author | alanb |
Thu, 15 Mar 2018 10:47:58 +0000 | |
changeset 49248 | 15a0e60c8b97 |
parent 47216 | 71c04702a3d5 |
child 49417 | 1d3139252c1c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.ch; |
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import java.io.IOException; |
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import java.nio.channels.*; |
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import java.nio.channels.spi.*; |
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import java.util.Map; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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/** |
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* Selector implementation based on the Solaris event port mechanism. |
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*/ |
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class EventPortSelectorImpl |
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extends SelectorImpl |
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{ |
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private final EventPortWrapper pollWrapper; |
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// Maps from file descriptors to keys |
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private final Map<Integer, SelectionKeyImpl> fdToKey; |
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// True if this Selector has been closed |
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private boolean closed; |
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// Lock for interrupt triggering and clearing |
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private final Object interruptLock = new Object(); |
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private boolean interruptTriggered; |
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/** |
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* Package private constructor called by factory method in |
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* the abstract superclass Selector. |
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*/ |
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EventPortSelectorImpl(SelectorProvider sp) throws IOException { |
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super(sp); |
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pollWrapper = new EventPortWrapper(); |
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fdToKey = new HashMap<>(); |
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} |
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private void ensureOpen() { |
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if (closed) |
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throw new ClosedSelectorException(); |
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} |
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@Override |
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protected int doSelect(long timeout) throws IOException { |
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ensureOpen(); |
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processDeregisterQueue(); |
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int entries; |
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try { |
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begin(); |
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entries = pollWrapper.poll(timeout); |
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} finally { |
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end(); |
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} |
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processDeregisterQueue(); |
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int numKeysUpdated = updateSelectedKeys(entries); |
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if (pollWrapper.interrupted()) { |
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synchronized (interruptLock) { |
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interruptTriggered = false; |
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} |
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} |
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return numKeysUpdated; |
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} |
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private int updateSelectedKeys(int entries) { |
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int numKeysUpdated = 0; |
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for (int i=0; i<entries; i++) { |
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int nextFD = pollWrapper.getDescriptor(i); |
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SelectionKeyImpl ski = fdToKey.get(Integer.valueOf(nextFD)); |
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if (ski != null) { |
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int rOps = pollWrapper.getEventOps(i); |
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if (selectedKeys.contains(ski)) { |
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if (ski.channel.translateAndSetReadyOps(rOps, ski)) { |
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numKeysUpdated++; |
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} |
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} else { |
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ski.channel.translateAndSetReadyOps(rOps, ski); |
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if ((ski.nioReadyOps() & ski.nioInterestOps()) != 0) { |
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selectedKeys.add(ski); |
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numKeysUpdated++; |
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} |
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} |
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} |
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} |
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return numKeysUpdated; |
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} |
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@Override |
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protected void implClose() throws IOException { |
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if (closed) |
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return; |
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closed = true; |
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// prevent further wakeup |
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synchronized (interruptLock) { |
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interruptTriggered = true; |
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} |
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pollWrapper.close(); |
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// Deregister channels |
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Iterator<SelectionKey> i = keys.iterator(); |
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while (i.hasNext()) { |
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SelectionKeyImpl ski = (SelectionKeyImpl)i.next(); |
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deregister(ski); |
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SelectableChannel selch = ski.channel(); |
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if (!selch.isOpen() && !selch.isRegistered()) |
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((SelChImpl)selch).kill(); |
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i.remove(); |
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} |
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} |
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@Override |
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protected void implRegister(SelectionKeyImpl ski) { |
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int fd = IOUtil.fdVal(ski.channel.getFD()); |
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fdToKey.put(Integer.valueOf(fd), ski); |
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keys.add(ski); |
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} |
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protected void implDereg(SelectionKeyImpl ski) throws IOException { |
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int i = ski.getIndex(); |
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assert (i >= 0); |
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int fd = ski.channel.getFDVal(); |
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fdToKey.remove(Integer.valueOf(fd)); |
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pollWrapper.release(fd); |
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ski.setIndex(-1); |
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keys.remove(ski); |
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selectedKeys.remove(ski); |
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deregister((AbstractSelectionKey)ski); |
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SelectableChannel selch = ski.channel(); |
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if (!selch.isOpen() && !selch.isRegistered()) |
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((SelChImpl)selch).kill(); |
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} |
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@Override |
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public void putEventOps(SelectionKeyImpl sk, int ops) { |
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ensureOpen(); |
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int fd = sk.channel.getFDVal(); |
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pollWrapper.setInterest(fd, ops); |
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} |
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@Override |
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public Selector wakeup() { |
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synchronized (interruptLock) { |
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if (!interruptTriggered) { |
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pollWrapper.interrupt(); |
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interruptTriggered = true; |
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} |
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} |
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return this; |
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} |
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} |