Plugin System

public interface MavenPluginManager {
    /**
     * Get plugin descriptor for a plugin.
     *
     * @param plugin the plugin to get descriptor for
     * @param repositories list of repositories to search
     * @param session repository system session
     * @return plugin descriptor containing plugin metadata
     * @throws PluginDescriptorParsingException if descriptor parsing fails
     * @throws InvalidPluginDescriptorException if descriptor is invalid
     */
    PluginDescriptor getPluginDescriptor(Plugin plugin, List<RemoteRepository> repositories,
        RepositorySystemSession session) throws PluginDescriptorParsingException, InvalidPluginDescriptorException;
    
    /**
     * Setup plugin classloader realm.
     *
     * @param pluginDescriptor plugin metadata
     * @param session Maven session
     * @param parent parent classloader
     * @param imports list of package imports to expose
     * @param filter dependency filter for plugin dependencies
     * @return configured class realm for plugin
     * @throws PluginManagerException if realm setup fails
     */
    ClassRealm setupPluginRealm(PluginDescriptor pluginDescriptor, MavenSession session,
        ClassLoader parent, List<String> imports, DependencyFilter filter) throws PluginManagerException;
    
    /**
     * Get configured Mojo instance.
     *
     * @param mojoInterface the Mojo interface class
     * @param session Maven session
     * @param mojoExecution mojo execution descriptor
     * @return configured Mojo instance ready for execution
     * @throws PluginConfigurationException if configuration fails
     * @throws PluginContainerException if container operations fail
     */
    <T> T getConfiguredMojo(Class<T> mojoInterface, MavenSession session, MojoExecution mojoExecution)
        throws PluginConfigurationException, PluginContainerException;
    
    /**
     * Release Mojo resources.
     *
     * @param mojo the mojo instance to release
     * @param mojoExecution mojo execution descriptor
     * @param session Maven session
     */
    void releaseMojo(Object mojo, MojoExecution mojoExecution, MavenSession session);
    
    /**
     * Extract plugin artifacts for dependency resolution.
     *
     * @param plugin the plugin
     * @param artifact the plugin artifact
     * @param session Maven session
     * @return plugin artifact resolution result
     * @throws PluginResolutionException if resolution fails
     */
    PluginArtifactsResult resolvePluginArtifacts(Plugin plugin, Artifact artifact, MavenSession session)
        throws PluginResolutionException;
}

public interface BuildPluginManager {
    /**
     * Load plugin for execution.
     *
     * @param plugin plugin configuration
     * @param repositories list of plugin repositories
     * @param session repository system session
     * @return loaded plugin descriptor
     * @throws PluginNotFoundException if plugin cannot be found
     * @throws PluginResolutionException if plugin resolution fails
     */
    PluginDescriptor loadPlugin(Plugin plugin, List<RemoteRepository> repositories,
        RepositorySystemSession session) throws PluginNotFoundException, PluginResolutionException;
    
    /**
     * Execute a Mojo.
     *
     * @param session Maven session
     * @param execution mojo execution configuration
     * @throws MojoFailureException if mojo execution fails
     * @throws MojoExecutionException if mojo execution encounters error
     * @throws PluginConfigurationException if plugin configuration is invalid
     * @throws PluginManagerException if plugin management fails
     */
    void executeMojo(MavenSession session, MojoExecution execution) 
        throws MojoFailureException, MojoExecutionException, PluginConfigurationException, PluginManagerException;
    
    /**
     * Get plugin classloader realm.
     *
     * @param session Maven session
     * @param pluginDescriptor plugin metadata
     * @return plugin class realm
     * @throws PluginManagerException if realm access fails
     */
    ClassRealm getPluginRealm(MavenSession session, PluginDescriptor pluginDescriptor) throws PluginManagerException;
}

import org.apache.maven.plugin.MavenPluginManager;
import org.apache.maven.plugin.BuildPluginManager;
import org.apache.maven.plugin.PluginDescriptor;
import org.apache.maven.plugin.MojoExecution;

@Component
private MavenPluginManager pluginManager;

@Component 
private BuildPluginManager buildPluginManager;

public void executeCustomPlugin(MavenSession session) throws Exception {
    // Create plugin reference
    Plugin plugin = new Plugin();
    plugin.setGroupId("org.apache.maven.plugins");
    plugin.setArtifactId("maven-compiler-plugin");
    plugin.setVersion("3.11.0");
    
    // Load plugin
    PluginDescriptor pluginDescriptor = buildPluginManager.loadPlugin(
        plugin, session.getCurrentProject().getPluginArtifactRepositories(),
        session.getRepositorySession());
    
