Lifecycle Management

/**
 * Manages the lifecycle of an App in the DeploymentManager with a default graph setup
 */
public class AppLifeCycle extends Graph {
    // Standard lifecycle state constants
    public static final String UNDEPLOYED = "undeployed";
    public static final String DEPLOYING = "deploying"; 
    public static final String DEPLOYED = "deployed";
    public static final String STARTING = "starting";
    public static final String STARTED = "started";
    public static final String STOPPING = "stopping";
    public static final String UNDEPLOYING = "undeploying";
    public static final String FAILED = "failed";
    
    /** Creates default lifecycle graph with standard states and transitions */
    public AppLifeCycle();
    
    /** Adds a lifecycle binding for state transition processing */
    public void addBinding(AppLifeCycle.Binding binding);
    
    /** Removes a lifecycle binding */
    public void removeBinding(AppLifeCycle.Binding binding);
    
    /** Returns all lifecycle bindings */
    public Set<AppLifeCycle.Binding> getBindings();
    
    /** Returns bindings for a specific node */
    public Set<AppLifeCycle.Binding> getBindings(Node node);
    
    /** Returns bindings for a specific node name */
    public Set<AppLifeCycle.Binding> getBindings(String nodeName);
    
    /** Executes all bindings for a node during app lifecycle transition */
    public void runBindings(Node node, App app, DeploymentManager deploymentManager) throws Throwable;
}

import org.eclipse.jetty.deploy.AppLifeCycle;
import org.eclipse.jetty.deploy.bindings.*;

// Get the lifecycle from deployment manager
AppLifeCycle lifecycle = deploymentManager.getLifeCycle();

// Add custom bindings for specific states
lifecycle.addBinding(new DebugBinding(AppLifeCycle.DEPLOYING, AppLifeCycle.STARTED));

// Custom binding implementation
AppLifeCycle.Binding customBinding = new AppLifeCycle.Binding() {
    @Override
    public String[] getBindingTargets() {
        return new String[] { AppLifeCycle.STARTED };
    }
    
    @Override
    public void processBinding(Node node, App app) throws Exception {
        System.out.println("App started: " + app.getPath());
        // Custom initialization logic here
    }
};
lifecycle.addBinding(customBinding);

// Check bindings for a specific state
Set<AppLifeCycle.Binding> startBindings = lifecycle.getBindings(AppLifeCycle.STARTED);
System.out.println("Bindings for 'started' state: " + startBindings.size());

/**
 * Interface for objects that process lifecycle state transitions
 */
public static interface AppLifeCycle.Binding {
    /** Returns array of target node names this binding should be executed for */
    String[] getBindingTargets();
    
    /** Processes a lifecycle binding when an app transitions to the target state */
    void processBinding(Node node, App app) throws Exception;
}

/**
 * Debug binding that logs processing information
 */
public class DebugBinding implements AppLifeCycle.Binding {
    /** Creates binding for a single target state */
    public DebugBinding(String target);
    
    /** Creates binding for multiple target states */
    public DebugBinding(String... targets);
    
    /** Returns binding targets */
    public String[] getBindingTargets();
    
    /** Processes binding with debug logging */
    public void processBinding(Node node, App app) throws Exception;
}

/**
 * Provides ordered execution of bindings within a declared binding target
 */
public class OrderedGroupBinding implements AppLifeCycle.Binding {
    /** Creates ordered group for specified target states */
    public OrderedGroupBinding(String[] bindingTargets);
    
    /** Adds a binding to the ordered execution group */
    public void addBinding(AppLifeCycle.Binding binding);
    
    /** Adds multiple bindings to the ordered execution group */
    public void addBindings(AppLifeCycle.Binding[] bindings);
    
    /** Returns binding targets */
    public String[] getBindingTargets();
    
    /** Processes all bindings in the specified order */
    public void processBinding(Node node, App app) throws Exception;
}

