/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.action;

import org.elasticsearch.action.ActionListener;

import java.util.concurrent.CompletableFuture;
import java.util.function.Function;

public class FutureActionListener<Response, Result> extends CompletableFuture<Result> implements ActionListener<Response> {

    private final Function<? super Response, ? extends Result> transformFunction;

    public static <T> FutureActionListener<T, T> newInstance() {
        return new FutureActionListener<>(Function.identity());
    }

    public FutureActionListener(Function<? super Response, ? extends Result> transformFunction) {
        this.transformFunction = transformFunction;
    }

    @Override
    public void onResponse(Response response) {
        try {
            complete(transformFunction.apply(response));
        } catch (Throwable t) {
            completeExceptionally(t);
        }
    }

    @Override
    public void onFailure(Exception e) {
        completeExceptionally(e);
    }
}