src/jdk.compiler/share/classes/com/sun/tools/sjavac/server/SjavacServer.java - platform/libcore - Gitiles

 /*
  * Copyright (c) 2011, 2016, 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 java.io.FileNotFoundException;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.PrintStream;
 import java.io.PrintWriter;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.SocketException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Random;
 import java.util.concurrent.atomic.AtomicBoolean;

 import com.sun.tools.javac.main.Main;
 import com.sun.tools.javac.main.Main.Result;
 import com.sun.tools.sjavac.Log;
 import com.sun.tools.sjavac.Util;
 import com.sun.tools.sjavac.client.PortFileInaccessibleException;
 import com.sun.tools.sjavac.comp.PooledSjavac;
 import com.sun.tools.sjavac.comp.SjavacImpl;

 /**
  * The JavacServer class contains methods both to setup a server that responds to requests and methods to connect to this server.
  *
  *  <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 SjavacServer implements Terminable {

     // Prefix of line containing return code.
     public final static String LINE_TYPE_RC = "RC";

     final private String portfilename;
     final private int poolsize;
     final private int keepalive;

     // The secret cookie shared between server and client through the port file.
     // Used to prevent clients from believing that they are communicating with
     // an old server when a new server has started and reused the same port as
     // an old server.
     private final long myCookie;

     // Accumulated build time, not counting idle time, used for logging purposes
     private long totalBuildTime;

     // The sjavac implementation to delegate requests to
     Sjavac sjavac;

     private ServerSocket serverSocket;

     private PortFile portFile;
     private PortFileMonitor portFileMonitor;

     // Set to false break accept loop
     final AtomicBoolean keepAcceptingRequests = new AtomicBoolean();

     // For the client, all port files fetched, one per started javac server.
     // Though usually only one javac server is started by a client.
     private static Map<String, PortFile> allPortFiles;

     public SjavacServer(String settings) throws FileNotFoundException {
         this(Util.extractStringOption("portfile", settings),
              Util.extractIntOption("poolsize", settings, Runtime.getRuntime().availableProcessors()),
              Util.extractIntOption("keepalive", settings, 120));
     }

     public SjavacServer(String portfilename,
                         int poolsize,
                         int keepalive)
                                 throws FileNotFoundException {
         this.portfilename = portfilename;
         this.poolsize = poolsize;
         this.keepalive = keepalive;
         this.myCookie = new Random().nextLong();
     }


     /**
      * Acquire the port file. Synchronized since several threads inside an smart javac wrapper client acquires the same port file at the same time.
      */
     public static synchronized PortFile getPortFile(String filename) {
         if (allPortFiles == null) {
             allPortFiles = new HashMap<>();
         }
         PortFile pf = allPortFiles.get(filename);

         // Port file known. Does it still exist?
         if (pf != null) {
             try {
                 if (!pf.exists())
                     pf = null;
             } catch (IOException ioex) {
                 ioex.printStackTrace();
             }
         }

         if (pf == null) {
             pf = new PortFile(filename);
             allPortFiles.put(filename, pf);
         }
         return pf;
     }

     /**
      * Get the cookie used for this server.
      */
     long getCookie() {
         return myCookie;
     }

     /**
      * Get the port used for this server.
      */
     int getPort() {
         return serverSocket.getLocalPort();
     }

     /**
      * Sum up the total build time for this javac server.
      */
     public void addBuildTime(long inc) {
         totalBuildTime += inc;
     }

     /**
      * Start a server using a settings string. Typically: "--startserver:portfile=/tmp/myserver,poolsize=3" and the string "portfile=/tmp/myserver,poolsize=3"
      * is sent as the settings parameter. Returns 0 on success, -1 on failure.
      */
     public int startServer() throws IOException, InterruptedException {
         long serverStart = System.currentTimeMillis();

         // The port file is locked and the server port and cookie is written into it.
         portFile = getPortFile(portfilename);

         synchronized (portFile) {
             portFile.lock();
             portFile.getValues();
             if (portFile.containsPortInfo()) {
                 Log.debug("Javac server not started because portfile exists!");
                 portFile.unlock();
                 return Result.ERROR.exitCode;
             }

