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package io.machinecode.then.core;

import io.machinecode.then.api.ExecutablePromise;
import io.machinecode.then.api.Promise;

import java.util.concurrent.Callable;

/**
 * @author Brent Douglas
 * @since 1.0
 */
public class CallableDeferred extends DeferredImpl implements ExecutablePromise, Promise, Callable, Runnable {

    protected final Callable call;

    public CallableDeferred(final Callable call) {
        this.call = call;
    }

    @Override
    public void run() {
        final T that;
        try {
            that = call.call();
        } catch (final Throwable e) {
            reject(e);
            return;
        }
        resolve(that);
    }

    @Override
    public T call() throws Exception {
        run();
        return get();
    }

    @Override
    public Runnable asRunnable() {
        return this;
    }

    @Override
    public Callable asCallable() {
        return this;
    }
}