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A convenient way to organize asynchronous code. Promises are a faster and more efficient version of JavaScript's Promise and Java's CompletionStage's.

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/*
 * Copyright (C) 2020 ActiveJ LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.activej.promise;

import io.activej.async.callback.Callback;
import org.jetbrains.annotations.Nullable;

public interface SettableCallback extends Callback {
	default void set(T result, @Nullable Exception e) {
		accept(result, e);
	}

	default void set(T result) {
		set(result, null);
	}

	default void setException(Exception e) {
		set(null, e);
	}

	default boolean trySet(T result, @Nullable Exception e) {
		if (isComplete()) return false;
		set(result, e);
		return true;
	}

	default boolean trySet(T result) {
		return trySet(result, null);
	}

	default boolean trySetException(Exception e) {
		return trySet(null, e);
	}

	boolean isComplete();

	@Override
	default void accept(T result, @Nullable Exception e) {
		set(result, e);
	}
}