Signed-off-by: Christoph Läubrich <[email protected]>

org.eclipse.m2e.launching/plugin.xml

@@ -243,5 +243,14 @@
             class="org.eclipse.m2e.internal.launch.MavenConsoleLineTracker"
             processType="java"/>
    </extension>
+   <extension
+         point="org.eclipse.m2e.launching.mavenLaunchParticipants">
+      <mavenLaunchParticipant
+            class="org.eclipse.m2e.internal.launch.MavenBuildConnectionLaunchParticipant"
+            id="org.eclipse.m2e.launching.buildevents"
+            modes="run,debug"
+            name="Maven Build Events">
+      </mavenLaunchParticipant>
+   </extension>
 
 </plugin>

org.eclipse.m2e.launching/src/org/eclipse/m2e/internal/launch/MavenBuildConnectionLaunchParticipant.java

@@ -0,0 +1,79 @@
+/********************************************************************************
+ * Copyright (c) 2022, 2024 Hannes Wellmann and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   Hannes Wellmann - initial API and implementation
+ *   Christoph Läubrich - refactor into {@link IMavenLaunchParticipant}
+ ********************************************************************************/
+
+package org.eclipse.m2e.internal.launch;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.debug.core.DebugPlugin;
+import org.eclipse.debug.core.ILaunch;
+import org.eclipse.debug.core.ILaunchConfiguration;
+import org.eclipse.debug.core.ILaunchesListener2;
+import org.eclipse.debug.core.sourcelookup.ISourceLookupParticipant;
+
+import org.eclipse.m2e.core.internal.launch.MavenEmbeddedRuntime;
+import org.eclipse.m2e.internal.maven.listener.M2EMavenBuildDataBridge;
+
+
+public class MavenBuildConnectionLaunchParticipant implements IMavenLaunchParticipant {
+
+  static {
+    DebugPlugin.getDefault().getLaunchManager().addLaunchListener(new ILaunchesListener2() {
+      public void launchesRemoved(ILaunch[] launches) {
+        ensureClosed(launches);
+      }
+
+      private void ensureClosed(ILaunch[] launches) {
+        Arrays.stream(launches).flatMap(l -> MavenBuildConnectionProcess.get(l).stream())
+            .forEach(MavenBuildConnectionProcess::terminate);
+      }
+
+      public void launchesTerminated(ILaunch[] launches) {
+        ensureClosed(launches);
+      }
+
+      public void launchesAdded(ILaunch[] launches) { // ignore
+      }
+
+      public void launchesChanged(ILaunch[] launches) { // ignore
+      }
+    });
+  }
+
+  public String getProgramArguments(ILaunchConfiguration configuration, ILaunch launch, IProgressMonitor monitor) {
+    try {
+      if(MavenLaunchUtils.getMavenRuntime(launch.getLaunchConfiguration()) instanceof MavenEmbeddedRuntime) {
+
+        MavenBuildConnectionProcess process = new MavenBuildConnectionProcess(launch);
+        return M2EMavenBuildDataBridge.prepareConnection(launch.getLaunchConfiguration().getName(), process);
+      }
+    } catch(CoreException | IOException ex) { // ignore
+    }
+    return null;
+  }
+
+  public String getVMArguments(ILaunchConfiguration configuration, ILaunch launch, IProgressMonitor monitor) {
+    return null;
+  }
+
+  public List<ISourceLookupParticipant> getSourceLookupParticipants(ILaunchConfiguration configuration, ILaunch launch,
+      IProgressMonitor monitor) {
+    return List.of();
+  }
+
+}

org.eclipse.m2e.launching/src/org/eclipse/m2e/internal/launch/MavenBuildConnectionProcess.java

