93 lines
2.8 KiB
Java
93 lines
2.8 KiB
Java
/*
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* Copyright (c) 2016, 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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import java.io.IOException;
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import java.nio.ByteBuffer;
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/**
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* Generic JDWP command
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* @param <T> the corresponding JDWP reply class, to construct a reply object
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*/
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public abstract class JdwpCmd<T extends JdwpReply> {
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private ByteBuffer data;
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private static int id = 1;
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private final byte FLAGS = 0;
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private T reply;
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private final int dataLen;
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private final int HEADER_LEN = 11;
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/**
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* JDWWp command
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* @param cmd command code
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* @param cmdSet command set
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* @param replyClz command reply class
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* @param dataLen length of additional data for the command
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*/
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JdwpCmd(int cmd, int cmdSet, Class<T> replyClz, int dataLen) {
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this.dataLen = dataLen;
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data = ByteBuffer.allocate(HEADER_LEN + dataLen);
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data.putInt(HEADER_LEN + dataLen);
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data.putInt(id++);
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data.put(FLAGS);
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data.put((byte) cmdSet);
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data.put((byte) cmd);
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if (replyClz != null) {
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try {
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reply = replyClz.newInstance();
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} catch (Exception ex) {
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ex.printStackTrace();
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}
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}
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}
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JdwpCmd(int cmd, int cmdSet, Class<T> replyClz) {
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this(cmd, cmdSet, replyClz, 0);
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}
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int getDataLength() {
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return dataLen;
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}
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public final T send(JdwpChannel channel) throws IOException {
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channel.write(data.array(), HEADER_LEN + getDataLength());
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if (reply != null) {
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reply.initFromStream(channel.getInputStream());
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}
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return (T) reply;
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}
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protected void putRefId(long refId) {
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data.putLong(refId);
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}
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protected void putInt(int val) {
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data.putInt(val);
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}
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protected static int refLen() {
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return 8;
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}
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}
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