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Java example source code file (SimpleNameResolver.java)

This example Java source code file (SimpleNameResolver.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

eventexecutor, exception, future, override, promise, simplenameresolver, util

The SimpleNameResolver.java Java example source code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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.
 */

package io.netty.resolver;

import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.Promise;

import java.util.List;

import static io.netty.util.internal.ObjectUtil.*;

/**
 * A skeletal {@link NameResolver} implementation.
 */
public abstract class SimpleNameResolver<T> implements NameResolver {

    private final EventExecutor executor;

    /**
     * @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
     *                 by {@link #resolve(String)}
     */
    protected SimpleNameResolver(EventExecutor executor) {
        this.executor = checkNotNull(executor, "executor");
    }

    /**
     * Returns the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
     * by {@link #resolve(String)}.
     */
    protected EventExecutor executor() {
        return executor;
    }

    @Override
    public final Future<T> resolve(String inetHost) {
        final Promise<T> promise = executor().newPromise();
        return resolve(inetHost, promise);
    }

    @Override
    public Future<T> resolve(String inetHost, Promise promise) {
        checkNotNull(inetHost, "inetHost");
        checkNotNull(promise, "promise");

        try {
            doResolve(inetHost, promise);
            return promise;
        } catch (Exception e) {
            return promise.setFailure(e);
        }
    }

    @Override
    public final Future<List resolveAll(String inetHost) {
        final Promise<List promise = executor().newPromise();
        return resolveAll(inetHost, promise);
    }

    @Override
    public Future<List resolveAll(String inetHost, Promise> promise) {
        checkNotNull(inetHost, "inetHost");
        checkNotNull(promise, "promise");

        try {
            doResolveAll(inetHost, promise);
            return promise;
        } catch (Exception e) {
            return promise.setFailure(e);
        }
    }

    /**
     * Invoked by {@link #resolve(String)} to perform the actual name resolution.
     */
    protected abstract void doResolve(String inetHost, Promise<T> promise) throws Exception;

    /**
     * Invoked by {@link #resolveAll(String)} to perform the actual name resolution.
     */
    protected abstract void doResolveAll(String inetHost, Promise<List promise) throws Exception;

    @Override
    public void close() { }
}

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