1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.ahat;
18 
19 import com.android.ahat.heapdump.AhatInstance;
20 import com.android.ahat.heapdump.AhatSnapshot;
21 import com.sun.net.httpserver.HttpExchange;
22 import com.sun.net.httpserver.HttpHandler;
23 import java.awt.image.BufferedImage;
24 import java.io.IOException;
25 import java.io.OutputStream;
26 import java.io.PrintStream;
27 import javax.imageio.ImageIO;
28 
29 class BitmapHandler implements HttpHandler {
30   private AhatSnapshot mSnapshot;
31 
BitmapHandler(AhatSnapshot snapshot)32   public BitmapHandler(AhatSnapshot snapshot) {
33     mSnapshot = snapshot;
34   }
35 
36   @Override
handle(HttpExchange exchange)37   public void handle(HttpExchange exchange) throws IOException {
38     try {
39       Query query = new Query(exchange.getRequestURI());
40       long id = query.getLong("id", 0);
41       BufferedImage bitmap = null;
42       AhatInstance inst = mSnapshot.findInstance(id);
43       if (inst != null) {
44         bitmap = inst.asBitmap();
45       }
46 
47       if (bitmap != null) {
48         exchange.getResponseHeaders().add("Content-Type", "image/png");
49         exchange.sendResponseHeaders(200, 0);
50         OutputStream os = exchange.getResponseBody();
51         ImageIO.write(bitmap, "png", os);
52         os.close();
53       } else {
54         exchange.getResponseHeaders().add("Content-Type", "text/html");
55         exchange.sendResponseHeaders(404, 0);
56         PrintStream ps = new PrintStream(exchange.getResponseBody());
57         HtmlDoc doc = new HtmlDoc(ps, DocString.text("ahat"), DocString.uri("style.css"));
58         doc.big(DocString.text("No bitmap found for the given request."));
59         doc.close();
60       }
61     } catch (RuntimeException e) {
62       // Print runtime exceptions to standard error for debugging purposes,
63       // because otherwise they are swallowed and not reported.
64       System.err.println("Exception when handling " + exchange.getRequestURI() + ": ");
65       e.printStackTrace();
66       throw e;
67     }
68   }
69 }
70