--- a/jdk/src/demo/solaris/jni/Poller/Poller.java Thu Apr 20 18:14:05 2017 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,335 +0,0 @@
-/*
- * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of Oracle nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/*
- * This source code is provided to illustrate the usage of a given feature
- * or technique and has been deliberately simplified. Additional steps
- * required for a production-quality application, such as security checks,
- * input validation and proper error handling, might not be present in
- * this sample code.
- */
-
-
-import java.lang.reflect.*;
-import java.io.*;
-import java.net.*;
-
-/**
- * This class is provided for access to the underlying poll(2)
- * or /dev/poll kernel interfaces. This may be needed for
- * multiplexing IO when an application cannot afford to have
- * a thread block on each outstanding IO request.
- *
- * It currently supports the same basic functionality as the
- * C poll(2) API, although for efficiency we needed to avoid
- * passing the entire pollfd array for every call. See man
- * pages for poll(2) for info on C API and event types.
- *
- *
- * @author Bruce Chapman
- * @see java.io.FileDescriptor
- * @see java.net.Socket
- * @see attached README.txt
- * @since 1.2
- */
-
-public class Poller {
- /**
- * Solaris POLL event types.
- */
- public final static short POLLERR = 0x08;
- public final static short POLLHUP = 0x10;
- public final static short POLLNVAL = 0x20;
- public final static short POLLIN = 1;
- public final static short POLLPRI = 2;
- public final static short POLLOUT = 4;
- public final static short POLLRDNORM = 0x40;
- public final static short POLLWRNORM = POLLOUT ;
- public final static short POLLRDBAND = 0x80;
- public final static short POLLWRBAND = 0x100;
- public final static short POLLNORM = POLLRDNORM;
-
- /*
- * This global synchronization object must be used for all
- * creation or destruction of Poller objects.
- */
- private final static Object globalSync = new Object();
-
- /*
- * The handle for a Poller Object...is used in the JNI C code
- * where all the associated data is kept.
- */
- private int handle;
-
- /**
- * Constructs an instance of a <code>Poller</code> object.
- * Native code uses sysconf(_SC_OPEN_MAX) to determine how
- * many fd/skt objects this Poller object can contain.
- */
- public Poller() throws Exception {
- synchronized(globalSync) {
- this.handle = nativeCreatePoller(-1);
- }
- }
-
- /**
- * Constructs an instance of a <code>Poller</code> object.
- * @param maxFd the maximum number of FileDescriptors/Sockets
- * this Poller object can contain.
- */
- public Poller(int maxFd) throws Exception {
- synchronized(globalSync) {
- this.handle = nativeCreatePoller(maxFd);
- }
- }
-
- /**
- * Needed to clean up at the JNI C level when object is GCd.
- */
- protected void finalize() throws Throwable {
- synchronized(globalSync) {
- nativeDestroyPoller(handle);
- super.finalize();
- }
- }
-
- /**
- * Since we can't guarantee WHEN finalize is called, we may
- * recycle on our own.
- * @param maxFd the maximum number of FileDescriptors/Sockets
- * this Poller object can contain.
- */
- public void reset(int maxFd) throws Exception {
- synchronized(globalSync) {
- nativeDestroyPoller(handle);
- this.handle = nativeCreatePoller(maxFd);
- }
- }
- /**
- * Since we can't guarantee WHEN finalize is called, we may
- * recycle on our own.
- */
- public void reset() throws Exception {
- synchronized(globalSync) {
- nativeDestroyPoller(handle);
- this.handle = nativeCreatePoller(-1);
- }
- }
-
- /**
- * Add FileDescriptor to the set handled by this Poller object.
- *
- * @param fdObj the FileDescriptor, Socket, or ServerSocket to add.
- * @param event the bitmask of events we are interested in.
- * @return the OS level fd associated with this IO Object
- * (which is what waitMultiple() stores in fds[])
- */
- public synchronized int add(Object fdObj, short event) throws Exception {
- return nativeAddFd(handle,findfd(fdObj), event);
- }
-
- /**
- * Remove FileDescriptor from the set handled by this Poller object.
- *
- * Must be called before the fd/skt is closed.
- * @param fdObj the FileDescriptor, Socket, or ServerSocket to remove.
- * @return true if removal succeeded.
- */
- public synchronized boolean remove(Object fdObj) throws Exception {
- return (nativeRemoveFd(handle,findfd(fdObj)) == 1);
- }
- /**
- * Check if fd or socket is already in the set handled by this Poller object
- *
- * @param fdObj the FileDescriptor or [Server]Socket to check.
- * @return true if fd/skt is in the set for this Poller object.
- */
- public synchronized boolean isMember(Object fdObj) throws Exception {
- return (nativeIsMember(handle,findfd(fdObj)) == 1);
- }
- /**
- * Wait on Multiple IO Objects.
- *
- * @param maxRet the maximum number of fds[] and revents[] to return.
- * @param fds[] (return) an array of ints in which to store fds with
- * available data upon a successful non-timeout return.
