154 lines
4.6 KiB
Java
154 lines
4.6 KiB
Java
/*
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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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* 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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* 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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