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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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:
 *
 *   https://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 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 resolve(String inetHost) {
        final Promise promise = executor().newPromise();
        return resolve(inetHost, promise);
    }

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

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

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

    @Override
    public Future> resolveAll(String inetHost, Promise> promise) {
        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 promise) throws Exception;

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

    @Override
    public void close() { }
}