreferences.register_map_cache_listener(this);
}
}
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