             //           .-----------.   .--------.   .------.
             // socket -->| IdleReset |-->| Pooled |-->| Impl |--> javac
             //           '-----------'   '--------'   '------'
             sjavac = new SjavacImpl();
             sjavac = new PooledSjavac(sjavac, poolsize);
             sjavac = new IdleResetSjavac(sjavac,
                                          this,
                                          keepalive * 1000);

             serverSocket = new ServerSocket();
             InetAddress localhost = InetAddress.getByName(null);
             serverSocket.bind(new InetSocketAddress(localhost, 0));

             // At this point the server accepts connections, so it is  now safe
             // to publish the port / cookie information
             portFile.setValues(getPort(), getCookie());
             portFile.unlock();
         }

         portFileMonitor = new PortFileMonitor(portFile, this);
         portFileMonitor.start();

         Log.debug("Sjavac server started. Accepting connections...");
         Log.debug("    port: " + getPort());
         Log.debug("    time: " + new java.util.Date());
         Log.debug("    poolsize: " + poolsize);


         keepAcceptingRequests.set(true);
         do {
             try {
                 Socket socket = serverSocket.accept();
                 new RequestHandler(socket, sjavac).start();
             } catch (SocketException se) {
                 // Caused by serverSocket.close() and indicates shutdown
             }
         } while (keepAcceptingRequests.get());

         Log.debug("Shutting down.");

         // No more connections accepted. If any client managed to connect after
         // the accept() was interrupted but before the server socket is closed
         // here, any attempt to read or write to the socket will result in an
         // IOException on the client side.

         long realTime = System.currentTimeMillis() - serverStart;
         Log.debug("Total wall clock time " + realTime + "ms build time " + totalBuildTime + "ms");

         // Shut down
         sjavac.shutdown();

         return Result.OK.exitCode;
     }

     @Override
     public void shutdown(String quitMsg) {
         if (!keepAcceptingRequests.compareAndSet(true, false)) {
             // Already stopped, no need to shut down again
             return;
         }

         Log.debug("Quitting: " + quitMsg);

         portFileMonitor.shutdown(); // No longer any need to monitor port file

         // Unpublish port before shutting down socket to minimize the number of
         // failed connection attempts
         try {
             portFile.delete();
         } catch (IOException | InterruptedException e) {
             Log.error(e);
         }
         try {
             serverSocket.close();
         } catch (IOException e) {
             Log.error(e);
         }
     }
 }
	/*
	* Copyright (c) 2011, 2016, 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 java.io.FileNotFoundException;
	import java.io.FileWriter;
	import java.io.IOException;
	import java.io.PrintStream;
	import java.io.PrintWriter;
	import java.net.InetAddress;
	import java.net.InetSocketAddress;
	import java.net.ServerSocket;
	import java.net.Socket;
	import java.net.SocketException;
	import java.util.HashMap;
	import java.util.Map;
	import java.util.Random;
	import java.util.concurrent.atomic.AtomicBoolean;

	import com.sun.tools.javac.main.Main;
	import com.sun.tools.javac.main.Main.Result;
	import com.sun.tools.sjavac.Log;
	import com.sun.tools.sjavac.Util;
	import com.sun.tools.sjavac.client.PortFileInaccessibleException;
	import com.sun.tools.sjavac.comp.PooledSjavac;
	import com.sun.tools.sjavac.comp.SjavacImpl;

	/**
	* The JavacServer class contains methods both to setup a server that responds to requests and methods to connect to this server.
	*
	* <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 SjavacServer implements Terminable {

	// Prefix of line containing return code.
	public final static String LINE_TYPE_RC = "RC";

	final private String portfilename;
	final private int poolsize;
	final private int keepalive;

	// The secret cookie shared between server and client through the port file.
	// Used to prevent clients from believing that they are communicating with
	// an old server when a new server has started and reused the same port as
	// an old server.
	private final long myCookie;

	// Accumulated build time, not counting idle time, used for logging purposes
	private long totalBuildTime;

	// The sjavac implementation to delegate requests to
	Sjavac sjavac;

	private ServerSocket serverSocket;

	private PortFile portFile;
	private PortFileMonitor portFileMonitor;

	// Set to false break accept loop
	final AtomicBoolean keepAcceptingRequests = new AtomicBoolean();

	// For the client, all port files fetched, one per started javac server.
	// Though usually only one javac server is started by a client.
	private static Map<String, PortFile> allPortFiles;

	public SjavacServer(String settings) throws FileNotFoundException {
	this(Util.extractStringOption("portfile", settings),
	Util.extractIntOption("poolsize", settings, Runtime.getRuntime().availableProcessors()),
	Util.extractIntOption("keepalive", settings, 120));
	}

	public SjavacServer(String portfilename,
	int poolsize,
	int keepalive)
	throws FileNotFoundException {
	this.portfilename = portfilename;
	this.poolsize = poolsize;
	this.keepalive = keepalive;
	this.myCookie = new Random().nextLong();
	}


