Command-Line Interface

/**
 * Main command-line frontend for executing Flink programs and managing clusters
 */
public class CliFrontend {
    /**
     * Main entry point for CLI operations
     * @param args Command-line arguments
     */
    public static void main(String[] args);
    
    /**
     * Parse command-line arguments and execute the corresponding action
     * @param args Command-line arguments
     * @return Exit code (0 for success, non-zero for failure)
     */
    public int parseAndRun(String[] args);
    
    /**
     * Create CLI frontend with default configuration
     */
    public CliFrontend();
    
    /**
     * Create CLI frontend with custom configuration and command-line implementations
     * @param config Flink configuration
     * @param customCommandLines Custom command-line implementations
     */
    public CliFrontend(Configuration config, List<CustomCommandLine> customCommandLines);
}

# Submit a job
flink run -c com.mycompany.MyJob /path/to/job.jar --input input.txt

# List running jobs
flink list

# Cancel a job
flink cancel <job-id>

# Create a savepoint
flink savepoint <job-id> [target-directory]

# Stop a job with savepoint
flink stop <job-id> [--savepointPath <path>]

/**
 * Parser for CLI frontend commands and options
 */
public class CliFrontendParser {
    /**
     * Parse run command arguments
     * @param args Command arguments
     * @return Parsed program options
     * @throws CliArgsException if parsing fails
     */
    public static ProgramOptions parseRunCommand(String[] args) throws CliArgsException;
    
    /**
     * Parse cancel command arguments
     * @param args Command arguments
     * @return Parsed cancel options
     * @throws CliArgsException if parsing fails
     */
    public static CancelOptions parseCancelCommand(String[] args) throws CliArgsException;
    
    /**
     * Parse savepoint command arguments
     * @param args Command arguments
     * @return Parsed savepoint options
     * @throws CliArgsException if parsing fails
     */
    public static SavepointOptions parseSavepointCommand(String[] args) throws CliArgsException;
    
    /**
     * Parse list command arguments
     * @param args Command arguments
     * @return Parsed list options
     * @throws CliArgsException if parsing fails
     */
    public static ListOptions parseListCommand(String[] args) throws CliArgsException;
}

/**
 * Interface for custom command-line implementations
 */
public interface CustomCommandLine {
    /**
     * Check if this command line handles the given options
     * @param commandLine Parsed command line
     * @return true if this implementation handles the options
     */
    boolean isActive(CommandLine commandLine);
    
    /**
     * Get the command line options for this implementation
     * @return Apache Commons CLI Options
     */
    Options getOptions();
    
    /**
     * Create cluster descriptor from parsed command line
     * @param commandLine Parsed command line
     * @return Cluster descriptor
     * @throws FlinkException if creation fails
     */
    ClusterDescriptor<?> createClusterDescriptor(CommandLine commandLine) throws FlinkException;
    
    /**
     * Get cluster ID from parsed command line
     * @param commandLine Parsed command line
     * @return Cluster ID or null if not applicable
     */
    @Nullable
    String getClusterId(CommandLine commandLine);
}

/**
 * Base class for command-line options
 */
public abstract class CommandLineOptions {
    public String getCommandLine();
}

/**
 * Options for program execution commands
 */
public class ProgramOptions extends CommandLineOptions {
    public String getJarFilePath();
    public String getEntryPointClassName();
    public String[] getProgramArgs();
    public int getParallelism();
    public boolean getDetachedMode();
    public SavepointRestoreSettings getSavepointRestoreSettings();
}

/**
 * Options for job cancellation commands
 */
public class CancelOptions extends CommandLineOptions {
    public String getJobId();
    public boolean isWithSavepoint();
    public String getTargetDirectory();
}

/**
 * Options for savepoint management commands
 */
public class SavepointOptions extends CommandLineOptions {
    public String getJobId();
    public String getSavepointPath();
    public boolean isDispose();
    public SavepointFormatType getFormatType();
}

/**
 * Options for job listing commands
 */
public class ListOptions extends CommandLineOptions {
    public boolean getShowRunning();
    public boolean getShowScheduled();
    public boolean getShowAll();
}

/**
 * Options for job stop commands
 */
public class StopOptions extends CommandLineOptions {
    public String getJobId();
    public boolean isWithDrain();
    public String getSavepointPath();
}

/**
 * CLI deployer for application clusters
 */
public class ApplicationDeployer {
    /**
     * Deploy application to cluster
     * @param config Flink configuration
     * @param applicationConfiguration Application configuration
     * @param programOptions Program options from CLI
     * @param customCommandLines Available custom command lines
     * @return Cluster client provider
     * @throws Exception if deployment fails
     */
    public static ClusterClientProvider<?> deploy(
        Configuration config,
        ApplicationConfiguration applicationConfiguration,
        ProgramOptions programOptions,
        List<CustomCommandLine> customCommandLines
    ) throws Exception;
}

/**
 * Utilities for working with program options
 */
public class ProgramOptionsUtils {
    /**
     * Create packaged program from options
     * @param options Program options
     * @param config Flink configuration
     * @return Packaged program
     * @throws Exception if creation fails
     */
    public static PackagedProgram createPackagedProgram(
        ProgramOptions options, 
        Configuration config
    ) throws Exception;
}

/**
 * Utilities for dynamic property handling
 */
public class DynamicPropertiesUtil {
    /**
     * Parse dynamic properties from command line
     * @param dynamicProperties Array of property strings
     * @return Configuration with parsed properties
     */
    public static Configuration parseFlinkProperties(String[] dynamicProperties);
}

/**
 * Exception for CLI argument parsing errors
 */
public class CliArgsException extends Exception {
    public CliArgsException(String message);
    public CliArgsException(String message, Throwable cause);
}