    // Create mojo execution
    MojoExecution execution = new MojoExecution(pluginDescriptor.getMojo("compile"));
    execution.setLifecyclePhase("compile");
    
    // Configure execution
    Xpp3Dom configuration = new Xpp3Dom("configuration");
    Xpp3Dom source = new Xpp3Dom("source");
    source.setValue("17");
    configuration.addChild(source);
    Xpp3Dom target = new Xpp3Dom("target");
    target.setValue("17");
    configuration.addChild(target);
    execution.setConfiguration(configuration);
    
    // Execute mojo
    buildPluginManager.executeMojo(session, execution);
    
    System.out.println("Plugin executed successfully: " + 
                      pluginDescriptor.getGroupId() + ":" +
                      pluginDescriptor.getArtifactId() + ":" +
                      pluginDescriptor.getVersion());
}

public class MojoExecution {
    /**
     * Create mojo execution for a mojo descriptor.
     *
     * @param mojoDescriptor the mojo to execute
     */
    public MojoExecution(MojoDescriptor mojoDescriptor);
    
    /**
     * Create mojo execution with execution ID.
     *
     * @param mojoDescriptor the mojo to execute
     * @param executionId unique execution identifier
     */
    public MojoExecution(MojoDescriptor mojoDescriptor, String executionId);
    
    /**
     * Create mojo execution with configuration.
     *
     * @param mojoDescriptor the mojo to execute
     * @param configuration mojo configuration
     */
    public MojoExecution(MojoDescriptor mojoDescriptor, PlexusConfiguration configuration);
    
    // Execution Identity
    public String getExecutionId();
    public void setExecutionId(String executionId);
    
    // Plugin Information
    public Plugin getPlugin();
    public void setPlugin(Plugin plugin);
    
    // Goal Information  
    public String getGoal();
    public void setGoal(String goal);
    
    // Lifecycle Information
    public String getLifecyclePhase();
    public void setLifecyclePhase(String lifecyclePhase);
    
    // Mojo Descriptor
    public MojoDescriptor getMojoDescriptor();
    public void setMojoDescriptor(MojoDescriptor mojoDescriptor);
    
    // Configuration
    public PlexusConfiguration getConfiguration();
    public void setConfiguration(PlexusConfiguration configuration);
    
    // Source Location
    public InputLocation getLocation(Object key);
    public void setLocation(Object key, InputLocation location);
    
    // String representation
    public String toString();
    public String identify();
}

import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;

public MojoExecution createCompilerExecution() {
    // Get mojo descriptor (typically from plugin descriptor)
    MojoDescriptor compilerMojo = pluginDescriptor.getMojo("compile");
    
    // Create execution
    MojoExecution execution = new MojoExecution(compilerMojo, "default-compile");
    execution.setLifecyclePhase("compile");
    
    // Configure mojo parameters
    Xpp3Dom config = new Xpp3Dom("configuration");
    
    Xpp3Dom source = new Xpp3Dom("source");
    source.setValue("17");
    config.addChild(source);
    
    Xpp3Dom target = new Xpp3Dom("target");
    target.setValue("17");
    config.addChild(target);
    
    Xpp3Dom encoding = new Xpp3Dom("encoding");
    encoding.setValue("UTF-8");
    config.addChild(encoding);
    
    execution.setConfiguration(new XmlPlexusConfiguration(config));
    
    return execution;
}

// Execute with build plugin manager
public void executeCompilation(MavenSession session, MojoExecution execution) throws Exception {
    try {
        buildPluginManager.executeMojo(session, execution);
        System.out.println("Compilation successful");
    } catch (MojoFailureException e) {
        System.err.println("Compilation failed: " + e.getMessage());
        throw e;
    } catch (MojoExecutionException e) {
        System.err.println("Compilation error: " + e.getMessage());
        throw e;
    }
}

public interface PluginRealmCache {
    /**
     * Cache key for plugin realm entries.
     */
    interface Key {
        // Key implementation details
    }
    
    /**
     * Cached plugin realm record.
     */
    class CacheRecord {
        public ClassRealm getRealm();
        public List<Artifact> getArtifacts();
        public List<ComponentDescriptor<?>> getComponentDescriptors();
    }
    
    /**
     * Get cached plugin realm.
     *
     * @param key cache key for the plugin
     * @return cached realm record or null if not cached
     */
    CacheRecord get(Key key);
    
