jarek/12: switch interrupting mode to message

base-api/src/main/java/com/twosigma/beakerx/evaluator/BaseEvaluator.java

@@ -36,7 +36,6 @@
 import org.apache.commons.io.FileUtils;
 
 import java.io.File;
-import java.net.URISyntaxException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
@@ -52,7 +51,9 @@
 
 public abstract class BaseEvaluator implements Evaluator {
 
-  public static String INTERUPTED_MSG = "interrupted";
+  public static String INTERUPTED_MSG = "KeyboardInterrupt";
+
+  private boolean interrupting = false;
   protected final String shellId;
   protected final String sessionId;
   private final ClasspathScanner classpathScanner;
@@ -109,6 +110,29 @@ public void endEvaluation() {
     classLoaderSwitcher.end();
   }
 
+  @Override
+  public void interruptKernel() {
+    interrupting = true;
+    killAllThreads();
+  }
+
+  @Override
+  public void interruptKernelDone() {
+    interrupting = false;
+  }
+
+  public boolean isInterrupting() {
+    return interrupting;
+  }
+
+  @Override
+  public TryResult processResult(TryResult result) {
+    if (interrupting) {
+      return TryResult.createError(INTERUPTED_MSG);
+    }
+    return result;
+  }
+
   CompletableFuture<TryResult> background;
 
   protected TryResult evaluate(EvaluationObject seo, Callable<TryResult> callable) {

base-api/src/main/java/com/twosigma/beakerx/evaluator/Evaluator.java

@@ -85,4 +85,12 @@ public interface Evaluator {
   void startEvaluation();
 
   void endEvaluation();
+
+  void interruptKernel();
+
+  void interruptKernelDone();
+
+  boolean isInterrupting();
+
+  TryResult processResult(TryResult result);
 }

base-api/src/main/java/com/twosigma/beakerx/kernel/KernelFunctionality.java

@@ -59,7 +59,11 @@ public interface KernelFunctionality {
 
   void cancelExecution(GroupName groupName);
 
-  void killAllThreads();
+  void interruptKernel();
+
+  void interruptKernelDone();
+
+  boolean isInterrupting();
 
   Handler<Message> getHandler(JupyterMessages type);
 
@@ -120,4 +124,5 @@ public interface KernelFunctionality {
   void startEvaluation();
 
   void endEvaluation();
+
 }

base-api/src/main/java/com/twosigma/beakerx/kernel/msg/JupyterMessages.java

@@ -51,7 +51,9 @@ public enum JupyterMessages {
   ERROR,
   IS_COMPLETE_REQUEST,
   INPUT_REQUEST,
-  IS_COMPLETE_REPLY;
+  IS_COMPLETE_REPLY,
+  INTERRUPT_REQUEST,
+  INTERRUPT_REPLY;
 
   public String getName() {
     return this.name().toLowerCase();
@@ -70,4 +72,4 @@ public static JupyterMessages getType(final String input){
     return ret;
   }
 
-}
+}

base-test/src/main/java/com/twosigma/beakerx/KernelTest.java

@@ -296,10 +296,20 @@ public void cancelExecution(GroupName groupName) {
   }
 
   @Override
-  public void killAllThreads() {
+  public void interruptKernel() {
 
   }
 
+  @Override
+  public void interruptKernelDone() {
+
+  }
+
+  @Override
+  public boolean isInterrupting() {
+    return false;
+  }
+
   @Override
   public Handler<Message> getHandler(JupyterMessages type) {
     return null;
@@ -525,13 +535,5 @@ public List<EvaluationObject> getObjectList() {
     }
   }
 
-//  public static EvaluationObject createSeo(String code) {
-//    return new SimpleEvaluationObject(code, new SeoConfigurationFactoryMock());
-//  }
-//
-//  public static EvaluationObject createSeo(String code, Message message) {
-//    return new SimpleEvaluationObject(code, new SeoConfigurationFactoryMock(message));
-//  }
-
 }
 

base/src/main/java/com/twosigma/beakerx/KernelInfoHandler.java

@@ -15,29 +15,26 @@
  */
 package com.twosigma.beakerx;
 
