author | iignatyev |
Wed, 30 May 2018 20:54:45 -0700 | |
changeset 50317 | cf71bff5f533 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 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. |
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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 nsk.share.jdwp; |
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import nsk.share.*; |
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import java.io.IOException; |
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//import java.util.Vector; |
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/** |
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* This class represents an abstract transport for JDWP. |
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*/ |
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public abstract class Transport extends Log.Logger { |
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public static final String LOG_PREFIX = "transport> "; |
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/** |
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* Make base <code>Transport</code> object providing with specified Log. |
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*/ |
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public Transport(Log log) { |
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super(log, LOG_PREFIX); |
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} |
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/** |
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* Return number of bytes that can be received. |
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*/ |
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public abstract int available() throws IOException; |
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/** |
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* Flushe bytes being buffered for writing if any. |
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*/ |
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public abstract void flush() throws IOException; |
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/** |
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* Receive the next byte of data. |
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* |
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* The value byte is returned as an int in the range 0 to 255. |
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* If no byte is available, the value -1 is returned. |
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*/ |
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public abstract byte read() throws IOException; |
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/** |
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* Send the specified byte. |
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*/ |
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public abstract void write(int b) throws IOException; |
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/** |
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* Send the specified bytes. |
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*/ |
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public void write(byte[] b, int off, int len) throws IOException { |
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for (int i = 0; i < len; i++) |
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write(b[off + i]); |
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} |
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/** |
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* Receive bytes of JDWP packet for default timeout. |
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*/ |
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public void read(Packet packet) throws IOException { |
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packet.readFrom(this); |
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} |
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/** |
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* Send and flushe bytes of JDWP packet. |
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*/ |
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public void write(Packet packet) throws IOException { |
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packet.writeTo(this); |
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flush(); |
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} |
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/** |
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* Perform JDWP "handshake" procedure. |
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*/ |
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public void handshake() throws IOException { |
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String hs = "JDWP-Handshake"; |
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byte[] hsb = hs.getBytes(); |
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write(hsb, 0, hsb.length); |
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flush(); |
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try { |
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Thread.currentThread().sleep(500); |
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} catch (InterruptedException e) { |
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throw new Failure(e); |
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} |
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int received = 0; |
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for (int i = 0; i < Binder.CONNECT_TRIES; i++) { |
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received = available(); |
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if (received < hsb.length) { |
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// System.err.println("Failed to hadshake try #" + i + ", bytes: " + received); |
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try { |
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Thread.currentThread().sleep(Binder.CONNECT_TRY_DELAY); |
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} catch (InterruptedException e) { |
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throw new Failure("Thread interrupted while sleeping between connection attempts:\n\t" |
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+ e); |
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} |
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} else { |
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// System.err.println("Successed to hadshake try #" + i + ", bytes: " + received); |
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for (int j = 0; j < hsb.length; j++) { |
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byte b = (byte) (read() & 0xFF); |
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if (b != hsb[j]) |
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throw new IOException("Target VM failed to handshake: unexpected byte #" + j |
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+ ": " + b + " (expected:" + hsb[j] + ")"); |
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} |
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return; |
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} |
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} |
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throw new IOException("Target VM failed to handshake: too few bytes in reply: " |
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+ received + "(expected: " + hsb.length + ")"); |
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} |
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|
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/** |
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* Set timeout for reading data in milliseconds. |
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* Timeout of 0 means wait infinitly. |
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*/ |
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public abstract void setReadTimeout(long millisecs) throws IOException; |
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|
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/** |
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* Close JDWP connection. |
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*/ |
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public abstract void close() throws IOException; |
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/** |
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* Perform finalization of object by closing JDWP connection. |
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*/ |
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protected void finalize() throws Throwable { |
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close(); |
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} |
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|
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} |