io.atomix.vertx.VertxFutures.java Source code

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Here is the source code for io.atomix.vertx.VertxFutures.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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.atomix.vertx;

import io.atomix.catalyst.util.Assert;
import io.vertx.core.AsyncResult;
import io.vertx.core.Context;
import io.vertx.core.Future;
import io.vertx.core.Handler;

import java.util.function.BiConsumer;
import java.util.function.Function;

/**
 * Vert.x future utilities.
 *
 * @author <a href="http://github.com/kuujo>Jordan Halterman</a>
 */
final class VertxFutures {

    private VertxFutures() {
    }

    /**
     * Wraps a void Vert.x handler.
     */
    static <T> BiConsumer<T, Throwable> voidHandler(Handler<AsyncResult<Void>> handler, Context context) {
        Assert.notNull(handler, "handler");
        Assert.notNull(context, "context");
        return (result, error) -> {
            if (error == null) {
                context.runOnContext(v -> Future.<Void>succeededFuture().setHandler(handler));
            } else {
                context.runOnContext(v -> Future.<Void>failedFuture(error).setHandler(handler));
            }
        };
    }

    /**
     * Wraps a Vert.x handler.
     */
    static <T> BiConsumer<T, Throwable> resultHandler(Handler<AsyncResult<T>> handler, Context context) {
        Assert.notNull(handler, "handler");
        Assert.notNull(context, "context");
        return (result, error) -> {
            if (error == null) {
                context.runOnContext(v -> Future.succeededFuture(result).setHandler(handler));
            } else {
                context.runOnContext(v -> Future.<T>failedFuture(error).setHandler(handler));
            }
        };
    }

    /**
     * Converts a return value.
     */
    static <T, U> BiConsumer<T, Throwable> convertHandler(Handler<AsyncResult<U>> handler, Function<T, U> converter,
            Context context) {
        return (result, error) -> {
            if (error == null) {
                context.runOnContext(v -> Future.succeededFuture(converter.apply(result)).setHandler(handler));
            } else {
                context.runOnContext(v -> Future.<U>failedFuture(error).setHandler(handler));
            }
        };
    }

}