	/**
	* Acquire the port file. Synchronized since several threads inside an smart javac wrapper client acquires the same port file at the same time.
	*/
	public static synchronized PortFile getPortFile(String filename) {
	if (allPortFiles == null) {
	allPortFiles = new HashMap<>();
	}
	PortFile pf = allPortFiles.get(filename);

	// Port file known. Does it still exist?
	if (pf != null) {
	try {
	if (!pf.exists())
	pf = null;
	} catch (IOException ioex) {
	ioex.printStackTrace();
	}
	}

	if (pf == null) {
	pf = new PortFile(filename);
	allPortFiles.put(filename, pf);
	}
	return pf;
	}

	/**
	* Get the cookie used for this server.
	*/
	long getCookie() {
	return myCookie;
	}

	/**
	* Get the port used for this server.
	*/
	int getPort() {
	return serverSocket.getLocalPort();
	}

	/**
	* Sum up the total build time for this javac server.
	*/
	public void addBuildTime(long inc) {
	totalBuildTime += inc;
	}

	/**
	* Start a server using a settings string. Typically: "--startserver:portfile=/tmp/myserver,poolsize=3" and the string "portfile=/tmp/myserver,poolsize=3"
	* is sent as the settings parameter. Returns 0 on success, -1 on failure.
	*/
	public int startServer() throws IOException, InterruptedException {
	long serverStart = System.currentTimeMillis();

	// The port file is locked and the server port and cookie is written into it.
	portFile = getPortFile(portfilename);

	synchronized (portFile) {
	portFile.lock();
	portFile.getValues();
	if (portFile.containsPortInfo()) {
	Log.debug("Javac server not started because portfile exists!");
	portFile.unlock();
	return Result.ERROR.exitCode;
	}

	// .-----------. .--------. .------.
	// socket -->\| IdleReset \|-->\| Pooled \|-->\| Impl \|--> javac
	// '-----------' '--------' '------'
	sjavac = new SjavacImpl();
	sjavac = new PooledSjavac(sjavac, poolsize);
	sjavac = new IdleResetSjavac(sjavac,
	this,
	keepalive * 1000);

	serverSocket = new ServerSocket();
	InetAddress localhost = InetAddress.getByName(null);
	serverSocket.bind(new InetSocketAddress(localhost, 0));

	// At this point the server accepts connections, so it is now safe
	// to publish the port / cookie information
	portFile.setValues(getPort(), getCookie());
	portFile.unlock();
	}

	portFileMonitor = new PortFileMonitor(portFile, this);
	portFileMonitor.start();

	Log.debug("Sjavac server started. Accepting connections...");
	Log.debug(" port: " + getPort());
	Log.debug(" time: " + new java.util.Date());
	Log.debug(" poolsize: " + poolsize);


	keepAcceptingRequests.set(true);
	do {
	try {
	Socket socket = serverSocket.accept();
	new RequestHandler(socket, sjavac).start();
	} catch (SocketException se) {
	// Caused by serverSocket.close() and indicates shutdown
	}
	} while (keepAcceptingRequests.get());

	Log.debug("Shutting down.");

	// No more connections accepted. If any client managed to connect after
	// the accept() was interrupted but before the server socket is closed
	// here, any attempt to read or write to the socket will result in an
	// IOException on the client side.

	long realTime = System.currentTimeMillis() - serverStart;
	Log.debug("Total wall clock time " + realTime + "ms build time " + totalBuildTime + "ms");

	// Shut down
	sjavac.shutdown();

	return Result.OK.exitCode;
	}

	@Override
	public void shutdown(String quitMsg) {
	if (!keepAcceptingRequests.compareAndSet(true, false)) {
	// Already stopped, no need to shut down again
	return;
	}

	Log.debug("Quitting: " + quitMsg);

	portFileMonitor.shutdown(); // No longer any need to monitor port file

	// Unpublish port before shutting down socket to minimize the number of
	// failed connection attempts
	try {
	portFile.delete();
	} catch (IOException \| InterruptedException e) {
	Log.error(e);
	}
	try {
	serverSocket.close();
	} catch (IOException e) {
	Log.error(e);
	}
	}
	}