[MNG-8225] Fully concurrent builder for Maven 4

api/maven-api-core/src/main/java/org/apache/maven/api/Lifecycle.java

@@ -56,6 +56,7 @@ public interface Lifecycle extends ExtensibleEnum {
     // ======================
     String BEFORE = "before:";
     String AFTER = "after:";
+    String AT = "at:";
 
     /**
      * Name or identifier of this lifecycle.

maven-core/pom.xml

@@ -91,6 +91,14 @@ under the License.
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-api-impl</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-jline</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-slf4j-provider</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.maven.resolver</groupId>
       <artifactId>maven-resolver-api</artifactId>

maven-core/src/main/java/org/apache/maven/execution/BuildFailure.java

@@ -39,7 +39,19 @@ public class BuildFailure extends BuildSummary {
      * @param cause The cause of the build failure, may be {@code null}.
      */
     public BuildFailure(MavenProject project, long time, Throwable cause) {
-        super(project, time);
+        this(project, time, time, cause);
+    }
+
+    /**
+     * Creates a new build summary for the specified project.
+     *
+     * @param project The project being summarized, must not be {@code null}.
+     * @param execTime The exec time of the project in milliseconds.
+     * @param wallTime The wall time of the project in milliseconds.
+     * @param cause The cause of the build failure, may be {@code null}.
+     */
+    public BuildFailure(MavenProject project, long execTime, long wallTime, Throwable cause) {
+        super(project, execTime, wallTime);
         this.cause = cause;
     }
 

maven-core/src/main/java/org/apache/maven/execution/BuildSuccess.java

@@ -33,6 +33,17 @@ public class BuildSuccess extends BuildSummary {
      * @param time The build time of the project in milliseconds.
      */
     public BuildSuccess(MavenProject project, long time) {
-        super(project, time);
+        super(project, time, time);
+    }
+
+    /**
+     * Creates a new build summary for the specified project.
+     *
+     * @param project The project being summarized, must not be {@code null}.
+     * @param wallTime The wall time of the project in milliseconds.
+     * @param execTime The exec time of the project in milliseconds.
+     */
+    public BuildSuccess(MavenProject project, long wallTime, long execTime) {
+        super(project, wallTime, execTime);
     }
 }

maven-core/src/main/java/org/apache/maven/execution/BuildSummary.java

@@ -36,7 +36,12 @@ public abstract class BuildSummary {
     /**
      * The build time of the project in milliseconds.
      */
-    private final long time;
+    private final long wallTime;
+
+    /**
+     * The total amount of time spent for to run mojos in milliseconds.
+     */
+    private final long execTime;
 
     /**
      * Creates a new build summary for the specified project.
@@ -45,9 +50,21 @@ public abstract class BuildSummary {
      * @param time The build time of the project in milliseconds.
      */
     protected BuildSummary(MavenProject project, long time) {
+        this(project, time, time);
+    }
+
+    /**
+     * Creates a new build summary for the specified project.
+     *
+     * @param project The project being summarized, must not be {@code null}.
+     * @param execTime The exec time of the project in milliseconds.
+     * @param wallTime The wall time of the project in milliseconds.
+     */
+    protected BuildSummary(MavenProject project, long execTime, long wallTime) {
         this.project = Objects.requireNonNull(project, "project cannot be null");
         // TODO Validate for < 0?
-        this.time = time;
+        this.execTime = execTime;
+        this.wallTime = wallTime;
     }
 
     /**
@@ -60,11 +77,20 @@ public MavenProject getProject() {
     }
 
     /**
-     * Gets the build time of the project in milliseconds.
+     * Gets the wall time of the project in milliseconds.
      *
-     * @return The build time of the project in milliseconds.
+     * @return The wall time of the project in milliseconds.
      */
     public long getTime() {
-        return time;
+        return execTime;
+    }
+
+    /**
+     * Gets the exec time of the project in milliseconds.
+     *
+     * @return The exec time of the project in milliseconds.
+     */
+    public long getWallTime() {
+        return wallTime;
     }
 }

maven-core/src/main/java/org/apache/maven/lifecycle/internal/CompoundProjectExecutionListener.java

@@ -24,10 +24,10 @@
 import org.apache.maven.execution.ProjectExecutionListener;
 import org.apache.maven.lifecycle.LifecycleExecutionException;
 
-class CompoundProjectExecutionListener implements ProjectExecutionListener {
+public class CompoundProjectExecutionListener implements ProjectExecutionListener {
     private final Collection<ProjectExecutionListener> listeners;
 
-    CompoundProjectExecutionListener(Collection<ProjectExecutionListener> listeners) {
+    public CompoundProjectExecutionListener(Collection<ProjectExecutionListener> listeners) {
         this.listeners = listeners; // NB this is live injected collection
     }
 

maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoExecutor.java

@@ -214,6 +214,13 @@ private void execute(MavenSession session, MojoExecution mojoExecution, Dependen
         doExecute(session, mojoExecution, dependencyContext);
     }
 
+    protected static class NoLock implements NoExceptionCloseable {
+        public NoLock() {}
+
+        @Override
+        public void close() {}
+    }
+
     /**
      * Aggregating mojo executions (possibly) modify all MavenProjects, including those that are currently in use
      * by concurrently running mojo executions. To prevent race conditions, an aggregating execution will block
@@ -222,54 +229,45 @@ private void execute(MavenSession session, MojoExecution mojoExecution, Dependen
      * TODO: ideally, the builder should take care of the ordering in a smarter way
      * TODO: and concurrency issues fixed with MNG-7157
      */
-    private class ProjectLock implements AutoCloseable {
+    protected class ProjectLock implements NoExceptionCloseable {
         final Lock acquiredAggregatorLock;
         final OwnerReentrantLock acquiredProjectLock;
 
