maven-core/src/main/java/org/apache/maven/lifecycle/internal/builder/singlethreaded/SingleThreadedBuilder.java

package org.apache.maven.lifecycle.internal.builder.singlethreaded;

/*
 * 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.
 */

import java.util.List;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.internal.LifecycleModuleBuilder;
import org.apache.maven.lifecycle.internal.ProjectBuildList;
import org.apache.maven.lifecycle.internal.ProjectSegment;
import org.apache.maven.lifecycle.internal.ReactorBuildStatus;
import org.apache.maven.lifecycle.internal.ReactorContext;
import org.apache.maven.lifecycle.internal.TaskSegment;
import org.apache.maven.lifecycle.internal.builder.Builder;

/**
 * <p>
 * A {@link Builder} encapsulates a strategy for building a set of Maven projects. The default strategy in Maven builds
 * the the projects serially, but a {@link Builder} can employ any type of concurrency model to build the projects.
 */
@Named( "singlethreaded" )
@Singleton
public class SingleThreadedBuilder
    implements Builder
{
    private final LifecycleModuleBuilder lifecycleModuleBuilder;

    @Inject
    public SingleThreadedBuilder( LifecycleModuleBuilder lifecycleModuleBuilder )
    {
        this.lifecycleModuleBuilder = lifecycleModuleBuilder;
    }

    public void build( MavenSession session, ReactorContext reactorContext, ProjectBuildList projectBuilds,
                       List<TaskSegment> taskSegments, ReactorBuildStatus reactorBuildStatus )
    {
        for ( TaskSegment taskSegment : taskSegments )
        {
            for ( ProjectSegment projectBuild : projectBuilds.getByTaskSegment( taskSegment ) )
            {
                try
                {
                    lifecycleModuleBuilder.buildProject( session, reactorContext, projectBuild.getProject(),
                                                         taskSegment );
                    if ( reactorBuildStatus.isHalted() )
                    {
                        break;
                    }
                }
                catch ( Exception e )
                {
                    break; // Why are we just ignoring this exception? Are exceptions are being used for flow control
                }
            }
        }
    }
}