| /* |
| * Copyright (c) 2014, 2017, 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 jdk.jshell.execution; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.PrintStream; |
| import java.lang.reflect.Method; |
| import java.net.Socket; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.function.Consumer; |
| import jdk.jshell.spi.ExecutionControl; |
| import static jdk.jshell.execution.Util.forwardExecutionControlAndIO; |
| |
| /** |
| * The remote agent runs in the execution process (separate from the main JShell |
| * process). This agent loads code over a socket from the main JShell process, |
| * executes the code, and other misc, Specialization of |
| * {@link DirectExecutionControl} which adds stop support controlled by |
| * an external process. Designed to work with {@link JdiDefaultExecutionControl}. |
| * |
| * @author Jan Lahoda |
| * @author Robert Field |
| * @since 9 |
| */ |
| public class RemoteExecutionControl extends DirectExecutionControl implements ExecutionControl { |
| |
| /** |
| * Launch the agent, connecting to the JShell-core over the socket specified |
| * in the command-line argument. |
| * |
| * @param args standard command-line arguments, expectation is the socket |
| * number is the only argument |
| * @throws Exception any unexpected exception |
| */ |
| public static void main(String[] args) throws Exception { |
| String loopBack = null; |
| Socket socket = new Socket(loopBack, Integer.parseInt(args[0])); |
| InputStream inStream = socket.getInputStream(); |
| OutputStream outStream = socket.getOutputStream(); |
| Map<String, Consumer<OutputStream>> outputs = new HashMap<>(); |
| outputs.put("out", st -> System.setOut(new PrintStream(st, true))); |
| outputs.put("err", st -> System.setErr(new PrintStream(st, true))); |
| Map<String, Consumer<InputStream>> input = new HashMap<>(); |
| input.put("in", System::setIn); |
| forwardExecutionControlAndIO(new RemoteExecutionControl(), inStream, outStream, outputs, input); |
| } |
| |
| // These three variables are used by the main JShell process in interrupting |
| // the running process. Access is via JDI, so the reference is not visible |
| // to code inspection. |
| private boolean inClientCode; // Queried by the main process (in superclass) |
| private boolean expectingStop; // Set by the main process |
| // Set by the main process |
| |
| // thrown by the main process via JDI: |
| private final StopExecutionException stopException = new StopExecutionException(); |
| |
| /** |
| * Creates an instance, delegating loader operations to the specified |
| * delegate. |
| * |
| * @param loaderDelegate the delegate to handle loading classes |
| */ |
| public RemoteExecutionControl(LoaderDelegate loaderDelegate) { |
| super(loaderDelegate); |
| } |
| |
| /** |
| * Create an instance using the default class loading. |
| */ |
| public RemoteExecutionControl() { |
| } |
| |
| /** |
| * Redefine processing on the remote end is only to register the redefined classes |
| */ |
| @Override |
| public void redefine(ClassBytecodes[] cbcs) |
| throws ClassInstallException, NotImplementedException, EngineTerminationException { |
| classesRedefined(cbcs); |
| } |
| |
| @Override |
| public void stop() throws EngineTerminationException, InternalException { |
| // handled by JDI |
| } |
| |
| // Overridden only so this stack frame is seen |
| @Override |
| protected String invoke(Method doitMethod) throws Exception { |
| return super.invoke(doitMethod); |
| } |
| |
| // Overridden only so this stack frame is seen |
| @Override |
| public String varValue(String className, String varName) throws RunException, EngineTerminationException, InternalException { |
| return super.varValue(className, varName); |
| } |
| |
| @Override |
| protected String throwConvertedInvocationException(Throwable cause) throws RunException, InternalException { |
| if (cause instanceof StopExecutionException) { |
| expectingStop = false; |
| throw new StoppedException(); |
| } else { |
| return super.throwConvertedInvocationException(cause); |
| } |
| } |
| |
| @Override |
| protected String throwConvertedOtherException(Throwable ex) throws RunException, InternalException { |
| if (ex instanceof StopExecutionException || |
| ex.getCause() instanceof StopExecutionException) { |
| expectingStop = false; |
| throw new StoppedException(); |
| } |
| return super.throwConvertedOtherException(ex); |
| } |
| |
| @Override |
| protected void clientCodeEnter() { |
| expectingStop = false; |
| inClientCode = true; |
| } |
| |
| @Override |
| protected void clientCodeLeave() throws InternalException { |
| inClientCode = false; |
| while (expectingStop) { |
| try { |
| Thread.sleep(0); |
| } catch (InterruptedException ex) { |
| throw new InternalException("*** Sleep interrupted while waiting for stop exception: " + ex); |
| } |
| } |
| } |
| |
| @SuppressWarnings("serial") // serialVersionUID intentionally omitted |
| private class StopExecutionException extends ThreadDeath { |
| |
| @Override |
| public synchronized Throwable fillInStackTrace() { |
| return this; |
| } |
| } |
| |
| } |