/*

 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.sjavac.server;

import static com.sun.tools.sjavac.server.SjavacServer.LINE_TYPE_RC;

import static com.sun.tools.sjavac.server.SjavacServer.LINE_TYPE_STDERR;

import static com.sun.tools.sjavac.server.SjavacServer.LINE_TYPE_STDOUT;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.io.Writer;

import java.net.Socket;

import com.sun.tools.sjavac.AutoFlushWriter;

import com.sun.tools.sjavac.Log;

/**

 * A RequestHandler handles requests performed over a socket. Specifically it

 *  - Reads the command string specifying which method is to be invoked

 *  - Reads the appropriate arguments

 *  - Delegates the actual invocation to the given sjavac implementation

 *  - Writes the result back to the socket output stream

 *

 * None of the work performed by this class is really bound by the CPU. It

 * should be completely fine to have a large number of RequestHandlers active.

 * To limit the number of concurrent compilations, use PooledSjavac.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class RequestHandler implements Runnable {

    private final Socket socket;

    private final Sjavac sjavac;

    public RequestHandler(Socket socket, Sjavac sjavac) {

        this.socket = socket;

        this.sjavac = sjavac;

    }

    @Override

    public void run() {

        try (BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

             PrintWriter out = new PrintWriter(socket.getOutputStream(), true)) {

            // Read argument array

            int n = Integer.parseInt(in.readLine());

            String[] args = new String[n];

            for (int i = 0; i < n; i++) {

                args[i] = in.readLine();

            }

            // Perform compilation

            Writer stdout = new LinePrefixFilterWriter(new AutoFlushWriter(out), LINE_TYPE_STDOUT + ":");

            Writer stderr = new LinePrefixFilterWriter(new AutoFlushWriter(out), LINE_TYPE_STDERR + ":");

            int rc = sjavac.compile(args, stdout, stderr);

            stdout.flush();

            stderr.flush();

            // Send return code back to client

            out.println(LINE_TYPE_RC + ":" + rc);

        } catch (Exception ex) {

            // Not much to be done at this point. The client side request

            // code will most likely throw an IOException and the

            // compilation will fail.

            StringWriter sw = new StringWriter();

            ex.printStackTrace(new PrintWriter(sw));

            Log.error(sw.toString());

        }

    }

}