io.netty.example.http2.tiles.ImageCache Maven / Gradle / Ivy
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.http2.tiles;
import static io.netty.buffer.Unpooled.unreleasableBuffer;
import static io.netty.example.http2.Http2ExampleUtil.toByteBuf;
import io.netty.buffer.ByteBuf;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Caches the images to avoid reading them every time from the disk.
*/
public final class ImageCache {
public static ImageCache INSTANCE = new ImageCache();
private final Map imageBank = new HashMap(200);
private ImageCache() {
init();
}
public static String name(int x, int y) {
return "tile-" + y + "-" + x + ".jpeg";
}
public ByteBuf image(int x, int y) {
return imageBank.get(name(x, y));
}
private void init() {
for (int y = 0; y < 10; y++) {
for (int x = 0; x < 20; x++) {
try {
String name = name(x, y);
ByteBuf fileBytes = unreleasableBuffer(toByteBuf(getClass()
.getResourceAsStream(name)).asReadOnly());
imageBank.put(name, fileBytes);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}