-import static com.twosigma.beakerx.kernel.msg.JupyterMessages.KERNEL_INFO_REPLY;
-import static com.twosigma.beakerx.handler.KernelHandlerWrapper.wrapBusyIdle;
-import static java.util.Arrays.asList;
-
-import com.twosigma.beakerx.kernel.KernelFunctionality;
 import com.twosigma.beakerx.handler.KernelHandler;
-import com.twosigma.beakerx.kernel.KernelManager;
+import com.twosigma.beakerx.kernel.KernelFunctionality;
 import com.twosigma.beakerx.message.Header;
 import com.twosigma.beakerx.message.Message;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.HashMap;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import static com.twosigma.beakerx.handler.KernelHandlerWrapper.wrapBusyIdle;
+import static com.twosigma.beakerx.kernel.msg.JupyterMessages.KERNEL_INFO_REPLY;
+import static java.util.Arrays.asList;
 
 public abstract class KernelInfoHandler extends KernelHandler<Message> {
 
   private final static Logger logger = LoggerFactory.getLogger(KernelInfoHandler.class);
   public static final String PROTOCOL_VERSION = "protocol_version";
   public static final String PROTOCOL_VERSION_NUMBER = "5.3";
-  public static final String INTERRUPT_KERNEL = "interrupt_kernel";
 
   public KernelInfoHandler(KernelFunctionality kernel) {
     super(kernel);
@@ -49,12 +46,12 @@ public void handle(Message message) {
   }
 
   private void handleMsg(Message message) {
-    logger.debug("Processing kernel info request");
-    Message reply = new Message(new Header(KERNEL_INFO_REPLY, message.getHeader().getSession()));
-    reply.setContent(content());
-    reply.setParentHeader(message.getHeader());
-    reply.setIdentities(message.getIdentities());
-    send(reply);
+      logger.debug("Processing kernel info request");
+      Message reply = new Message(new Header(KERNEL_INFO_REPLY, message.getHeader().getSession()));
+      reply.setContent(content());
+      reply.setParentHeader(message.getHeader());
+      reply.setIdentities(message.getIdentities());
+      send(reply);
   }
 
   private HashMap<String, Serializable> languageInfo() {
@@ -70,7 +67,6 @@ private HashMap<String, Serializable> content() {
     map.put("help_links", getHelpLinks());
     map.put("beakerx", true);
     map.put("status", "ok");
-    map.put("url_to_interrupt", KernelManager.get().getBeakerXServer().getURL() + INTERRUPT_KERNEL);
     return doContent(map);
   }
 

base/src/main/java/com/twosigma/beakerx/kernel/Kernel.java

@@ -20,6 +20,7 @@
 import com.twosigma.beakerx.DisplayerDataMapper;
 import com.twosigma.beakerx.TryResult;
 import com.twosigma.beakerx.autocomplete.AutocompleteResult;
+import com.twosigma.beakerx.evaluator.BaseEvaluator;
 import com.twosigma.beakerx.evaluator.Evaluator;
 import com.twosigma.beakerx.evaluator.Hook;
 import com.twosigma.beakerx.handler.Handler;
@@ -28,6 +29,7 @@
 import com.twosigma.beakerx.jvm.object.EvaluationObject;
 import com.twosigma.beakerx.kernel.comm.Comm;
 import com.twosigma.beakerx.kernel.handler.CommOpenHandler;
+import com.twosigma.beakerx.kernel.handler.ExecuteRequestHandler;
 import com.twosigma.beakerx.kernel.magic.command.MagicCommandConfiguration;
 import com.twosigma.beakerx.kernel.magic.command.MagicCommandType;
 import com.twosigma.beakerx.kernel.msg.JupyterMessages;
@@ -159,8 +161,20 @@ public void updateEvaluatorParameters(final EvaluatorParameters kernelParameters
   }
 
   @Override
-  public void killAllThreads() {
-    evaluator.killAllThreads();
+  public void interruptKernel() {
+    evaluator.interruptKernel();
+    ExecuteRequestHandler executeRequestHandler = handlers.getExecuteRequestHandler();
+    executeRequestHandler.interruptKernel();
+  }
+
+  @Override
+  public void interruptKernelDone() {
+    evaluator.interruptKernelDone();
+  }
+
+  @Override
+  public boolean isInterrupting() {
+    return evaluator.isInterrupting();
   }
 
   @Override

base/src/main/java/com/twosigma/beakerx/kernel/KernelHandlers.java

@@ -21,6 +21,7 @@
 import com.twosigma.beakerx.kernel.handler.CommMsgHandler;
 import com.twosigma.beakerx.kernel.handler.CommOpenHandler;
 import com.twosigma.beakerx.kernel.handler.ExecuteRequestHandler;
+import com.twosigma.beakerx.kernel.handler.InterruptMsgHandler;
 import com.twosigma.beakerx.kernel.msg.JupyterMessages;
 import com.twosigma.beakerx.handler.IsCompleteRequestHandler;
 import com.twosigma.beakerx.handler.KernelHandler;
@@ -60,6 +61,7 @@ private Map<JupyterMessages, KernelHandler<Message>> createHandlers(final CommOp
     handlers.put(JupyterMessages.COMM_CLOSE, new CommCloseHandler(kernel));
     handlers.put(JupyterMessages.COMM_MSG, new CommMsgHandler(kernel));
     handlers.put(JupyterMessages.IS_COMPLETE_REQUEST, new IsCompleteRequestHandler(kernel));
+    handlers.put(JupyterMessages.INTERRUPT_REQUEST, new InterruptMsgHandler(kernel));
     return handlers;
   }
 

base/src/main/java/com/twosigma/beakerx/kernel/handler/ExecuteRequestHandler.java

