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