Lifecycle Management

public interface LifecycleExecutor {
    /**
     * Calculate execution plan for specified tasks and projects.
     *
     * @param session Maven session containing projects and configuration
     * @param tasks array of tasks (phases/goals) to execute
     * @return execution plan containing ordered mojo executions
     * @throws PluginNotFoundException if required plugin cannot be found
     * @throws PluginResolutionException if plugin resolution fails
     * @throws LifecyclePhaseNotFoundException if phase is not defined
     * @throws LifecycleNotFoundException if lifecycle is not found
     * @throws InvalidPluginDescriptorException if plugin descriptor is invalid
     */
    MavenExecutionPlan calculateExecutionPlan(MavenSession session, String... tasks)
        throws PluginNotFoundException, PluginResolutionException, LifecyclePhaseNotFoundException, 
               LifecycleNotFoundException, InvalidPluginDescriptorException;
    
    /**
     * Calculate execution plan for specific projects.
     *
     * @param session Maven session
     * @param projects list of projects to plan for
     * @param tasks array of tasks to execute
     * @return execution plan
     */
    MavenExecutionPlan calculateExecutionPlan(MavenSession session, List<MavenProject> projects, String... tasks)
        throws PluginNotFoundException, PluginResolutionException, LifecyclePhaseNotFoundException,
               LifecycleNotFoundException, InvalidPluginDescriptorException;
    
    /**
     * Execute the Maven session.
     *
     * @param session Maven session to execute
     */
    void execute(MavenSession session);
    
    /**
     * Execute forked executions for a mojo.
     *
     * @param mojoExecution mojo execution that requires forked executions
     * @param session Maven session
     * @return list of projects from forked executions
     * @throws LifecycleExecutionException if execution fails
     */
    List<MavenProject> executeForkedExecutions(MojoExecution mojoExecution, MavenSession session) 
        throws LifecycleExecutionException;
}

import org.apache.maven.lifecycle.LifecycleExecutor;
import org.apache.maven.lifecycle.MavenExecutionPlan;

@Component
private LifecycleExecutor lifecycleExecutor;

public void executeLifecyclePhases(MavenSession session) throws Exception {
    // Calculate execution plan for compile phase
    MavenExecutionPlan plan = lifecycleExecutor.calculateExecutionPlan(
        session, "clean", "compile", "test");
    
    System.out.println("Execution plan contains " + plan.size() + " mojo executions:");
    for (MojoExecution execution : plan.getMojoExecutions()) {
        System.out.println("  " + execution.getLifecyclePhase() + ": " +
                          execution.getPlugin().getArtifactId() + ":" + execution.getGoal());
    }
    
    // Execute the session (this will execute the calculated plan)
    lifecycleExecutor.execute(session);
}

public void analyzeExecutionPlan(MavenSession session, String... goals) throws Exception {
    MavenExecutionPlan plan = lifecycleExecutor.calculateExecutionPlan(session, goals);
    
    // Group executions by lifecycle phase
    Map<String, List<MojoExecution>> executionsByPhase = new LinkedHashMap<>();
    
    for (MojoExecution execution : plan) {
        String phase = execution.getLifecyclePhase();
        executionsByPhase.computeIfAbsent(phase, k -> new ArrayList<>()).add(execution);
    }
    
    // Display execution plan by phase
    System.out.println("Execution Plan Analysis:");
    for (Map.Entry<String, List<MojoExecution>> entry : executionsByPhase.entrySet()) {
        System.out.println("Phase: " + entry.getKey());
        for (MojoExecution execution : entry.getValue()) {
            Plugin plugin = execution.getPlugin();
            System.out.println("  -> " + plugin.getGroupId() + ":" + 
                              plugin.getArtifactId() + ":" + execution.getGoal() +
                              " [" + execution.getExecutionId() + "]");
        }
    }
}

public class MavenExecutionPlan implements Iterable<MojoExecution> {
    /**
     * Get all mojo executions in the plan.
     *
     * @return list of mojo executions in execution order
     */
    public List<MojoExecution> getMojoExecutions();
    
    /**
     * Get iterator over mojo executions.
     *
     * @return iterator for executions
     */
    public Iterator<MojoExecution> iterator();
    
