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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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 2016 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.dns;

import io.netty.resolver.NameResolver;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.Promise;
import io.netty.util.internal.StringUtil;

import java.util.List;
import java.util.concurrent.ConcurrentMap;

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

// FIXME(trustin): Find a better name and move it to the 'resolver' module.
final class InflightNameResolver implements NameResolver {

    private final EventExecutor executor;
    private final NameResolver delegate;
    private final ConcurrentMap> resolvesInProgress;
    private final ConcurrentMap>> resolveAllsInProgress;

    InflightNameResolver(EventExecutor executor, NameResolver delegate,
                         ConcurrentMap> resolvesInProgress,
                         ConcurrentMap>> resolveAllsInProgress) {

        this.executor = checkNotNull(executor, "executor");
        this.delegate = checkNotNull(delegate, "delegate");
        this.resolvesInProgress = checkNotNull(resolvesInProgress, "resolvesInProgress");
        this.resolveAllsInProgress = checkNotNull(resolveAllsInProgress, "resolveAllsInProgress");
    }

    @Override
    public Future resolve(String inetHost) {
        return resolve(inetHost, executor.newPromise());
    }

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

    @Override
    public void close() {
        delegate.close();
    }

    @Override
    public Promise resolve(String inetHost, Promise promise) {
        return resolve(resolvesInProgress, inetHost, promise, false);
    }

    @Override
    public Promise> resolveAll(String inetHost, Promise> promise) {
        return resolve(resolveAllsInProgress, inetHost, promise, true);
    }

    private  Promise resolve(
            final ConcurrentMap> resolveMap,
            final String inetHost, final Promise promise, boolean resolveAll) {

        final Promise earlyPromise = resolveMap.putIfAbsent(inetHost, promise);
        if (earlyPromise != null) {
            // Name resolution for the specified inetHost is in progress already.
            if (earlyPromise.isDone()) {
                transferResult(earlyPromise, promise);
            } else {
                earlyPromise.addListener(new FutureListener() {
                    @Override
                    public void operationComplete(Future f) throws Exception {
                        transferResult(f, promise);
                    }
                });
            }
        } else {
            try {
                if (resolveAll) {
                    @SuppressWarnings("unchecked")
                    final Promise> castPromise = (Promise>) promise; // U is List
                    delegate.resolveAll(inetHost, castPromise);
                } else {
                    @SuppressWarnings("unchecked")
                    final Promise castPromise = (Promise) promise; // U is T
                    delegate.resolve(inetHost, castPromise);
                }
            } finally {
                if (promise.isDone()) {
                    resolveMap.remove(inetHost);
                } else {
                    promise.addListener(new FutureListener() {
                        @Override
                        public void operationComplete(Future f) throws Exception {
                            resolveMap.remove(inetHost);
                        }
                    });
                }
            }
        }

        return promise;
    }

    private static  void transferResult(Future src, Promise dst) {
        if (src.isSuccess()) {
            dst.trySuccess(src.getNow());
        } else {
            dst.tryFailure(src.cause());
        }
    }

    @Override
    public String toString() {
        return StringUtil.simpleClassName(this) + '(' + delegate + ')';
    }
}