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