Make LifecycleStarter pluggable (#1424)

maven-core/src/main/java/org/apache/maven/DefaultMaven.java

@@ -91,8 +91,6 @@ public class DefaultMaven implements Maven {
 
     private final Lookup lookup;
 
-    private final LifecycleStarter lifecycleStarter;
-
     private final ExecutionEventCatapult eventCatapult;
 
     private final LegacySupport legacySupport;
@@ -119,7 +117,6 @@ public class DefaultMaven implements Maven {
     @SuppressWarnings("checkstyle:ParameterNumber")
     public DefaultMaven(
             Lookup lookup,
-            LifecycleStarter lifecycleStarter,
             ExecutionEventCatapult eventCatapult,
             LegacySupport legacySupport,
             SessionScope sessionScope,
@@ -131,7 +128,6 @@ public class DefaultMaven implements Maven {
             DefaultSessionFactory defaultSessionFactory,
             @Nullable @Named("ide") WorkspaceReader ideWorkspaceReader) {
         this.lookup = lookup;
-        this.lifecycleStarter = lifecycleStarter;
         this.eventCatapult = eventCatapult;
         this.legacySupport = legacySupport;
         this.sessionScope = sessionScope;
@@ -309,6 +305,9 @@ public class DefaultMaven implements Maven {
 
             validateOptionalProfiles(session, request.getProfileActivation());
 
+            LifecycleStarter lifecycleStarter = lookup.lookupOptional(LifecycleStarter.class, request.getBuilderId())
+                    .orElseGet(() -> lookup.lookup(LifecycleStarter.class));
+
             lifecycleStarter.execute(session);
 
             validateOptionalProjects(request, session);

