Showing the changes to java/pkg/sun/net/ResourceManager.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,82 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 2011, 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 | */ | ||
| 25 | |||
| 26 | package sun.net; | ||
| 27 | |||
| 28 | import java.net.SocketException; | ||
| 29 | import java.util.concurrent.atomic.AtomicInteger; | ||
| 30 | import sun.security.action.GetPropertyAction; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * Manages count of total number of UDP sockets and ensures | ||
| 34 | * that exception is thrown if we try to create more than the | ||
| 35 | * configured limit. | ||
| 36 | * | ||
| 37 | * This functionality could be put in NetHooks some time in future. | ||
| 38 | */ | ||
| 39 | |||
| 40 | public class ResourceManager { | ||
| 41 | |||
| 42 | /* default maximum number of udp sockets per VM | ||
| 43 | * when a security manager is enabled. | ||
| 44 | * The default is 1024 which is high enough to be useful | ||
| 45 | * but low enough to be well below the maximum number | ||
| 46 | * of port numbers actually available on all OSes for | ||
| 47 | * such sockets (5000 on some versions of windows) | ||
| 48 | */ | ||
| 49 | |||
| 50 | private static final int DEFAULT_MAX_SOCKETS = 1024; | ||
| 51 | private static final int maxSockets; | ||
| 52 | private static final AtomicInteger numSockets; | ||
| 53 | |||
| 54 | static { | ||
| 55 | String prop = java.security.AccessController.doPrivileged( | ||
| 56 | new GetPropertyAction("sun.net.maxDatagramSockets") | ||
| 57 | ); | ||
| 58 | int defmax = DEFAULT_MAX_SOCKETS; | ||
| 59 | try { | ||
| 60 | if (prop != null) { | ||
| 61 | defmax = Integer.parseInt(prop); | ||
| 62 | } | ||
| 63 | } catch (NumberFormatException e) {} | ||
| 64 | maxSockets = defmax; | ||
| 65 | numSockets = new AtomicInteger(0); | ||
| 66 | } | ||
| 67 | |||
| 68 | public static void beforeUdpCreate() throws SocketException { | ||
| 69 | if (System.getSecurityManager() != null) { | ||
| 70 | if (numSockets.incrementAndGet() > maxSockets) { | ||
| 71 | numSockets.decrementAndGet(); | ||
| 72 | throw new SocketException("maximum number of DatagramSockets reached"); | ||
| 73 | } | ||
| 74 | } | ||
| 75 | } | ||
| 76 | |||
| 77 | public static void afterUdpClose() { | ||
| 78 | if (System.getSecurityManager() != null) { | ||
| 79 | numSockets.decrementAndGet(); | ||
| 80 | } | ||
| 81 | } | ||
| 82 | } | ||