Native Bridge

/**
 * Generate bridge from HotSpot to Native Image
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface GenerateHotSpotToNativeBridge {
    /** Target native interface */
    Class<?> value();
    
    /** Bridge name (defaults to interface name) */
    String name() default "";
    
    /** Whether to include debug information */
    boolean debug() default false;
    
    /** Custom marshaller configuration */
    Class<? extends MarshallerConfig> marshallerConfig() default DefaultMarshallerConfig.class;
}

/**
 * Generate bridge between native contexts
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface GenerateNativeToNativeBridge {
    /** Target native interface */
    Class<?> value();
    
    /** Bridge name (defaults to interface name) */
    String name() default "";
    
    /** Include performance monitoring */
    boolean monitoring() default false;
}

import org.graalvm.nativebridge.*;

// Define interface for bridging
public interface DataProcessor {
    String processData(byte[] input, ProcessingOptions options);
    int getVersion();
}

// Generate HotSpot to Native bridge
@GenerateHotSpotToNativeBridge(DataProcessor.class)
public class DataProcessorBridge {
    // Implementation generated automatically
}

// Generate Native to Native bridge
@GenerateNativeToNativeBridge(DataProcessor.class)
public class FastDataProcessorBridge {
    // High-performance native-only bridge
}

/**
 * Base interface for custom object marshalling between runtimes
 */
public interface BinaryMarshaller<T> {
    /** Convert object to binary representation */
    byte[] marshal(T object);
    
    /** Convert binary representation back to object */
    T unmarshal(byte[] data);
    
    /** Get marshalled data size estimate */
    int estimateSize(T object);
    
    /** Check if object can be marshalled */
    boolean canMarshal(T object);
}

/**
 * Specialized marshaller for string objects with encoding support
 */
public interface StringMarshaller extends BinaryMarshaller<String> {
    /** Convert string with specific encoding */
    byte[] marshal(String string, Charset encoding);
    
    /** Convert with encoding detection */
    String unmarshal(byte[] data, Charset encoding);
    
    /** Get supported encodings */
    Set<Charset> getSupportedEncodings();
}

/**
 * Marshaller that handles null values gracefully
 */
public interface NullableBinaryMarshaller<T> extends BinaryMarshaller<T> {
    /** Marshal nullable object */
    byte[] marshalNullable(T object);
    
    /** Unmarshal potentially null object */
    T unmarshalNullable(byte[] data);
    
    /** Check if data represents null */
    boolean isNull(byte[] data);
}

public class CustomObjectMarshaller implements BinaryMarshaller<CustomObject> {
    @Override
    public byte[] marshal(CustomObject obj) {
        // Custom serialization logic
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(obj);
            return baos.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException("Failed to marshal object", e);
        }
    }
    
    @Override
    public CustomObject unmarshal(byte[] data) {
        // Custom deserialization logic
        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(data))) {
            return (CustomObject) ois.readObject();
        } catch (Exception e) {
            throw new RuntimeException("Failed to unmarshal object", e);
        }
    }
    
    @Override
    public int estimateSize(CustomObject object) {
        return object.getEstimatedSize();
    }
    
    @Override
    public boolean canMarshal(CustomObject object) {
        return object.isSerializable();
    }
}

/**
 * Configuration for marshaller behavior and type mappings
 */
public interface MarshallerConfig {
    /** Get marshaller for specific type */
    <T> BinaryMarshaller<T> getMarshaller(Class<T> type);
    
    /** Register custom marshaller for type */
    <T> void registerMarshaller(Class<T> type, BinaryMarshaller<T> marshaller);
    
    /** Get default marshaller for unknown types */
    BinaryMarshaller<Object> getDefaultMarshaller();
    
    /** Check if type has registered marshaller */
    boolean hasMarshaller(Class<?> type);
    
    /** Get marshalling options */
    MarshallingOptions getOptions();
}

/**
 * Default marshaller configuration with built-in type support
 */
public class DefaultMarshallerConfig implements MarshallerConfig {
    /** Create default configuration */
    public static DefaultMarshallerConfig create();
    
    /** Create with custom options */
    public static DefaultMarshallerConfig create(MarshallingOptions options);
}

/**
 * Options for controlling marshalling behavior
 */
public static class MarshallingOptions {
    /** Enable compression for large objects */
    public final boolean compression;
    
    /** Maximum object size for marshalling */
    public final int maxObjectSize;
    
    /** Charset for string encoding */
    public final Charset defaultCharset;
    
    /** Enable type safety checks */
    public final boolean typeSafety;
    
    public MarshallingOptions(boolean compression, int maxObjectSize, 
                            Charset defaultCharset, boolean typeSafety);
}

/**
 * Configuration for native isolate creation and management
 */
public static class NativeIsolateConfig {
    /** Maximum heap size for isolate */
    public final long maxHeapSize;
    
    /** Initial heap size */
    public final long initialHeapSize;
    
    /** Stack size per thread */
    public final int stackSize;
    
    /** Enable debugging support */
    public final boolean debugMode;
    