    /**
     * Get number of executions in the plan.
     *
     * @return number of mojo executions
     */
    public int size();
    
    /**
     * Check if plan is empty.
     *
     * @return true if no executions in plan
     */
    public boolean isEmpty();
    
    /**
     * Find mojo executions by plugin key.
     *
     * @param pluginKey plugin key (groupId:artifactId)
     * @return list of matching executions
     */
    public List<MojoExecution> getMojoExecutions(String pluginKey);
    
    /**
     * Get last mojo execution for a plugin.
     *
     * @param pluginKey plugin key
     * @return last execution or null if not found
     */
    public MojoExecution findLastInPhase(String pluginKey);
}

public void processExecutionPlan(MavenExecutionPlan plan) {
    System.out.println("Processing execution plan with " + plan.size() + " executions");
    
    // Iterate through all executions
    for (MojoExecution execution : plan) {
        Plugin plugin = execution.getPlugin();
        System.out.println("Will execute: " + plugin.getArtifactId() + 
                          ":" + execution.getGoal() + 
                          " in phase: " + execution.getLifecyclePhase());
    }
    
    // Find specific plugin executions
    List<MojoExecution> compilerExecutions = plan.getMojoExecutions("org.apache.maven.plugins:maven-compiler-plugin");
    if (!compilerExecutions.isEmpty()) {
        System.out.println("Found " + compilerExecutions.size() + " compiler plugin executions:");
        for (MojoExecution execution : compilerExecutions) {
            System.out.println("  " + execution.getGoal() + " [" + execution.getExecutionId() + "]");
        }
    }
    
    // Check for test execution
    MojoExecution lastSurefireExecution = plan.findLastInPhase("org.apache.maven.plugins:maven-surefire-plugin");
    if (lastSurefireExecution != null) {
        System.out.println("Tests will be executed by: " + lastSurefireExecution.getExecutionId());
    }
}

public class Lifecycle {
    /**
     * Get lifecycle identifier.
     *
     * @return lifecycle ID (e.g., "default", "clean", "site")
     */
    public String getId();
    
    /**
     * Set lifecycle identifier.
     *
     * @param id lifecycle ID
     */
    public void setId(String id);
    
    /**
     * Get ordered list of phases in this lifecycle.
     *
     * @return list of phase names in execution order
     */
    public List<String> getPhases();
    
    /**
     * Set phases for this lifecycle.
     *
     * @param phases ordered list of phase names
     */
    public void setPhases(List<String> phases);
    
    /**
     * Get default phase bindings for packaging types.
     *
     * @return map from packaging type to phase bindings
     */
    public Map<String, LifecyclePhase> getDefaultPhases();
    
    /**
     * Set default phase bindings.
     *
     * @param defaultPhases map of packaging-specific bindings
     */
    public void setDefaultPhases(Map<String, LifecyclePhase> defaultPhases);
    
    /**
     * Get default bindings for a specific packaging type.
     *
     * @param packaging packaging type (e.g., "jar", "war", "pom")
     * @return phase bindings for the packaging type
     */
    public Map<String, String> getDefaultGoals(String packaging);
}

public class DefaultLifecycles {
    /**
     * Get all standard lifecycles.
     *
     * @return list of default lifecycles (default, clean, site)
     */
    public List<Lifecycle> getLifeCycles();
    
    /**
     * Get lifecycle by ID.
     *
     * @param lifecycleId lifecycle identifier
     * @return lifecycle instance or null if not found
     */
    public Lifecycle get(String lifecycleId);
    
    /**
     * Get phases for a specific lifecycle.
     *
     * @param lifecycleId lifecycle identifier
     * @return ordered list of phase names
     */
    public List<String> getLifecyclePhases(String lifecycleId);
}

import org.apache.maven.lifecycle.Lifecycle;
import org.apache.maven.lifecycle.DefaultLifecycles;

@Component
private DefaultLifecycles defaultLifecycles;

public void inspectLifecycles() {
    // Get all standard lifecycles
    List<Lifecycle> lifecycles = defaultLifecycles.getLifeCycles();
    
    for (Lifecycle lifecycle : lifecycles) {
        System.out.println("Lifecycle: " + lifecycle.getId());
        System.out.println("Phases: " + lifecycle.getPhases());
        