/**
 * Standard deployer binding for the "deploying" lifecycle state
 */
public class StandardDeployer implements AppLifeCycle.Binding {
    /** Creates standard deployer binding */
    public StandardDeployer();
    
    /** Returns ["deploying"] */
    public String[] getBindingTargets();
    
    /** Deploys the context handler to the server */
    public void processBinding(Node node, App app) throws Exception;
}

/**
 * Standard starter binding for the "starting" lifecycle state  
 */
public class StandardStarter implements AppLifeCycle.Binding {
    /** Creates standard starter binding */
    public StandardStarter();
    
    /** Returns ["starting"] */
    public String[] getBindingTargets();
    
    /** Starts the context handler */
    public void processBinding(Node node, App app) throws Exception;
}

/**
 * Standard stopper binding for the "stopping" lifecycle state
 */
public class StandardStopper implements AppLifeCycle.Binding {
    /** Creates standard stopper binding */
    public StandardStopper();
    
    /** Returns ["stopping"] */
    public String[] getBindingTargets();
    
    /** Stops the context handler */
    public void processBinding(Node node, App app) throws Exception;
}

/**
 * Standard undeployer binding for the "undeploying" lifecycle state
 */
public class StandardUndeployer implements AppLifeCycle.Binding {
    /** Creates standard undeployer binding */
    public StandardUndeployer();
    
    /** Returns ["undeploying"] */
    public String[] getBindingTargets();
    
    /** Undeploys and destroys the context handler */
    public void processBinding(Node node, App app) throws Exception;
}

import org.eclipse.jetty.deploy.bindings.*;

// Use debug binding to trace lifecycle transitions
DebugBinding debugAll = new DebugBinding(
    AppLifeCycle.DEPLOYING,
    AppLifeCycle.STARTING, 
    AppLifeCycle.STOPPING,
    AppLifeCycle.UNDEPLOYING
);
lifecycle.addBinding(debugAll);

// Create ordered execution group for complex deployment
OrderedGroupBinding deploymentGroup = new OrderedGroupBinding(
    new String[] { AppLifeCycle.DEPLOYING }
);

// Add bindings in specific order
deploymentGroup.addBinding(new CustomSecurityBinding());
deploymentGroup.addBinding(new StandardDeployer());
deploymentGroup.addBinding(new CustomLoggingBinding());

lifecycle.addBinding(deploymentGroup);

// Override standard bindings with custom implementations
lifecycle.removeBinding(standardDeployer); // Remove default
lifecycle.addBinding(new CustomDeployer()); // Add custom

// Conditional binding based on app properties
AppLifeCycle.Binding conditionalBinding = new AppLifeCycle.Binding() {
    @Override
    public String[] getBindingTargets() {
        return new String[] { AppLifeCycle.STARTED };
    }
    
    @Override
    public void processBinding(Node node, App app) throws Exception {
        if (app.getProperties().containsKey("enable.monitoring")) {
            // Enable monitoring for this app
            MonitoringService.register(app);
        }
    }
};
lifecycle.addBinding(conditionalBinding);

// Monitor app lifecycle states
App app = deploymentManager.getApp("/path/to/app.war");
DeploymentManager.AppEntry entry = deploymentManager.getAppEntries()
    .stream()
    .filter(e -> e.getApp().equals(app))
    .findFirst()
    .orElse(null);

if (entry != null) {
    Node currentState = entry.getLifecyleNode();
    System.out.println("App state: " + currentState.getName());
    
    // Request state transitions
    switch (currentState.getName()) {
        case AppLifeCycle.DEPLOYED:
            deploymentManager.requestAppGoal(app, AppLifeCycle.STARTED);
            break;
        case AppLifeCycle.STARTED:
            deploymentManager.requestAppGoal(app, AppLifeCycle.STOPPED);
            break;
        case AppLifeCycle.FAILED:
            // Attempt recovery
            deploymentManager.requestAppGoal(app, AppLifeCycle.UNDEPLOYED);
            break;
    }
}