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

@@ -0,0 +1,139 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.maven.lifecycle.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.util.List;
+import java.util.Map;
+
+import org.apache.maven.execution.ExecutionEvent;
+import org.apache.maven.execution.MavenExecutionResult;
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.lifecycle.DefaultLifecycles;
+import org.apache.maven.lifecycle.MissingProjectException;
+import org.apache.maven.lifecycle.NoGoalSpecifiedException;
+import org.apache.maven.lifecycle.internal.builder.Builder;
+import org.apache.maven.lifecycle.internal.builder.BuilderNotFoundException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Starts the build life cycle
+ *
+ */
+@Named
+@Singleton
+public class DefaultLifecycleStarter implements LifecycleStarter {
+    private final Logger logger = LoggerFactory.getLogger(getClass());
+
+    private final ExecutionEventCatapult eventCatapult;
+
+    private final DefaultLifecycles defaultLifeCycles;
+
+    private final BuildListCalculator buildListCalculator;
+
+    private final LifecycleDebugLogger lifecycleDebugLogger;
+
+    private final LifecycleTaskSegmentCalculator lifecycleTaskSegmentCalculator;
+
+    private final Map<String, Builder> builders;
+
+    @Inject
+    public DefaultLifecycleStarter(
+            ExecutionEventCatapult eventCatapult,
+            DefaultLifecycles defaultLifeCycles,
+            BuildListCalculator buildListCalculator,
+            LifecycleDebugLogger lifecycleDebugLogger,
+            LifecycleTaskSegmentCalculator lifecycleTaskSegmentCalculator,
+            Map<String, Builder> builders) {
+        this.eventCatapult = eventCatapult;
+        this.defaultLifeCycles = defaultLifeCycles;
+        this.buildListCalculator = buildListCalculator;
+        this.lifecycleDebugLogger = lifecycleDebugLogger;
+        this.lifecycleTaskSegmentCalculator = lifecycleTaskSegmentCalculator;
+        this.builders = builders;
+    }
+
+    @Override
+    public void execute(MavenSession session) {
+        eventCatapult.fire(ExecutionEvent.Type.SessionStarted, session, null);
+
+        ReactorContext reactorContext = null;
+        ProjectBuildList projectBuilds = null;
+        MavenExecutionResult result = session.getResult();
+
+        try {
+            if (buildExecutionRequiresProject(session) && projectIsNotPresent(session)) {
+                throw new MissingProjectException("The goal you specified requires a project to execute"
+                        + " but there is no POM in this directory (" + session.getExecutionRootDirectory() + ")."
+                        + " Please verify you invoked Maven from the correct directory.");
+            }
+
+            List<TaskSegment> taskSegments = lifecycleTaskSegmentCalculator.calculateTaskSegments(session);
+            projectBuilds = buildListCalculator.calculateProjectBuilds(session, taskSegments);
+
+            if (projectBuilds.isEmpty()) {
+                throw new NoGoalSpecifiedException("No goals have been specified for this build."
+                        + " You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or"
+                        + " <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>."
+                        + " Available lifecycle phases are: " + defaultLifeCycles.getLifecyclePhaseList() + ".");
+            }
+
+            if (logger.isDebugEnabled()) {
+                lifecycleDebugLogger.debugReactorPlan(projectBuilds);
+            }
+
+            ClassLoader oldContextClassLoader = Thread.currentThread().getContextClassLoader();
+            ReactorBuildStatus reactorBuildStatus = new ReactorBuildStatus(session.getProjectDependencyGraph());
+            reactorContext = new ReactorContext(result, oldContextClassLoader, reactorBuildStatus);
+
+            String builderId = session.getRequest().getBuilderId();
+            Builder builder = builders.get(builderId);
+            if (builder == null) {
+                throw new BuilderNotFoundException(
+                        String.format("The builder requested using id = %s cannot be" + " found", builderId));
+            }
+
+            int degreeOfConcurrency = session.getRequest().getDegreeOfConcurrency();
+            if (degreeOfConcurrency > 1) {
+                logger.info("");
+                logger.info(String.format(
+                        "Using the %s implementation with a thread count of %d",
+                        builder.getClass().getSimpleName(), degreeOfConcurrency));
+            }
+            builder.build(session, reactorContext, projectBuilds, taskSegments, reactorBuildStatus);
+
+        } catch (Exception e) {
+            result.addException(e);
+        } finally {
+            eventCatapult.fire(ExecutionEvent.Type.SessionEnded, session, null);
+        }
+    }
+
+    private boolean buildExecutionRequiresProject(MavenSession session) {
+        return lifecycleTaskSegmentCalculator.requiresProject(session);
+    }
+
+    private boolean projectIsNotPresent(MavenSession session) {
+        return !session.getRequest().isProjectPresent();
+    }
+}

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

@@ -18,125 +18,13 @@
  */
 package org.apache.maven.lifecycle.internal;
 
-import javax.inject.Inject;
-import javax.inject.Named;
-import javax.inject.Singleton;
-
-import java.util.List;
-import java.util.Map;
-
-import org.apache.maven.execution.ExecutionEvent;
-import org.apache.maven.execution.MavenExecutionResult;
 import org.apache.maven.execution.MavenSession;
-import org.apache.maven.lifecycle.DefaultLifecycles;
-import org.apache.maven.lifecycle.MissingProjectException;
-import org.apache.maven.lifecycle.NoGoalSpecifiedException;
-import org.apache.maven.lifecycle.internal.builder.Builder;
-import org.apache.maven.lifecycle.internal.builder.BuilderNotFoundException;
-import org.apache.maven.session.scope.internal.SessionScope;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Starts the build life cycle
  *
  */
-@Named
+public interface LifecycleStarter {
-@Singleton
-public class LifecycleStarter {
-    private final Logger logger = LoggerFactory.getLogger(getClass());
 