    /**
     * Put plugin realm in cache.
     *
     * @param key cache key
     * @param record realm record to cache
     * @return previous cached record or null
     */
    CacheRecord put(Key key, CacheRecord record);
    
    /**
     * Remove plugin realm from cache.
     *
     * @param key cache key
     * @return removed record or null if not present
     */
    CacheRecord remove(Key key);
    
    /**
     * Clear all cached plugin realms.
     */
    void clear();
    
    /**
     * Register cache cleanup callback.
     *
     * @param record realm record to monitor
     * @param callback cleanup callback
     */
    void register(MavenProject project, Key key, CacheRecord record, CacheCleanupCallback callback);
}

public interface PluginDescriptorCache {
    /**
     * Cache key for plugin descriptors.
     */
    interface Key {
        // Key implementation details
    }
    
    /**
     * Get cached plugin descriptor.
     *
     * @param key cache key
     * @return cached plugin descriptor or null if not cached
     */
    PluginDescriptor get(Key key);
    
    /**
     * Put plugin descriptor in cache.
     *
     * @param key cache key
     * @param descriptor plugin descriptor to cache
     * @return previous cached descriptor or null
     */
    PluginDescriptor put(Key key, PluginDescriptor descriptor);
    
    /**
     * Remove plugin descriptor from cache.
     *
     * @param key cache key  
     * @return removed descriptor or null if not present
     */
    PluginDescriptor remove(Key key);
    
    /**
     * Clear all cached plugin descriptors.
     */
    void clear();
}

public interface PluginArtifactsCache {
    /**
     * Cache key for plugin artifacts.
     */
    interface Key {
        // Key implementation details  
    }
    
    /**
     * Get cached plugin artifacts.
     *
     * @param key cache key
     * @return cached artifacts or null if not cached
     */
    PluginArtifactsResult get(Key key);
    
    /**
     * Put plugin artifacts in cache.
     *
     * @param key cache key
     * @param result artifacts result to cache
     * @return previous cached result or null
     */
    PluginArtifactsResult put(Key key, PluginArtifactsResult result);
    
    /**
     * Remove plugin artifacts from cache.
     *
     * @param key cache key
     * @return removed result or null if not present  
     */
    PluginArtifactsResult remove(Key key);
    
    /**
     * Clear all cached plugin artifacts.
     */
    void clear();
}

import org.apache.maven.plugin.PluginRealmCache;
import org.apache.maven.plugin.PluginDescriptorCache;

@Component
private PluginRealmCache realmCache;

@Component
private PluginDescriptorCache descriptorCache;

public PluginDescriptor getCachedPluginDescriptor(Plugin plugin, RepositorySystemSession session) {
    // Create cache key (implementation specific)
    PluginDescriptorCache.Key key = createDescriptorKey(plugin, session);
    
    // Try cache first
    PluginDescriptor descriptor = descriptorCache.get(key);
    if (descriptor != null) {
        System.out.println("Plugin descriptor found in cache");
        return descriptor;
    }
    
    // Load and cache descriptor
    try {
        descriptor = pluginManager.getPluginDescriptor(plugin, repositories, session);
        descriptorCache.put(key, descriptor);
        System.out.println("Plugin descriptor loaded and cached");
        return descriptor;
    } catch (Exception e) {
        System.err.println("Failed to load plugin descriptor: " + e.getMessage());
        throw new RuntimeException(e);
    }
}

public ClassRealm getCachedPluginRealm(PluginDescriptor descriptor, MavenSession session) {
    // Create cache key
    PluginRealmCache.Key key = createRealmKey(descriptor, session);
    
    // Check cache
    PluginRealmCache.CacheRecord record = realmCache.get(key);
    if (record != null) {
        System.out.println("Plugin realm found in cache");
        return record.getRealm();
    }
    
    // Setup and cache realm
    try {
        ClassRealm realm = pluginManager.setupPluginRealm(descriptor, session, null, null, null);
        
        PluginRealmCache.CacheRecord newRecord = new PluginRealmCache.CacheRecord();
        // Set record properties...
        
