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package org.graalvm.nativeimage;

import java.util.concurrent.TimeUnit;

import org.graalvm.nativeimage.impl.ThreadingSupport;

Functionality related to execution in threads.
Since:
19.0/**
 * Functionality related to execution in threads.
 *
 * @since 19.0
 */
public final class Threading {

    private Threading() {
    }

    
Registers a callback handler that is called by the current thread approximately at the provided interval. Only one callback can be active per thread. Each thread can have its own callback with a different interval (or none at all). No guarantees are made about the actual interval. For example, when the thread is waiting for a lock or executing native code, no callback can be done. Exceptions that are thrown during the execution of the callback are caught and ignored, unless they are thrown via a call to RecurringCallbackAccess.throwException(Throwable). 
 Specifying null for callback clears the current thread's callback (in which case, the values of interval and unit are ignored). 
Since:
19.0/**
     * Registers a {@link RecurringCallback callback handler} that is called by the current thread
     * approximately at the provided interval. Only one callback can be active per thread. Each
     * thread can have its own callback with a different interval (or none at all). No guarantees
     * are made about the actual interval. For example, when the thread is waiting for a lock or
     * executing native code, no callback can be done. Exceptions that are thrown during the
     * execution of the callback are caught and ignored, unless they are thrown via a call to
     * {@link RecurringCallbackAccess#throwException(Throwable)}.
     * <p>
     * Specifying {@code null} for {@code callback} clears the current thread's callback (in which
     * case, the values of {@code interval} and {@code unit} are ignored).
     *
     * @since 19.0
     */
    public static void registerRecurringCallback(long interval, TimeUnit unit, RecurringCallback callback) {
        ImageSingletons.lookup(ThreadingSupport.class).registerRecurringCallback(interval, unit, callback);
    }

    
Interface that a callback handler needs to implement.
Since:
19.0/**
     * Interface that a callback handler needs to implement.
     *
     * @since 19.0
     */
    @FunctionalInterface
    public interface RecurringCallback {
        
Method that is called recurringly when the callback handler is installed.
Since:
19.0/**
         * Method that is called recurringly when the callback handler is installed.
         *
         * @since 19.0
         */
        void run(RecurringCallbackAccess access);
    }

    
Provides methods that are available during the execution of a RecurringCallback. 
Since:
19.0/**
     * Provides methods that are available during the execution of a {@link RecurringCallback}.
     *
     * @since 19.0
     */
    public interface RecurringCallbackAccess {
        
Throws an exception from the recurring callback to the code that is regularly executing
in the thread.
Since:
19.0/**
         * Throws an exception from the recurring callback to the code that is regularly executing
         * in the thread.
         *
         * @since 19.0
         */
        void throwException(Throwable t);
    }
}