Fix #40 Cannot clean on Windows as long as mvnd keeps a plugin from the tree loaded

daemon/src/main/java/org/apache/maven/cli/DaemonMavenCli.java

@@ -416,13 +416,14 @@ public class DaemonMavenCli {
         //        }
 
         final CoreExports exports = new CoreExports(containerRealm, exportedArtifacts, exportedPackages);
+        final CliPluginRealmCache realmCache = new CliPluginRealmCache();
 
         container = new DefaultPlexusContainer(cc, new AbstractModule() {
             @Override
             protected void configure() {
                 bind(ILoggerFactory.class).toInstance(slf4jLoggerFactory);
                 bind(CoreExports.class).toInstance(exports);
-                bind(PluginRealmCache.class).toInstance(new CliPluginRealmCache());
+                bind(PluginRealmCache.class).toInstance(realmCache);
             }
         });
 
@@ -440,6 +441,7 @@ public class DaemonMavenCli {
         //        container.getLoggerManager().setThresholds( cliRequest.request.getLoggingLevel() );
 
         eventSpyDispatcher = container.lookup(EventSpyDispatcher.class);
+        eventSpyDispatcher.getEventSpies().add(realmCache.asEventSpy());
 
         maven = container.lookup(Maven.class);
 

daemon/src/main/java/org/jboss/fuse/mvnd/plugin/CliPluginRealmCache.java

@@ -20,9 +20,12 @@ package org.jboss.fuse.mvnd.plugin;
 
 import java.io.File;
 import java.io.IOException;
+import java.net.URISyntaxException;
+import java.net.URL;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.nio.file.StandardWatchEventKinds;
 import java.nio.file.WatchEvent;
 import java.nio.file.WatchEvent.Kind;
@@ -32,6 +35,7 @@ import java.nio.file.attribute.BasicFileAttributes;
 import java.nio.file.attribute.FileTime;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -45,6 +49,9 @@ import javax.inject.Named;
 import javax.inject.Singleton;
 import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.Artifact;
+import org.apache.maven.eventspy.EventSpy;
+import org.apache.maven.execution.MavenExecutionRequest;
+import org.apache.maven.execution.MavenExecutionResult;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.PluginRealmCache;
 import org.apache.maven.project.MavenProject;
@@ -427,6 +434,51 @@ public class CliPluginRealmCache
     private static final Logger log = LoggerFactory.getLogger(CliPluginRealmCache.class);
     protected final Map<Key, ValidableCacheRecord> cache = new ConcurrentHashMap<>();
     private final RecordValidator watcher;
+    private final EventSpy eventSpy = new EventSpy() {
+
+        private Path multiModuleProjectDirectory;
+
+        @Override
+        public void onEvent(Object event) throws Exception {
+            try {
+                if (event instanceof MavenExecutionRequest) {
+                    /*  Store the multiModuleProjectDirectory path */
+                    multiModuleProjectDirectory = ((MavenExecutionRequest) event).getMultiModuleProjectDirectory().toPath()
+                            .toRealPath();
+                } else if (event instanceof MavenExecutionResult) {
+                    /* Evict the entries refering to jars under multiModuleProjectDirectory */
+                    final Iterator<Entry<Key, ValidableCacheRecord>> i = cache.entrySet().iterator();
+                    while (i.hasNext()) {
+                        final Entry<Key, ValidableCacheRecord> entry = i.next();
+                        final ValidableCacheRecord record = entry.getValue();
+                        for (URL url : record.getRealm().getURLs()) {
+                            if (url.getProtocol().equals("file")) {
+                                final Path path = Paths.get(url.toURI()).toRealPath();
+                                if (path.startsWith(multiModuleProjectDirectory)) {
+                                    log.debug(
+                                            "Removing PluginRealmCache entry {} because it refers to an artifact in the build tree {}",
+                                            entry.getKey(), path);
+                                    record.dispose();
+                                    i.remove();
+                                    break;
+                                }
+                            }
+                        }
+                    }
+                }
+            } catch (Exception e) {
+                log.warn("Could not notify CliPluginRealmCache", e);
+            }
+        }
+
+        @Override
+        public void init(Context context) throws Exception {
+        }
+
+        @Override
+        public void close() throws Exception {
+        }
+    };
 
     public CliPluginRealmCache() {
         this.watcher = System.getProperty("os.name").toLowerCase().contains("mac")
@@ -488,4 +540,8 @@ public class CliPluginRealmCache
         flush();
     }
 
+    public EventSpy asEventSpy() {
+        return eventSpy;
+    }
+
 }

integration-tests/src/test/java/org/jboss/fuse/mvnd/it/ModuleAndPluginNativeIT.java

@@ -74,7 +74,7 @@ public class ModuleAndPluginNativeIT {
 
             final ClientOutput output = Mockito.mock(ClientOutput.class);
             client.execute(output,
-                    // "clean", workaround for https://github.com/mvndaemon/mvnd/issues/40
+                    "clean",
                     "install", "-e", "-Dmvnd.log.level=DEBUG").assertSuccess();
 
             Assertions.assertThat(helloPath).exists();