- * fds.length must be >= maxRet
- * @param revents[] (return) the actual events available on the
- * same-indexed fds[] (i.e. fds[0] has events revents[0])
- * revents.length must be >= maxRet
- *
- * Note : both above arrays are "dense," i.e. only fds[] with events
- * available are returned.
- *
- * @param timeout the maximum number of milliseconds to wait for
- * events before timing out.
- * @return the number of fds with triggered events.
- *
- * Note : convenience methods exist for skipping the timeout parameter
- * or the maxRet parameter (in the case of no maxRet, fds.length
- * must equal revents.length)
- *
- * obj.waitMultiple(null,null,timeout) can be used for pausing the LWP
- * (much more reliable and scalable than Thread.sleep() or Object.wait())
- */
- public synchronized int waitMultiple(int maxRet, int[] fds,short[] revents,
- long timeout) throws Exception
- {
- if ((revents == null) || (fds == null)) {
- if (maxRet > 0) {
- throw new NullPointerException("fds or revents is null");
- }
- } else if ( (maxRet < 0) ||
- (maxRet > revents.length) || (maxRet > fds.length) ) {
- throw new IllegalArgumentException("maxRet out of range");
- }
-
- int ret = nativeWait(handle, maxRet, fds, revents, timeout);
- if (ret < 0) {
- throw new InterruptedIOException();
- }
- return ret;
- }
-
- /**
- * Wait on Multiple IO Objects (no timeout).
- * A convenience method for waiting indefinitely on IO events
- *
- * @see Poller#waitMultiple
- *
- */
- public int waitMultiple(int maxRet, int[] fds, short[] revents)
- throws Exception
- {
- return waitMultiple(maxRet, fds, revents,-1L); // already synchronized
- }
-
- /**
- * Wait on Multiple IO Objects (no maxRet).
- * A convenience method for waiting on IO events when the fds
- * and revents arrays are the same length and that specifies the
- * maximum number of return events.
- *
- * @see Poller#waitMultiple
- *
- */
- public synchronized int waitMultiple(int[] fds, short[] revents,
- long timeout) throws Exception
- {
- if ((revents == null) && (fds == null)) {
- return nativeWait(handle,0,null,null,timeout);
- } else if ((revents == null) || (fds == null)) {
- throw new NullPointerException("revents or fds is null");
- } else if (fds.length == revents.length) {
- return nativeWait(handle, fds.length, fds, revents, timeout);
- }
- throw new IllegalArgumentException("fds.length != revents.length");
- }
-
-
- /**
- * Wait on Multiple IO Objects (no maxRet/timeout).
- * A convenience method for waiting on IO events when the fds
- * and revents arrays are the same length and that specifies the
- * maximum number of return events, and when waiting indefinitely
- * for IO events to occur.
- *
- * @see Poller#waitMultiple
- *
- */
- public int waitMultiple(int[] fds, short[] revents)
- throws Exception
- {
- if ((revents == null) || (fds == null)) {
- throw new NullPointerException("fds or revents is null");
- } else if (fds.length == revents.length) {
- return waitMultiple(revents.length,fds,revents,-1L); // already sync
- }
- throw new IllegalArgumentException("fds.length != revents.length");
- }
-
- // Utility - get (int) fd from FileDescriptor or [Server]Socket objects.
-
- private int findfd(Object fdObj) throws Exception {
- Class cl;
- Field f;
- Object val, implVal;
-
- if ((fdObj instanceof java.net.Socket) ||
- (fdObj instanceof java.net.ServerSocket)) {
- cl = fdObj.getClass();
- f = cl.getDeclaredField("impl");
- f.setAccessible(true);
- val = f.get(fdObj);
- cl = f.getType();
- f = cl.getDeclaredField("fd");
- f.setAccessible(true);
- implVal = f.get(val);
- cl = f.getType();
- f = cl.getDeclaredField("fd");
- f.setAccessible(true);
- return ((Integer) f.get(implVal)).intValue();
- } else if ( fdObj instanceof java.io.FileDescriptor ) {
- cl = fdObj.getClass();
- f = cl.getDeclaredField("fd");
- f.setAccessible(true);
- return ((Integer) f.get(fdObj)).intValue();
- }
- else {
- throw new IllegalArgumentException("Illegal Object type.");
- }
- }
-
- // Actual NATIVE calls
-
- private static native int nativeInit();
- private native int nativeCreatePoller(int maxFd) throws Exception;
- private native void nativeDestroyPoller(int handle) throws Exception;
- private native int nativeAddFd(int handle, int fd, short events)
- throws Exception;
- private native int nativeRemoveFd(int handle, int fd) throws Exception;
- private native int nativeRemoveIndex(int handle, int index)
- throws Exception;
- private native int nativeIsMember(int handle, int fd) throws Exception;
- private native int nativeWait(int handle, int maxRet, int[] fds,
- short[] events, long timeout)
- throws Exception;
- /**
- * Get number of active CPUs in this machine
- * to determine proper level of concurrency.
- */
- public static native int getNumCPUs();
-
- static {
- System.loadLibrary("poller");
- nativeInit();
- }
-}