        // Show default bindings for common packaging types
        String[] packagingTypes = {"jar", "war", "pom", "maven-plugin"};
        for (String packaging : packagingTypes) {
            Map<String, String> bindings = lifecycle.getDefaultGoals(packaging);
            if (!bindings.isEmpty()) {
                System.out.println("  Default bindings for " + packaging + ":");
                for (Map.Entry<String, String> binding : bindings.entrySet()) {
                    System.out.println("    " + binding.getKey() + " -> " + binding.getValue());
                }
            }
        }
    }
}

public void analyzeDefaultLifecycle() {
    Lifecycle defaultLifecycle = defaultLifecycles.get("default");
    if (defaultLifecycle != null) {
        System.out.println("Default lifecycle phases:");
        List<String> phases = defaultLifecycle.getPhases();
        for (int i = 0; i < phases.size(); i++) {
            System.out.println((i + 1) + ". " + phases.get(i));
        }
        
        // Show JAR packaging bindings
        Map<String, String> jarBindings = defaultLifecycle.getDefaultGoals("jar");
        System.out.println("\nDefault JAR packaging bindings:");
        for (Map.Entry<String, String> entry : jarBindings.entrySet()) {
            System.out.println("  " + entry.getKey() + " -> " + entry.getValue());
        }
    }
}

public interface LifecycleExecutor {
    /**
     * Execute forked executions for a mojo that requires them.
     *
     * @param mojoExecution the mojo execution requesting forked executions
     * @param session Maven session
     * @return list of projects resulting from forked executions
     * @throws LifecycleExecutionException if forked execution fails
     */
    List<MavenProject> executeForkedExecutions(MojoExecution mojoExecution, MavenSession session)
        throws LifecycleExecutionException;
}

public void handleForkedExecution(MojoExecution mojoExecution, MavenSession session) throws Exception {
    // Check if mojo has forked executions defined
    MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();
    
    if (mojoDescriptor.getExecutePhase() != null || mojoDescriptor.getExecuteGoal() != null) {
        System.out.println("Mojo " + mojoExecution.getGoal() + " requires forked execution");
        
        // Execute forked executions
        List<MavenProject> forkedProjects = lifecycleExecutor.executeForkedExecutions(
            mojoExecution, session);
        
        System.out.println("Forked execution completed for " + forkedProjects.size() + " projects:");
        for (MavenProject project : forkedProjects) {
            System.out.println("  " + project.getGroupId() + ":" + project.getArtifactId());
        }
    }
}

// Example: Integration test with forked lifecycle
public void runIntegrationTestsWithForking(MavenSession session) throws Exception {
    // Find failsafe plugin execution (commonly uses forked executions)
    MavenExecutionPlan plan = lifecycleExecutor.calculateExecutionPlan(
        session, "pre-integration-test", "integration-test", "post-integration-test");
    
    for (MojoExecution execution : plan) {
        Plugin plugin = execution.getPlugin();
        
        if ("maven-failsafe-plugin".equals(plugin.getArtifactId()) && 
            "integration-test".equals(execution.getGoal())) {
            
            System.out.println("Running integration tests with forked lifecycle");
            
            // This may trigger forked executions to prepare test environment
            List<MavenProject> forkedProjects = lifecycleExecutor.executeForkedExecutions(
                execution, session);
            
            if (!forkedProjects.isEmpty()) {
                System.out.println("Forked executions prepared " + forkedProjects.size() + 
                                  " projects for integration testing");
            }
        }
    }
}

public abstract class AbstractMavenLifecycleParticipant {
    /**
     * Called before projects are built. Allows modification of projects
     * and execution request before lifecycle execution begins.
     *
     * @param session Maven session
     * @throws MavenExecutionException if participant processing fails
     */
    public void afterProjectsRead(MavenSession session) throws MavenExecutionException {
        // Default implementation does nothing
    }
    
    /**
     * Called after session is started but before lifecycle execution.
     *
     * @param session Maven session
     * @throws MavenExecutionException if participant processing fails
     */
    public void afterSessionStart(MavenSession session) throws MavenExecutionException {
        // Default implementation does nothing
    }
    
