Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* SelectorProvider.java
+   Copyright (C) 2002, 2003, 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.nio.channels.spi;
+
+import gnu.java.nio.SelectorProviderImpl;
+
+import java.io.IOException;
+import java.nio.channels.DatagramChannel;
+import java.nio.channels.Pipe;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+
+
+/**
+ * @author Michael Koch
+ * @since 1.4
+ */
+public abstract class SelectorProvider
+{
+  private static SelectorProvider systemDefaultProvider;
+
+  /**
+   * Initializes the selector provider.
+   *
+   * @exception SecurityException If a security manager has been installed and
+   * it denies @see RuntimePermission ("selectorProvider").
+   */
+  protected SelectorProvider()
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkPermission(new RuntimePermission("selectorProvider"));
+  }
+
+  /**
+   * Opens a datagram channel.
+   *
+   * @return a new datagram channel object
+   * 
+   * @exception IOException if an error occurs
+   */
+  public abstract DatagramChannel openDatagramChannel()
+    throws IOException;
+
+  /**
+   * Opens a pipe.
+   *
+   * @return a new pipe object
+   * 
+   * @exception IOException if an error occurs
+   */
+  public abstract Pipe openPipe() throws IOException;
+
+  /**
+   * Opens a selector.
+   *
+   * @return a new selector object
+   * 
+   * @exception IOException if an error occurs
+   */
+  public abstract AbstractSelector openSelector() throws IOException;
+
+  /**
+   * Opens a server socket channel.
+   *
+   * @return a new server socket channel object
+   * 
+   * @exception IOException if an error occurs
+   */
+  public abstract ServerSocketChannel openServerSocketChannel()
+    throws IOException;
+
+  /**
+   * Opens a socket channel.
+   *
+   * @return a new socket channel object
+   * 
+   * @exception IOException if an error occurs
+   */
+  public abstract SocketChannel openSocketChannel() throws IOException;
+
+  /**
+   * Returns the system-wide default selector provider for this invocation
+   * of the Java virtual machine.
+   *
+   * @return the default seletor provider
+   */
+  public static synchronized SelectorProvider provider()
+  {
+    if (systemDefaultProvider == null)
+      {
+	String propertyValue =
+	  System.getProperty("java.nio.channels.spi.SelectorProvider");
+
+	if (propertyValue == null || propertyValue.equals(""))
+	  systemDefaultProvider = new SelectorProviderImpl();
+	else
+	  {
+	    try
+	      {
+		systemDefaultProvider =
+		  (SelectorProvider) Class.forName(propertyValue)
+		                          .newInstance();
+	      }
+	    catch (Exception e)
+	      {
+		System.err.println("Could not instantiate class: "
+		                   + propertyValue);
+		systemDefaultProvider = new SelectorProviderImpl();
+	      }
+	  }
+      }
+
+    return systemDefaultProvider;
+  }
+}