Program Packaging and Execution

/**
 * Represents a Flink program packaged in a JAR file
 */
public class PackagedProgram implements AutoCloseable {
    /**
     * Create a new packaged program builder
     * @return Builder instance for constructing PackagedProgram
     */
    public static Builder newBuilder();
    
    /**
     * Get the main class of the packaged program
     * @return Main class object
     * @throws ProgramInvocationException if main class cannot be determined
     */
    public Class<?> getMainClass() throws ProgramInvocationException;
    
    /**
     * Get program arguments
     * @return Array of program arguments
     */
    public String[] getArguments();
    
    /**
     * Get JAR file URL
     * @return URL of the JAR file
     */
    public URL getJarFile();
    
    /**
     * Get user code class loader
     * @return Class loader for user code
     */
    public URLClassLoader getUserCodeClassLoader();
    
    /**
     * Get savepoint restore settings
     * @return Savepoint restore settings
     */
    public SavepointRestoreSettings getSavepointRestoreSettings();
    
    /**
     * Check if this is a Python program
     * @return true if Python program, false otherwise
     */
    public boolean isPython();
    
    /**
     * Invoke the program's main method for interactive execution
     * @throws ProgramInvocationException if execution fails
     */
    public void invokeInteractiveModeForExecution() throws ProgramInvocationException;
    
    /**
     * Get list of classpath URLs
     * @return List of classpath URLs
     */
    public List<URL> getClasspaths();
    
    /**
     * Check if program has main method
     * @return true if main method exists
     */
    public boolean hasMainMethod();
    
    @Override
    public void close();
    
    /**
     * Builder for creating PackagedProgram instances
     */
    public static class Builder {
        /**
         * Set JAR file for the program
         * @param jarFile JAR file containing the program
         * @return Builder instance
         */
        public Builder setJarFile(File jarFile);
        
        /**
         * Set program arguments
         * @param arguments Array of arguments
         * @return Builder instance
         */
        public Builder setArguments(String... arguments);
        
        /**
         * Set entry point class name
         * @param entryPointClassName Fully qualified class name
         * @return Builder instance
         */
        public Builder setEntryPointClassName(@Nullable String entryPointClassName);
        
        /**
         * Set savepoint restore settings
         * @param savepointRestoreSettings Savepoint settings
         * @return Builder instance
         */
        public Builder setSavepointRestoreSettings(SavepointRestoreSettings savepointRestoreSettings);
        
        /**
         * Set additional classpath URLs
         * @param classpaths List of classpath URLs
         * @return Builder instance
         */
        public Builder setClasspaths(List<URL> classpaths);
        
        /**
         * Set user code class loader
         * @param userCodeClassLoader Class loader for user code
         * @return Builder instance
         */
        public Builder setUserCodeClassLoader(URLClassLoader userCodeClassLoader);
        
        /**
         * Build the PackagedProgram instance
         * @return Configured PackagedProgram
         * @throws ProgramInvocationException if construction fails
         */
        public PackagedProgram build() throws ProgramInvocationException;
    }
}

import org.apache.flink.client.program.PackagedProgram;
import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings;

// Create a simple packaged program
PackagedProgram program = PackagedProgram.newBuilder()
    .setJarFile(new File("/path/to/flink-job.jar"))
    .setArguments("--input", "input.txt", "--output", "output.txt")
    .build();

// Create program with custom entry point
PackagedProgram programWithEntryPoint = PackagedProgram.newBuilder()
    .setJarFile(new File("/path/to/job.jar"))
    .setEntryPointClassName("com.mycompany.MyFlinkJob")
    .setArguments("--parallelism", "4")
    .build();

// Create program with savepoint restore
SavepointRestoreSettings savepointSettings = SavepointRestoreSettings
    .forPath("/path/to/savepoint", false);

PackagedProgram programWithSavepoint = PackagedProgram.newBuilder()
    .setJarFile(new File("/path/to/job.jar"))
    .setSavepointRestoreSettings(savepointSettings)
    .build();

// Use the program
System.out.println("Main class: " + program.getMainClass().getName());
System.out.println("Arguments: " + Arrays.toString(program.getArguments()));

// Clean up resources
program.close();

/**
 * Utilities for working with packaged programs
 */
public class PackagedProgramUtils {
    /**
     * Check if the program is a Python program
     * @param program Packaged program to check
     * @return true if Python program
     */
    public static boolean isPython(PackagedProgram program);
    
    /**
     * Check if file path represents a Python program
     * @param file File to check
     * @return true if Python file
     */
    public static boolean isPython(File file);
    
    /**
     * Get program description from packaged program
     * @param program Packaged program
     * @return Program description or null
     */
    @Nullable
    public static String getProgramDescription(PackagedProgram program);
    