         ProjectLock(MavenSession session, MojoDescriptor mojoDescriptor) {
             mojos.put(Thread.currentThread(), mojoDescriptor);
-            if (session.getRequest().getDegreeOfConcurrency() > 1) {
-                boolean aggregator = mojoDescriptor.isAggregator();
-                acquiredAggregatorLock = aggregator ? aggregatorLock.writeLock() : aggregatorLock.readLock();
-                acquiredProjectLock = getProjectLock(session);
-                if (!acquiredAggregatorLock.tryLock()) {
-                    Thread owner = aggregatorLock.getOwner();
-                    MojoDescriptor ownerMojo = owner != null ? mojos.get(owner) : null;
-                    String str = ownerMojo != null ? " The " + ownerMojo.getId() : "An";
-                    String msg = str + " aggregator mojo is already being executed "
-                            + "in this parallel build, those kind of mojos require exclusive access to "
-                            + "reactor to prevent race conditions. This mojo execution will be blocked "
-                            + "until the aggregator mojo is done.";
-                    warn(msg);
-                    acquiredAggregatorLock.lock();
-                }
-                if (!acquiredProjectLock.tryLock()) {
-                    Thread owner = acquiredProjectLock.getOwner();
-                    MojoDescriptor ownerMojo = owner != null ? mojos.get(owner) : null;
-                    String str = ownerMojo != null ? " The " + ownerMojo.getId() : "A";
-                    String msg = str + " mojo is already being executed "
-                            + "on the project " + session.getCurrentProject().getGroupId()
-                            + ":" + session.getCurrentProject().getArtifactId() + ". "
-                            + "This mojo execution will be blocked "
-                            + "until the mojo is done.";
-                    warn(msg);
-                    acquiredProjectLock.lock();
-                }
-            } else {
-                acquiredAggregatorLock = null;
-                acquiredProjectLock = null;
+            boolean aggregator = mojoDescriptor.isAggregator();
+            acquiredAggregatorLock = aggregator ? aggregatorLock.writeLock() : aggregatorLock.readLock();
+            acquiredProjectLock = getProjectLock(session);
+            if (!acquiredAggregatorLock.tryLock()) {
+                Thread owner = aggregatorLock.getOwner();
+                MojoDescriptor ownerMojo = owner != null ? mojos.get(owner) : null;
+                String str = ownerMojo != null ? " The " + ownerMojo.getId() : "An";
+                String msg = str + " aggregator mojo is already being executed "
+                        + "in this parallel build, those kind of mojos require exclusive access to "
+                        + "reactor to prevent race conditions. This mojo execution will be blocked "
+                        + "until the aggregator mojo is done.";
+                warn(msg);
+                acquiredAggregatorLock.lock();
+            }
+            if (!acquiredProjectLock.tryLock()) {
+                Thread owner = acquiredProjectLock.getOwner();
+                MojoDescriptor ownerMojo = owner != null ? mojos.get(owner) : null;
+                String str = ownerMojo != null ? " The " + ownerMojo.getId() : "A";
+                String msg = str + " mojo is already being executed "
+                        + "on the project " + session.getCurrentProject().getGroupId()
+                        + ":" + session.getCurrentProject().getArtifactId() + ". "
+                        + "This mojo execution will be blocked "
+                        + "until the mojo is done.";
+                warn(msg);
+                acquiredProjectLock.lock();
             }
         }
 
         @Override
         public void close() {
             // release the lock in the reverse order of the acquisition
-            if (acquiredProjectLock != null) {
-                acquiredProjectLock.unlock();
-            }
-            if (acquiredAggregatorLock != null) {
-                acquiredAggregatorLock.unlock();
-            }
+            acquiredProjectLock.unlock();
+            acquiredAggregatorLock.unlock();
             mojos.remove(Thread.currentThread());
         }
 
@@ -308,7 +306,7 @@ private void doExecute(MavenSession session, MojoExecution mojoExecution, Depend
 
         ensureDependenciesAreResolved(mojoDescriptor, session, dependencyContext);
 
-        try (ProjectLock lock = new ProjectLock(session, mojoDescriptor)) {
+        try (NoExceptionCloseable lock = getProjectLock(session, mojoDescriptor)) {
             doExecute2(session, mojoExecution);
         } finally {
             for (MavenProject forkedProject : forkedProjects) {
@@ -317,6 +315,23 @@ private void doExecute(MavenSession session, MojoExecution mojoExecution, Depend
         }
     }
 
+    protected interface NoExceptionCloseable extends AutoCloseable {
+        @Override
+        void close();
+    }
+
+    protected NoExceptionCloseable getProjectLock(MavenSession session, MojoDescriptor mojoDescriptor) {
+        if (useProjectLock(session)) {
+            return new ProjectLock(session, mojoDescriptor);
+        } else {
+            return new NoLock();
+        }
+    }
+
+    protected boolean useProjectLock(MavenSession session) {
+        return session.getRequest().getDegreeOfConcurrency() > 1;
+    }
+
     private void doExecute2(MavenSession session, MojoExecution mojoExecution) throws LifecycleExecutionException {
         eventCatapult.fire(ExecutionEvent.Type.MojoStarted, session, mojoExecution);
         try {