1 /* gnu.java.rmi.server.ConnectionRunnerPool 2 Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.java.rmi.server; 40 41 import java.util.ArrayList; 42 import java.util.Arrays; 43 44 //Should I generalize this class? 45 46 class ConnectionRunnerPool 47 { 48 49 public static 50 class ConnectionRunner extends Thread{ 51 private UnicastConnection conn; 52 private volatile boolean exiting = false; 53 ConnectionRunner(ThreadGroup group, String id)54 public ConnectionRunner(ThreadGroup group, String id){ 55 super(group, id); 56 } 57 run()58 public synchronized void run(){ 59 while(!exiting){ 60 if(conn == null) 61 try{ 62 wait(); 63 }catch(InterruptedException e){ 64 continue; 65 } 66 else{ 67 conn.run(); 68 conn = null; 69 synchronized(ConnectionRunnerPool.class){ 70 freelist.add(this); 71 if(freelist.size() == 1) 72 ConnectionRunnerPool.class.notifyAll(); 73 } 74 } 75 } 76 } 77 dispatch(UnicastConnection conn)78 public synchronized void dispatch(UnicastConnection conn){ 79 this.conn = conn; 80 notify(); 81 } 82 exit()83 void exit(){ 84 exiting = true; 85 if(conn != null) 86 try{ 87 join(500); 88 }catch(InterruptedException e){} 89 interrupt(); 90 } 91 92 } 93 94 // Should this value equal to number of CPU? 95 private static int size = 5; 96 private static int max_size = 10; 97 98 // Package-private to avoid a trampoline. 99 static ArrayList freelist; 100 101 private static ThreadGroup group = new ThreadGroup("pool"); 102 103 static { 104 ConnectionRunner[] pools = new ConnectionRunner[size]; 105 for(int i = 0; i < pools.length; i++){ 106 pools[i] = new ConnectionRunner(group, Integer.toString(i)); 107 pools[i].setContextClassLoader(Thread.currentThread().getContextClassLoader()); start()108 pools[i].start(); 109 } 110 freelist = new ArrayList(Arrays.asList(pools)); 111 } 112 setSize(int size_)113 public static void setSize(int size_){ 114 size = size_; 115 } 116 setMaxSize(int size)117 public static void setMaxSize(int size){ 118 max_size = size; 119 } 120 getConnectionRunner()121 private static synchronized ConnectionRunner getConnectionRunner() 122 { 123 if(freelist.size() == 0){ 124 if(size < max_size){ 125 ++size; 126 ConnectionRunner a = new ConnectionRunner(group, Integer.toString(size)); 127 a.start(); 128 freelist.add(a); 129 }else 130 while(freelist.size() == 0) 131 try{ 132 ConnectionRunnerPool.class.wait(); 133 }catch(InterruptedException e){} 134 } 135 136 // always let the first in pool most busy or other scheduling plan?? 137 ConnectionRunner a = (ConnectionRunner)freelist.get(0); 138 freelist.remove(a); 139 return a; 140 } 141 dispatchConnection(UnicastConnection conn)142 public static void dispatchConnection(UnicastConnection conn) 143 { 144 ConnectionRunner r = getConnectionRunner(); 145 r.dispatch(conn); 146 } 147 exit()148 public static void exit() 149 { 150 Thread[] list = new Thread[group.activeCount()]; 151 group.enumerate(list); 152 for(int i = 0; i < list.length; i++) 153 ((ConnectionRunner)list[i]).exit(); 154 } 155 156 } 157