    /** Custom isolate parameters */
    public final Map<String, String> parameters;
    
    public NativeIsolateConfig(long maxHeapSize, long initialHeapSize, 
                              int stackSize, boolean debugMode, 
                              Map<String, String> parameters);
    
    /** Create default configuration */
    public static NativeIsolateConfig createDefault();
}

/**
 * Process-level isolate management for bridge communication
 */
public final class ProcessIsolate {
    /** Create new process isolate with configuration */
    public static ProcessIsolate create(NativeIsolateConfig config);
    
    /** Get current process isolate */
    public static ProcessIsolate getCurrent();
    
    /** Execute operation in isolate context */
    public <T> T execute(Callable<T> operation);
    
    /** Execute void operation in isolate context */
    public void execute(Runnable operation);
    
    /** Shutdown isolate and clean up resources */
    public void shutdown();
    
    /** Check if isolate is active */
    public boolean isActive();
    
    /** Get isolate configuration */
    public NativeIsolateConfig getConfig();
}

/**
 * Exception thrown when isolate creation fails
 */
public class IsolateCreateException extends Exception {
    public IsolateCreateException(String message);
    public IsolateCreateException(String message, Throwable cause);
    public IsolateCreateException(Throwable cause);
}

public class IsolateExample {
    public void setupIsolate() throws IsolateCreateException {
        // Configure isolate
        NativeIsolateConfig config = new NativeIsolateConfig(
            1024 * 1024 * 64,  // 64MB max heap
            1024 * 1024 * 16,  // 16MB initial heap  
            8192,              // 8KB stack size
            true,              // Enable debugging
            Map.of("opt.level", "3")  // Custom parameters
        );
        
        // Create and use isolate
        try (ProcessIsolate isolate = ProcessIsolate.create(config)) {
            String result = isolate.execute(() -> {
                // Execute in isolate context
                return performComputation();
            });
            
            System.out.println("Result: " + result);
        }
    }
    
    private String performComputation() {
        return "Computed in isolate";
    }
}

/**
 * Marker annotation for passing objects by remote reference
 */
@Target({ElementType.PARAMETER, ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ByRemoteReference {
    /** Reference timeout in milliseconds */
    long timeout() default 30000L;
    
    /** Whether to cache references */
    boolean cache() default true;
}

/**
 * Force all instances of type to be passed by remote reference
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface AlwaysByRemoteReference {
    /** Default timeout for all references */
    long defaultTimeout() default 60000L;
}

/**
 * Force all instances of type to be passed by local value
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface AlwaysByLocalReference {
    /** Whether to validate during marshalling */
    boolean validate() default true;
}

// Always pass by remote reference
@AlwaysByRemoteReference(defaultTimeout = 120000L)
public class ExpensiveResource {
    public void performOperation() {
        // Expensive operation executed remotely
    }
}

// Control reference passing per method
public interface ServiceBridge {
    // Pass by local value (default)
    String processData(String input);
    
    // Pass by remote reference with timeout
    void updateResource(@ByRemoteReference(timeout = 60000L) ExpensiveResource resource);
    
    // Return by remote reference
    @ByRemoteReference
    ExpensiveResource createResource();
}

/**
 * Represents a thread within a native isolate
 */
public interface NativeIsolateThread {
    /** Get thread ID */
    long getThreadId();
    
    /** Get associated isolate */
    Isolate getIsolate();
    
    /** Check if thread is current thread */
    boolean isCurrent();
    
    /** Attach to this thread context */
    void attach();
    
    /** Detach from this thread context */
    void detach();
    
    /** Execute operation in thread context */
    <T> T execute(Callable<T> operation);
}

/**
 * Represents a thread within HotSpot isolate
 */
public interface HSIsolateThread {
    /** Get Java thread object */
    Thread getJavaThread();
    
    /** Get thread name */
    String getName();
    
    /** Check if thread is daemon */
    boolean isDaemon();
    
    /** Get thread priority */
    int getPriority();
    
    /** Get thread state */
    Thread.State getState();
    
    /** Execute operation in HotSpot context */
    <T> T execute(Callable<T> operation);
}

/**
 * Callable interface for operations that return values
 */
public interface Callable<V> {
    V call() throws Exception;
}

/**
 * Base isolate interface
 */
public interface Isolate {
    /** Get isolate ID */
    long getId();
    
    /** Check if isolate is current */
    boolean isCurrent();
    
    /** Get isolate threads */
    Set<IsolateThread> getThreads();
}

/**
 * Base isolate thread interface
 */
public interface IsolateThread {
    /** Get thread ID */
    long getId();
    
    /** Get owning isolate */
    Isolate getIsolate();
}

/**
 * Character set enumeration for string encoding
 */
public enum Charset {
    UTF_8, UTF_16, ISO_8859_1, US_ASCII;
    
    /** Get canonical name */
    public String getCanonicalName();
    
    /** Check if charset supports encoding */
    public boolean canEncode();
}

/**
 * Input/output stream interfaces for binary data
 */
public interface ByteArrayOutputStream extends AutoCloseable {
    void write(int b);
    void write(byte[] b);
    byte[] toByteArray();
    void close();
}

public interface ByteArrayInputStream extends AutoCloseable {
    int read();
    int read(byte[] b);
    void close();
}