RequestHandler.java revision 2593:035b01d356ee 
1/*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package com.sun.tools.sjavac.server;
26
27import java.io.File;
28import java.io.IOException;
29import java.io.ObjectInputStream;
30import java.io.ObjectOutputStream;
31import java.io.PrintWriter;
32import java.io.StringWriter;
33import java.net.Socket;
34import java.net.URI;
35import java.util.List;
36import java.util.Set;
37
38import com.sun.tools.sjavac.Log;
39
40/**
41 * A RequestHandler handles requests performed over a socket. Specifically it
42 *  - Reads the command string specifying which method is to be invoked
43 *  - Reads the appropriate arguments
44 *  - Delegates the actual invocation to the given sjavac implementation
45 *  - Writes the result back to the socket output stream
46 *
47 * None of the work performed by this class is really bound by the CPU. It
48 * should be completely fine to have a large number of RequestHandlers active.
49 * To limit the number of concurrent compilations, use PooledSjavac.
50 *
51 *  <p><b>This is NOT part of any supported API.
52 *  If you write code that depends on this, you do so at your own risk.
53 *  This code and its internal interfaces are subject to change or
54 *  deletion without notice.</b>
55 */
56public class RequestHandler implements Runnable {
57
58    private final Socket socket;
59    private final Sjavac sjavac;
60
61    public RequestHandler(Socket socket, Sjavac sjavac) {
62        this.socket = socket;
63        this.sjavac = sjavac;
64    }
65
66    @Override
67    public void run() {
68        try (ObjectOutputStream oout = new ObjectOutputStream(socket.getOutputStream());
69             ObjectInputStream oin = new ObjectInputStream(socket.getInputStream())) {
70            String id = (String) oin.readObject();
71            String cmd = (String) oin.readObject();
72            Log.info("Handling request, id: " + id + " cmd: " + cmd);
73            switch (cmd) {
74            case SjavacServer.CMD_SYS_INFO: handleSysInfoRequest(oin, oout); break;
75            case SjavacServer.CMD_COMPILE:  handleCompileRequest(oin, oout); break;
76            default: Log.error("Unknown command: " + cmd);
77            }
78        } catch (Exception ex) {
79            // Not much to be done at this point. The client side request
80            // code will most likely throw an IOException and the
81            // compilation will fail.
82            StringWriter sw = new StringWriter();
83            ex.printStackTrace(new PrintWriter(sw));
84            Log.error(sw.toString());
85        }
86    }
87
88    private void handleSysInfoRequest(ObjectInputStream oin,
89                                      ObjectOutputStream oout) throws IOException {
90        oout.writeObject(sjavac.getSysInfo());
91        oout.flush();
92    }
93
94    @SuppressWarnings("unchecked")
95    private void handleCompileRequest(ObjectInputStream oin,
96                                      ObjectOutputStream oout) throws IOException {
97        try {
98            // Read request arguments
99            String protocolId = (String) oin.readObject();
100            String invocationId = (String) oin.readObject();
101            String[] args = (String[]) oin.readObject();
102            List<File> explicitSources = (List<File>) oin.readObject();
103            Set<URI> sourcesToCompile = (Set<URI>) oin.readObject();
104            Set<URI> visibleSources = (Set<URI>) oin.readObject();
105
106            // Perform compilation
107            CompilationResult cr = sjavac.compile(protocolId,
108                                                  invocationId,
109                                                  args,
110                                                  explicitSources,
111                                                  sourcesToCompile,
112                                                  visibleSources);
113            // Write request response
114            oout.writeObject(cr);
115            oout.flush();
116        } catch (ClassNotFoundException cnfe) {
117            throw new IOException(cnfe);
118        }
119    }
120}
121