-    private final ExecutionEventCatapult eventCatapult;
+    void execute(MavenSession session);
-
-    private final DefaultLifecycles defaultLifeCycles;
-
-    private final BuildListCalculator buildListCalculator;
-
-    private final LifecycleDebugLogger lifecycleDebugLogger;
-
-    private final LifecycleTaskSegmentCalculator lifecycleTaskSegmentCalculator;
-
-    private final Map<String, Builder> builders;
-
-    @Inject
-    public LifecycleStarter(
-            ExecutionEventCatapult eventCatapult,
-            DefaultLifecycles defaultLifeCycles,
-            BuildListCalculator buildListCalculator,
-            LifecycleDebugLogger lifecycleDebugLogger,
-            LifecycleTaskSegmentCalculator lifecycleTaskSegmentCalculator,
-            Map<String, Builder> builders,
-            SessionScope sessionScope) {
-        this.eventCatapult = eventCatapult;
-        this.defaultLifeCycles = defaultLifeCycles;
-        this.buildListCalculator = buildListCalculator;
-        this.lifecycleDebugLogger = lifecycleDebugLogger;
-        this.lifecycleTaskSegmentCalculator = lifecycleTaskSegmentCalculator;
-        this.builders = builders;
-    }
-
-    public void execute(MavenSession session) {
-        eventCatapult.fire(ExecutionEvent.Type.SessionStarted, session, null);
-
-        ReactorContext reactorContext = null;
-        ProjectBuildList projectBuilds = null;
-        MavenExecutionResult result = session.getResult();
-
-        try {
-            if (buildExecutionRequiresProject(session) && projectIsNotPresent(session)) {
-                throw new MissingProjectException("The goal you specified requires a project to execute"
-                        + " but there is no POM in this directory (" + session.getExecutionRootDirectory() + ")."
-                        + " Please verify you invoked Maven from the correct directory.");
-            }
-
-            List<TaskSegment> taskSegments = lifecycleTaskSegmentCalculator.calculateTaskSegments(session);
-            projectBuilds = buildListCalculator.calculateProjectBuilds(session, taskSegments);
-
-            if (projectBuilds.isEmpty()) {
-                throw new NoGoalSpecifiedException("No goals have been specified for this build."
-                        + " You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or"
-                        + " <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>."
-                        + " Available lifecycle phases are: " + defaultLifeCycles.getLifecyclePhaseList() + ".");
-            }
-
-            ProjectIndex projectIndex = new ProjectIndex(session.getProjects());
-
-            if (logger.isDebugEnabled()) {
-                lifecycleDebugLogger.debugReactorPlan(projectBuilds);
-            }
-
-            ClassLoader oldContextClassLoader = Thread.currentThread().getContextClassLoader();
-            ReactorBuildStatus reactorBuildStatus = new ReactorBuildStatus(session.getProjectDependencyGraph());
-            reactorContext = new ReactorContext(result, oldContextClassLoader, reactorBuildStatus);
-
-            String builderId = session.getRequest().getBuilderId();
-            Builder builder = builders.get(builderId);
-            if (builder == null) {
-                throw new BuilderNotFoundException(
-                        String.format("The builder requested using id = %s cannot be" + " found", builderId));
-            }
-
-            int degreeOfConcurrency = session.getRequest().getDegreeOfConcurrency();
-            if (degreeOfConcurrency > 1) {
-                logger.info("");
-                logger.info(String.format(
-                        "Using the %s implementation with a thread count of %d",
-                        builder.getClass().getSimpleName(), degreeOfConcurrency));
-            }
-            builder.build(session, reactorContext, projectBuilds, taskSegments, reactorBuildStatus);
-
-        } catch (Exception e) {
-            result.addException(e);
-        } finally {
-            eventCatapult.fire(ExecutionEvent.Type.SessionEnded, session, null);
-        }
-    }
-
-    private boolean buildExecutionRequiresProject(MavenSession session) {
-        return lifecycleTaskSegmentCalculator.requiresProject(session);
-    }
-
-    private boolean projectIsNotPresent(MavenSession session) {
-        return !session.getRequest().isProjectPresent();
-    }
 }