@@ -0,0 +1,155 @@
+/********************************************************************************
+ * Copyright (c) 2024 Christoph Läubrich and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   Christoph Läubrich - initial API and implementation
+ ********************************************************************************/
+
+package org.eclipse.m2e.internal.launch;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.eclipse.debug.core.DebugEvent;
+import org.eclipse.debug.core.DebugPlugin;
+import org.eclipse.debug.core.ILaunch;
+import org.eclipse.debug.core.model.IProcess;
+import org.eclipse.debug.core.model.IStreamsProxy;
+
+import org.eclipse.m2e.core.embedder.ArtifactKey;
+import org.eclipse.m2e.internal.maven.listener.MavenBuildConnection;
+import org.eclipse.m2e.internal.maven.listener.MavenBuildConnectionListener;
+import org.eclipse.m2e.internal.maven.listener.MavenProjectBuildData;
+
+
+/**
+ * This is the representation of the MavenBuildConnection we use to communicate with the remote maven process.
+ */
+public class MavenBuildConnectionProcess implements IProcess, MavenBuildConnectionListener {
+
+  Map<ArtifactKey, CompletableFuture<MavenProjectBuildData>> projects = new ConcurrentHashMap<>();
+
+  private ILaunch launch;
+
+  private MavenBuildConnection connection;
+
+  private Map<String, String> attributes = new HashMap<>();
+
+  private AtomicBoolean terminated = new AtomicBoolean();
+
+  private String label;
+
+  /**
+   * @param launch
+   */
+  public MavenBuildConnectionProcess(ILaunch launch) {
+    this.launch = launch;
+  }
+
+  public <T> T getAdapter(Class<T> adapter) {
+    return null;
+  }
+
+  public boolean canTerminate() {
+    return false;
+  }
+
+  public boolean isTerminated() {
+    return connection != null && connection.isCompleted();
+  }
+
+  public void terminate() {
+    if(connection != null && terminated.compareAndSet(false, true)) {
+      connection.close();
+      fireEvent(new DebugEvent(this, DebugEvent.TERMINATE));
+      for(CompletableFuture<MavenProjectBuildData> future : projects.values()) {
+        future.cancel(true);
+      }
+    }
+  }
+
+  public String getLabel() {
+    // TODO fetch the maven version from the remove process like mvn -V ... 
+    if(label != null) {
+      return "Maven<" + label + ">";
+    }
+    return "Maven";
+  }
+
+  public ILaunch getLaunch() {
+    return launch;
+  }
+
+  public IStreamsProxy getStreamsProxy() {
+    return null;
+  }
+
+  public void setAttribute(String key, String value) {
+    attributes.put(key, value);
+    fireEvent(new DebugEvent(this, DebugEvent.CHANGE));
+  }
+
+  public String getAttribute(String key) {
+    return attributes.get(key);
+  }
+
+  public int getExitValue() {
+    return 0;
+  }
+
+  private static void fireEvent(DebugEvent event) {
+    DebugPlugin manager = DebugPlugin.getDefault();
+    if(manager != null) {
+      manager.fireDebugEventSet(new DebugEvent[] {event});
+    }
+  }
+
+  public static Optional<MavenBuildConnectionProcess> get(ILaunch launch) {
+    for(IProcess process : launch.getProcesses()) {
+      if(process instanceof MavenBuildConnectionProcess p) {
+        return Optional.of(p);
+      }
+    }
+    return Optional.empty();
+  }
+
+  /**
+   * @param launch2
+   * @param groupId
+   * @param artifactId
+   * @param version
+   * @return
+   */
+  public CompletableFuture<MavenProjectBuildData> getBuildProject(String groupId, String artifactId, String version) {
+    return projects.computeIfAbsent(new ArtifactKey(groupId, artifactId, version, null),
+        x -> new CompletableFuture<>());
+  }
+
+  public void onOpen(String label, MavenBuildConnection connection) {
+    this.label = label;
+    this.connection = connection;
+    getLaunch().addProcess(this);
+    fireEvent(new DebugEvent(this, DebugEvent.CREATE));
+
+  }
+
+  public void onClose() {
+    terminate();
+  }
+
+  public void onData(MavenProjectBuildData buildData) {
+    projects.computeIfAbsent(new ArtifactKey(buildData.groupId, buildData.artifactId, buildData.version, null), x -> new CompletableFuture<>())
+        .complete(buildData);
+  }
+
+}