    /**
     * Called after session ends, regardless of success or failure.
     *
     * @param session Maven session
     * @throws MavenExecutionException if participant processing fails
     */
    public void afterSessionEnd(MavenSession session) throws MavenExecutionException {
        // Default implementation does nothing
    }
}

import org.apache.maven.AbstractMavenLifecycleParticipant;
import org.apache.maven.MavenExecutionException;
import org.apache.maven.execution.MavenSession;
import org.codehaus.plexus.component.annotations.Component;

@Component(role = AbstractMavenLifecycleParticipant.class, hint = "custom-participant")
public class CustomLifecycleParticipant extends AbstractMavenLifecycleParticipant {
    
    @Override
    public void afterProjectsRead(MavenSession session) throws MavenExecutionException {
        System.out.println("Custom lifecycle participant: projects read");
        
        // Modify projects before build starts
        for (MavenProject project : session.getProjects()) {
            // Add custom properties
            project.getProperties().setProperty("custom.build.timestamp", 
                String.valueOf(System.currentTimeMillis()));
            
            // Modify build configuration if needed
            if ("jar".equals(project.getPackaging())) {
                System.out.println("Customizing JAR project: " + project.getArtifactId());
                // Custom logic for JAR projects
            }
        }
    }
    
    @Override
    public void afterSessionStart(MavenSession session) throws MavenExecutionException {
        System.out.println("Custom lifecycle participant: session started");
        
        // Log build information
        System.out.println("Build started for " + session.getProjects().size() + " projects");
        System.out.println("Goals: " + session.getRequest().getGoals());
        
        // Validate build environment
        validateBuildEnvironment(session);
    }
    
    @Override
    public void afterSessionEnd(MavenSession session) throws MavenExecutionException {
        System.out.println("Custom lifecycle participant: session ended");
        
        // Cleanup or post-build processing
        long buildTime = System.currentTimeMillis() - session.getRequest().getStartTime().getTime();
        System.out.println("Total build time: " + buildTime + "ms");
        
        // Generate custom reports or notifications
        generateBuildReport(session);
    }
    
    private void validateBuildEnvironment(MavenSession session) throws MavenExecutionException {
        // Custom validation logic
        String javaVersion = System.getProperty("java.version");
        if (javaVersion.startsWith("1.8")) {
            throw new MavenExecutionException("Java 8 is not supported for this build", 
                                            (Throwable) null);
        }
    }
    
    private void generateBuildReport(MavenSession session) {
        // Custom reporting logic
        System.out.println("=== Build Report ===");
        for (MavenProject project : session.getProjects()) {
            System.out.println("Project: " + project.getName() + " - " + project.getVersion());
        }
    }
}

public interface LifecyclePhase {
    List<Plugin> getPlugins();
    void addPlugin(Plugin plugin);
    String toString();
}

public class LifecyclePhaseNotFoundException extends Exception {
    public LifecyclePhaseNotFoundException(String message);
    public LifecyclePhaseNotFoundException(String message, Throwable cause);
}

public class LifecycleNotFoundException extends Exception {
    public LifecycleNotFoundException(String message);
    public LifecycleNotFoundException(String message, Throwable cause);
}

public class InvalidPluginDescriptorException extends Exception {
    public InvalidPluginDescriptorException(String message);
    public InvalidPluginDescriptorException(String message, Throwable cause);
}

public interface MojoDescriptor {
    String getExecutePhase();
    String getExecuteGoal(); 
    String getExecuteLifecycle();
    boolean requiresProject();
    boolean requiresReports();
    boolean aggregator();
    boolean requiresDirectInvocation();
    boolean requiresOnline();
    boolean inheritedByDefault();
    String getPhase();
    String getSince();
    String getDeprecated();
}

public interface LifecycleMapping {
    Map<String, String> getPhases(String packaging);
    List<String> getOptionalMojos(String packaging);
}

public interface LifecycleMappingDelegate {
    Map<String, List<MojoExecution>> calculateLifecycleMappings(MavenSession session, 
        MavenProject project, Lifecycle lifecycle, String lifecyclePhase) 
        throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException, 
               MojoNotFoundException, InvalidPluginDescriptorException;
}