        realmCache.put(key, newRecord);
        System.out.println("Plugin realm created and cached");
        return realm;
    } catch (Exception e) {
        System.err.println("Failed to setup plugin realm: " + e.getMessage());
        throw new RuntimeException(e);
    }
}

public interface PluginPrefixResolver {
    /**
     * Resolve plugin prefix to plugin coordinates.
     *
     * @param prefix plugin prefix (e.g., "compiler", "surefire")
     * @param pluginGroups list of plugin groups to search
     * @param session repository system session
     * @return plugin prefix resolution result
     * @throws PluginPrefixResolutionException if resolution fails
     */
    PluginPrefixResult resolve(String prefix, List<String> pluginGroups,
        RepositorySystemSession session) throws PluginPrefixResolutionException;
}

public interface PluginVersionResolver {
    /**
     * Resolve plugin version.
     *
     * @param request plugin version resolution request
     * @return plugin version resolution result
     * @throws PluginVersionResolutionException if resolution fails
     */
    PluginVersionResult resolve(PluginVersionRequest request) throws PluginVersionResolutionException;
}

import org.apache.maven.plugin.prefix.PluginPrefixResolver;
import org.apache.maven.plugin.version.PluginVersionResolver;

@Component
private PluginPrefixResolver prefixResolver;

@Component
private PluginVersionResolver versionResolver;

public Plugin resolvePluginFromPrefix(String prefix, MavenSession session) throws Exception {
    // Resolve prefix to coordinates
    List<String> pluginGroups = Arrays.asList(
        "org.apache.maven.plugins",
        "org.codehaus.mojo"
    );
    
    PluginPrefixResult prefixResult = prefixResolver.resolve(
        prefix, pluginGroups, session.getRepositorySession());
    
    // Create plugin with resolved coordinates  
    Plugin plugin = new Plugin();
    plugin.setGroupId(prefixResult.getGroupId());
    plugin.setArtifactId(prefixResult.getArtifactId());
    
    // Resolve version if not specified
    if (plugin.getVersion() == null) {
        PluginVersionRequest versionRequest = new DefaultPluginVersionRequest(plugin, session);
        PluginVersionResult versionResult = versionResolver.resolve(versionRequest);
        plugin.setVersion(versionResult.getVersion());
    }
    
    System.out.println("Resolved plugin: " + plugin.getGroupId() + ":" + 
                      plugin.getArtifactId() + ":" + plugin.getVersion() +
                      " from prefix: " + prefix);
    
    return plugin;
}

// Example usage
public void executePluginByPrefix(String prefix, String goal, MavenSession session) throws Exception {
    // Resolve plugin from prefix
    Plugin plugin = resolvePluginFromPrefix(prefix, session);
    
    // Load plugin descriptor
    PluginDescriptor descriptor = buildPluginManager.loadPlugin(
        plugin, session.getCurrentProject().getPluginArtifactRepositories(),
        session.getRepositorySession());
    
    // Create and execute mojo
    MojoExecution execution = new MojoExecution(descriptor.getMojo(goal));
    buildPluginManager.executeMojo(session, execution);
}

public interface PluginDescriptor {
    String getGroupId();
    String getArtifactId();
    String getVersion();
    String getGoalPrefix();
    
    List<MojoDescriptor> getMojos();
    MojoDescriptor getMojo(String goal);
    
    ClassRealm getClassRealm();
    void setClassRealm(ClassRealm classRealm);
    
    List<Artifact> getArtifacts();
    void setArtifacts(List<Artifact> artifacts);
    
    List<ComponentDescriptor<?>> getComponents();
}

public interface MojoDescriptor {
    String getGoal();
    String getPhase();
    String getExecutePhase();
    String getExecuteGoal();
    String getExecuteLifecycle();
    
    String getImplementation();
    String getLanguage();
    String getComponentType();
    String getInstantiationStrategy();
    
    boolean isAggregator();
    boolean isDirectInvocationOnly();
    boolean isProjectRequired();
    boolean isOnlineRequired();
    boolean isInheritedByDefault();
    
    List<Parameter> getParameters();
    Parameter getParameter(String name);
    
    PluginDescriptor getPluginDescriptor();
}

public interface Parameter {
    String getName();
    String getType();
    boolean isRequired();
    boolean isEditable();
    String getDescription();
    String getExpression();
    String getDefaultValue();
}

public interface PluginArtifactsResult {
    List<Artifact> getArtifacts();
    Map<String, Artifact> getArtifactMap();
}

public interface ClassRealm extends ClassLoader {
    String getId();
    ClassWorld getWorld();
    
    void importFrom(String realmId, String packageName);
    void importFromParent(String packageName);
    
    ClassRealm getParentRealm();
    Collection<ClassRealm> getImportRealms();
    
    void addURL(URL url);
    URL[] getURLs();
    
    void display();
}

public interface CacheCleanupCallback {
    void cleanup(CacheRecord record);
}

public interface PluginPrefixResult {
    String getGroupId();
    String getArtifactId();
}

public interface PluginVersionResult {
    String getVersion();
    Repository getRepository();
}