--- a/jdk/src/java.rmi/share/classes/sun/rmi/transport/tcp/MultiplexInputStream.java Sun Sep 03 19:31:11 2017 +0530
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,213 +0,0 @@
-/*
- * Copyright (c) 1996, 1997, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code 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
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package sun.rmi.transport.tcp;
-
-import java.io.*;
-
-/**
- * MultiplexInputStream manages receiving data over a connection managed
- * by a ConnectionMultiplexer object. This object is responsible for
- * requesting more bytes of data as space in its internal buffer becomes
- * available.
- *
- * @author Peter Jones
- */
-final class MultiplexInputStream extends InputStream {
-
- /** object managing multiplexed connection */
- private ConnectionMultiplexer manager;
-
- /** information about the connection this is the input stream for */
- private MultiplexConnectionInfo info;
-
- /** input buffer */
- private byte buffer[];
-
- /** number of real data bytes present in buffer */
- private int present = 0;
-
- /** current position to read from in input buffer */
- private int pos = 0;
-
- /** pending number of bytes this stream has requested */
- private int requested = 0;
-
- /** true if this connection has been disconnected */
- private boolean disconnected = false;
-
- /**
- * lock acquired to access shared variables:
- * buffer, present, pos, requested, & disconnected
- * WARNING: Any of the methods manager.send*() should not be
- * invoked while this lock is held, since they could potentially
- * block if the underlying connection's transport buffers are
- * full, and the manager may need to acquire this lock to process
- * and consume data coming over the underlying connection.
- */
- private Object lock = new Object();
-
- /** level at which more data is requested when read past */
- private int waterMark;
-
- /** data structure for holding reads of one byte */
- private byte temp[] = new byte[1];
-
- /**
- * Create a new MultiplexInputStream for the given manager.
- * @param manager object that manages this connection
- * @param info structure for connection this stream reads from
- * @param bufferLength length of input buffer
- */
- MultiplexInputStream(
- ConnectionMultiplexer manager,
- MultiplexConnectionInfo info,
- int bufferLength)
- {
- this.manager = manager;
- this.info = info;
-
- buffer = new byte[bufferLength];
- waterMark = bufferLength / 2;
- }
-
- /**
- * Read a byte from the connection.
- */
- public synchronized int read() throws IOException
- {
- int n = read(temp, 0, 1);
- if (n != 1)
- return -1;
- return temp[0] & 0xFF;
- }
-
- /**
- * Read a subarray of bytes from connection. This method blocks for
- * at least one byte, and it returns the number of bytes actually read,
- * or -1 if the end of the stream was detected.
- * @param b array to read bytes into
- * @param off offset of beginning of bytes to read into
- * @param len number of bytes to read
- */
- public synchronized int read(byte b[], int off, int len) throws IOException
- {
- if (len <= 0)
- return 0;
-
- int moreSpace;
- synchronized (lock) {
- if (pos >= present)
- pos = present = 0;
- else if (pos >= waterMark) {
- System.arraycopy(buffer, pos, buffer, 0, present - pos);
- present -= pos;
- pos = 0;
- }
- int freeSpace = buffer.length - present;
- moreSpace = Math.max(freeSpace - requested, 0);
- }
- if (moreSpace > 0)
- manager.sendRequest(info, moreSpace);
- synchronized (lock) {
- requested += moreSpace;
- while ((pos >= present) && !disconnected) {
- try {
- lock.wait();
- } catch (InterruptedException e) {
- }
- }
- if (disconnected && pos >= present)
- return -1;
-
- int available = present - pos;
- if (len < available) {
- System.arraycopy(buffer, pos, b, off, len);
- pos += len;
- return len;
- }
- else {
- System.arraycopy(buffer, pos, b, off, available);
- pos = present = 0;
- // could send another request here, if len > available??
- return available;
- }
- }
- }
-
- /**
- * Return the number of bytes immediately available for reading.
- */
- public int available() throws IOException
- {
- synchronized (lock) {
- return present - pos;
- }
- }
-
- /**
- * Close this connection.
- */
- public void close() throws IOException
- {
- manager.sendClose(info);
- }
-
- /**
- * Receive bytes transmitted from connection at remote endpoint.
- * @param length number of bytes transmitted
- * @param in input stream with those bytes ready to be read
- */
- void receive(int length, DataInputStream in)
- throws IOException
- {
- /* TO DO: Optimize so that data received from stream can be loaded
- * directly into user's buffer if there is a pending read().
- */
- synchronized (lock) {
- if ((pos > 0) && ((buffer.length - present) < length)) {
- System.arraycopy(buffer, pos, buffer, 0, present - pos);
- present -= pos;
- pos = 0;
- }
- if ((buffer.length - present) < length)
- throw new IOException("Receive buffer overflow");
- in.readFully(buffer, present, length);
- present += length;
- requested -= length;
- lock.notifyAll();
- }
- }
-
- /**
- * Disconnect this stream from all connection activity.
- */
- void disconnect()
- {
- synchronized (lock) {
- disconnected = true;
- lock.notifyAll();
- }
- }
-}