@@ -27,7 +27,11 @@
 
 import java.io.Serializable;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.FutureTask;
 
 import static com.twosigma.beakerx.kernel.msg.JupyterMessages.EXECUTE_INPUT;
 import static java.util.Collections.singletonList;
@@ -41,34 +45,51 @@ public class ExecuteRequestHandler extends KernelHandler<Message> {
 
   private final SimpleEvaluationObjectFactory seof;
   private int executionCount;
+  private ExecutorService executorService = Executors.newFixedThreadPool(1);
 
   public ExecuteRequestHandler(KernelFunctionality kernel) {
     super(kernel);
     this.executionCount = 0;
     this.seof = new SimpleEvaluationObjectFactory();
   }
 
+  private FutureTask<String> current;
+
   @Override
   public void handle(Message message) {
     try {
-      handleMsg(message);
+      executorService.execute(() -> handleMsg(message));
     } catch (Exception e) {
       handleException(message, e);
     }
   }
 
+
   private void handleMsg(Message message) {
-    executionCount += 1;
-    kernel.sendBusyMessage(message);
-    String codeString = takeCodeFrom(message);
-    announceTheCode(message, codeString);
-    Code code = new CodeFactory(MessageCreator.get(), seof).create(codeString, message, kernel);
-    code.execute(kernel, executionCount);
-    finishExecution(message);
+    current = new FutureTask<>(() -> {
+      try {
+        runCode(message);
+      } catch (Exception e) {
+        handleException(message, e);
+      }
+      return "ok";
+    });
+    current.run();
   }
 
-  private void finishExecution(Message message) {
-    kernel.sendIdleMessage(message);
+  private void runCode(Message message) {
+    if (kernel.isInterrupting()) {
+      Message abortedReply = MessageCreator.buildAbortedReply(message);
+      kernel.send(abortedReply);
+    } else {
+      kernel.sendBusyMessage(message);
+      executionCount += 1;
+      String codeString = takeCodeFrom(message);
+      announceTheCode(message, codeString);
+      Code code = new CodeFactory(MessageCreator.get(), seof).create(codeString, message, kernel);
+      code.execute(kernel, executionCount);
+      kernel.sendIdleMessage(message);
+    }
   }
 
   private String takeCodeFrom(Message message) {
@@ -99,4 +120,20 @@ private void handleException(Message message, Exception e) {
   public void exit() {
   }
 
+  public void interruptKernel() {
+    waitForTheEndOfTheCurrentCell();
+    List<Runnable> cells = executorService.shutdownNow();
+    cells.forEach(Runnable::run);
+    executorService = Executors.newFixedThreadPool(1);
+  }
+
+  private void waitForTheEndOfTheCurrentCell() {
+    if (current != null) {
+      try {
+        current.get();
+      } catch (Exception e) {
+        throw new RuntimeException(e);
+      }
+    }
+  }
 }

base/src/main/java/com/twosigma/beakerx/kernel/handler/InterruptMsgHandler.java

@@ -0,0 +1,48 @@
+/*
+ *  Copyright 2020 TWO SIGMA OPEN SOURCE, LLC
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package com.twosigma.beakerx.kernel.handler;
+
+import com.twosigma.beakerx.handler.KernelHandler;
+import com.twosigma.beakerx.kernel.KernelFunctionality;
+import com.twosigma.beakerx.kernel.msg.JupyterMessages;
+import com.twosigma.beakerx.message.Header;
+import com.twosigma.beakerx.message.Message;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class InterruptMsgHandler extends KernelHandler<Message> {
+
+  private final static Logger logger = LoggerFactory.getLogger(InterruptMsgHandler.class);
+
+  public InterruptMsgHandler(final KernelFunctionality kernel) {
+    super(kernel);
+  }
+
+  public void handle(Message message) {
+    Message interruptReply = createInterruptReply(JupyterMessages.INTERRUPT_REPLY, message);
+    kernel.send(interruptReply);
+    kernel.interruptKernel();
+    kernel.interruptKernelDone();
+    logger.info("Interrupting done");
+  }
+
+  private static Message createInterruptReply(JupyterMessages type, Message message) {
+    Message reply = new Message(new Header(type, message.getHeader().getSession()));
+    reply.setParentHeader(message.getHeader());
+    reply.setIdentities(message.getIdentities());
+    return reply;
+  }
+}