1 /*
   2  * Copyright (c) 2015, 2019, 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.nio.ch;
  27 
  28 import java.security.AccessController;
  29 import java.security.PrivilegedAction;
  30 
  31 /**
  32  * Creates this platform's default SelectorProvider
  33  */
  34 
  35 public class DefaultSelectorProvider {
  36     private static final SelectorProviderImpl INSTANCE;
  37     static {
  38         PrivilegedAction<SelectorProviderImpl> pa = DevPollSelectorProvider::new;
  39         INSTANCE = AccessController.doPrivileged(pa);
  40     }
  41 
  42     /**
  43      * Prevent instantiation.
  44      */
  45     private DefaultSelectorProvider() { }
  46 
  47     /**
  48      * Returns the default SelectorProvider implementation.
  49      */
  50     public static SelectorProviderImpl get() {
  51         return INSTANCE;
  52     }
  53 }