    /**
     * Extract nested libraries from JAR file
     * @param jarFile JAR file to extract from
     * @param extractionDir Target directory for extraction
     * @return List of extracted library files
     * @throws IOException if extraction fails
     */
    public static List<File> extractNestedLibraries(File jarFile, File extractionDir) 
        throws IOException;
}

/**
 * Interface for retrieving packaged programs
 */
public interface PackagedProgramRetriever {
    /**
     * Retrieve a packaged program
     * @return PackagedProgram instance
     * @throws ProgramInvocationException if retrieval fails
     */
    PackagedProgram getPackagedProgram() throws ProgramInvocationException;
}

/**
 * Default implementation of packaged program retriever
 */
public class DefaultPackagedProgramRetriever implements PackagedProgramRetriever {
    /**
     * Create retriever with JAR file and arguments
     * @param jarFile JAR file containing the program
     * @param entryPointClassName Optional entry point class name
     * @param programArguments Program arguments
     * @param savepointRestoreSettings Savepoint restore settings
     * @param classpaths Additional classpath URLs
     */
    public DefaultPackagedProgramRetriever(
        File jarFile,
        @Nullable String entryPointClassName,
        String[] programArguments,
        SavepointRestoreSettings savepointRestoreSettings,
        List<URL> classpaths
    );
    
    @Override
    public PackagedProgram getPackagedProgram() throws ProgramInvocationException;
}

/**
 * Execution environment for stream processing contexts
 */
public class StreamContextEnvironment extends StreamExecutionEnvironment {
    /**
     * Create stream context environment
     * @param client Cluster client for job submission
     * @param parallelism Default parallelism
     * @param userCodeClassLoader User code class loader
     * @param savepointRestoreSettings Savepoint restore settings
     */
    public StreamContextEnvironment(
        ClusterClient<?> client,
        int parallelism,
        ClassLoader userCodeClassLoader,
        SavepointRestoreSettings savepointRestoreSettings
    );
    
    @Override
    public JobExecutionResult execute(String jobName) throws Exception;
    
    @Override
    public JobClient executeAsync(String jobName) throws Exception;
}

/**
 * Environment for stream plan generation
 */
public class StreamPlanEnvironment extends StreamExecutionEnvironment {
    /**
     * Create stream plan environment
     * @param executorServiceLoader Executor service loader
     * @param configuration Flink configuration
     * @param userCodeClassLoader User code class loader
     * @param savepointRestoreSettings Savepoint restore settings
     */
    public StreamPlanEnvironment(
        PipelineExecutorServiceLoader executorServiceLoader,
        Configuration configuration,
        ClassLoader userCodeClassLoader,
        SavepointRestoreSettings savepointRestoreSettings
    );
    
    @Override
    public JobExecutionResult execute(String jobName) throws Exception;
    
    /**
     * Get the execution plan as JSON
     * @return Execution plan JSON string
     */
    public String getExecutionPlan();
}

/**
 * Factory for per-job mini clusters
 */
public class PerJobMiniClusterFactory {
    /**
     * Create per-job mini cluster factory
     * @param miniClusterConfiguration Mini cluster configuration
     */
    public PerJobMiniClusterFactory(MiniClusterConfiguration miniClusterConfiguration);
    
    /**
     * Create mini cluster for job execution
     * @param jobGraph Job graph to execute
     * @return Mini cluster instance
     * @throws Exception if creation fails
     */
    public MiniCluster create(JobGraph jobGraph) throws Exception;
}

/**
 * Settings for savepoint restoration
 */
public class SavepointRestoreSettings {
    /**
     * Create settings for restoring from savepoint path
     * @param savepointPath Path to savepoint
     * @param allowNonRestoredState Whether to allow non-restored state
     * @return Savepoint restore settings
     */
    public static SavepointRestoreSettings forPath(
        String savepointPath, 
        boolean allowNonRestoredState
    );
    
    /**
     * Create settings with no savepoint restoration
     * @return Settings for no restoration
     */
    public static SavepointRestoreSettings none();
    
    /**
     * Check if restoration is enabled
     * @return true if restoration enabled
     */
    public boolean restoreSavepoint();
    
    /**
     * Get savepoint path
     * @return Savepoint path or null
     */
    @Nullable
    public String getRestorePath();
    
    /**
     * Check if non-restored state is allowed
     * @return true if allowed
     */
    public boolean allowNonRestoredState();
}

try {
    PackagedProgram program = PackagedProgram.newBuilder()
        .setJarFile(new File("job.jar"))
        .build();
    
    // Use program...
    program.close();
    
} catch (ProgramInvocationException e) {
    // Handle program construction/execution errors
    System.err.println("Program error: " + e.getMessage());
} catch (FileNotFoundException e) {
    // Handle missing JAR file
    System.err.println("JAR file not found: " + e.getMessage());
}