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19 package org.apache.maven.lifecycle.internal.builder.multithreaded;
20
21 import java.util.List;
22 import java.util.Map;
23 import java.util.Set;
24 import java.util.concurrent.Callable;
25 import java.util.concurrent.CompletionService;
26 import java.util.concurrent.ExecutionException;
27 import java.util.concurrent.ExecutorCompletionService;
28 import java.util.concurrent.ExecutorService;
29 import java.util.concurrent.Executors;
30 import java.util.concurrent.TimeUnit;
31 import java.util.function.Function;
32 import java.util.stream.Collectors;
33 import javax.inject.Inject;
34 import javax.inject.Named;
35 import javax.inject.Singleton;
36 import org.apache.maven.execution.MavenSession;
37 import org.apache.maven.lifecycle.internal.BuildThreadFactory;
38 import org.apache.maven.lifecycle.internal.LifecycleModuleBuilder;
39 import org.apache.maven.lifecycle.internal.ProjectBuildList;
40 import org.apache.maven.lifecycle.internal.ProjectSegment;
41 import org.apache.maven.lifecycle.internal.ReactorBuildStatus;
42 import org.apache.maven.lifecycle.internal.ReactorContext;
43 import org.apache.maven.lifecycle.internal.TaskSegment;
44 import org.apache.maven.lifecycle.internal.builder.Builder;
45 import org.apache.maven.project.MavenProject;
46 import org.slf4j.Logger;
47 import org.slf4j.LoggerFactory;
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62
63 @Named("multithreaded")
64 @Singleton
65 public class MultiThreadedBuilder implements Builder {
66 private final Logger logger = LoggerFactory.getLogger(getClass());
67
68 private final LifecycleModuleBuilder lifecycleModuleBuilder;
69
70 @Inject
71 public MultiThreadedBuilder(LifecycleModuleBuilder lifecycleModuleBuilder) {
72 this.lifecycleModuleBuilder = lifecycleModuleBuilder;
73 }
74
75 @Override
76 public void build(
77 MavenSession session,
78 ReactorContext reactorContext,
79 ProjectBuildList projectBuilds,
80 List<TaskSegment> taskSegments,
81 ReactorBuildStatus reactorBuildStatus)
82 throws ExecutionException, InterruptedException {
83 int nThreads = Math.min(
84 session.getRequest().getDegreeOfConcurrency(),
85 session.getProjects().size());
86 boolean parallel = nThreads > 1;
87
88 session.setParallel(parallel);
89 for (ProjectSegment segment : projectBuilds) {
90 segment.getSession().setParallel(parallel);
91 }
92 ExecutorService executor = Executors.newFixedThreadPool(nThreads, new BuildThreadFactory());
93 CompletionService<ProjectSegment> service = new ExecutorCompletionService<>(executor);
94
95
96 ThreadOutputMuxer muxer = null;
97
98 for (TaskSegment taskSegment : taskSegments) {
99 ProjectBuildList segmentProjectBuilds = projectBuilds.getByTaskSegment(taskSegment);
100 Map<MavenProject, ProjectSegment> projectBuildMap = projectBuilds.selectSegment(taskSegment);
101 try {
102 ConcurrencyDependencyGraph analyzer =
103 new ConcurrencyDependencyGraph(segmentProjectBuilds, session.getProjectDependencyGraph());
104 multiThreadedProjectTaskSegmentBuild(
105 analyzer, reactorContext, session, service, taskSegment, projectBuildMap, muxer);
106 if (reactorContext.getReactorBuildStatus().isHalted()) {
107 break;
108 }
109 } catch (Exception e) {
110 session.getResult().addException(e);
111 break;
112 }
113 }
114
115 executor.shutdown();
116 executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
117 }
118
119 private void multiThreadedProjectTaskSegmentBuild(
120 ConcurrencyDependencyGraph analyzer,
121 ReactorContext reactorContext,
122 MavenSession rootSession,
123 CompletionService<ProjectSegment> service,
124 TaskSegment taskSegment,
125 Map<MavenProject, ProjectSegment> projectBuildList,
126 ThreadOutputMuxer muxer) {
127
128 Set<String> duplicateArtifactIds = projectBuildList.keySet().stream()
129 .map(MavenProject::getArtifactId)
130 .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
131 .entrySet()
132 .stream()
133 .filter(p -> p.getValue() > 1)
134 .map(Map.Entry::getKey)
135 .collect(Collectors.toSet());
136
137
138 for (MavenProject mavenProject : analyzer.getRootSchedulableBuilds()) {
139 ProjectSegment projectSegment = projectBuildList.get(mavenProject);
140 logger.debug("Scheduling: " + projectSegment.getProject());
141 Callable<ProjectSegment> cb = createBuildCallable(
142 rootSession, projectSegment, reactorContext, taskSegment, muxer, duplicateArtifactIds);
143 service.submit(cb);
144 }
145
146
147 for (int i = 0; i < analyzer.getNumberOfBuilds(); i++) {
148 try {
149 ProjectSegment projectBuild = service.take().get();
150 if (reactorContext.getReactorBuildStatus().isHalted()) {
151 break;
152 }
153
154
155 if (analyzer.getNumberOfBuilds() > 1) {
156 final List<MavenProject> newItemsThatCanBeBuilt =
157 analyzer.markAsFinished(projectBuild.getProject());
158 for (MavenProject mavenProject : newItemsThatCanBeBuilt) {
159 ProjectSegment scheduledDependent = projectBuildList.get(mavenProject);
160 logger.debug("Scheduling: " + scheduledDependent);
161 Callable<ProjectSegment> cb = createBuildCallable(
162 rootSession,
163 scheduledDependent,
164 reactorContext,
165 taskSegment,
166 muxer,
167 duplicateArtifactIds);
168 service.submit(cb);
169 }
170 }
171 } catch (InterruptedException e) {
172 rootSession.getResult().addException(e);
173 break;
174 } catch (ExecutionException e) {
175
176 rootSession.getResult().addException(e);
177 break;
178 }
179 }
180 }
181
182 private Callable<ProjectSegment> createBuildCallable(
183 final MavenSession rootSession,
184 final ProjectSegment projectBuild,
185 final ReactorContext reactorContext,
186 final TaskSegment taskSegment,
187 final ThreadOutputMuxer muxer,
188 final Set<String> duplicateArtifactIds) {
189 return () -> {
190 final Thread currentThread = Thread.currentThread();
191 final String originalThreadName = currentThread.getName();
192 final MavenProject project = projectBuild.getProject();
193
194 final String threadNameSuffix = duplicateArtifactIds.contains(project.getArtifactId())
195 ? project.getGroupId() + ":" + project.getArtifactId()
196 : project.getArtifactId();
197 currentThread.setName("mvn-builder-" + threadNameSuffix);
198
199 try {
200
201 lifecycleModuleBuilder.buildProject(
202 projectBuild.getSession(), rootSession, reactorContext, project, taskSegment);
203
204
205 return projectBuild;
206 } finally {
207 currentThread.setName(originalThreadName);
208 }
209 };
210 }
211 }