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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 2015 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 io.netty.util.internal.TypeParameterMatcher;

import java.net.SocketAddress;
import java.nio.channels.UnsupportedAddressTypeException;
import java.util.Collections;
import java.util.List;

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

/**
 * A skeletal {@link AddressResolver} implementation.
 */
public abstract class AbstractAddressResolver implements AddressResolver {

    private final EventExecutor executor;
    private final TypeParameterMatcher matcher;

    /**
     * @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
     *                 by {@link #resolve(SocketAddress)}
     */
    protected AbstractAddressResolver(EventExecutor executor) {
        this.executor = checkNotNull(executor, "executor");
        this.matcher = TypeParameterMatcher.find(this, AbstractAddressResolver.class, "T");
    }

    /**
     * @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
     *                 by {@link #resolve(SocketAddress)}
     * @param addressType the type of the {@link SocketAddress} supported by this resolver
     */
    protected AbstractAddressResolver(EventExecutor executor, Class addressType) {
        this.executor = checkNotNull(executor, "executor");
        this.matcher = TypeParameterMatcher.get(addressType);
    }

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

    @Override
    public boolean isSupported(SocketAddress address) {
        return matcher.match(address);
    }

    @Override
    public final boolean isResolved(SocketAddress address) {
        if (!isSupported(address)) {
            throw new UnsupportedAddressTypeException();
        }

        @SuppressWarnings("unchecked")
        final T castAddress = (T) address;
        return doIsResolved(castAddress);
    }

    /**
     * Invoked by {@link #isResolved(SocketAddress)} to check if the specified {@code address} has been resolved
     * already.
     */
    protected abstract boolean doIsResolved(T address);

    @Override
    public final Future resolve(SocketAddress address) {
        if (!isSupported(checkNotNull(address, "address"))) {
            // Address type not supported by the resolver
            return executor().newFailedFuture(new UnsupportedAddressTypeException());
        }

        if (isResolved(address)) {
            // Resolved already; no need to perform a lookup
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            return executor.newSucceededFuture(cast);
        }

        try {
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            final Promise promise = executor().newPromise();
            doResolve(cast, promise);
            return promise;
        } catch (Exception e) {
            return executor().newFailedFuture(e);
        }
    }

    @Override
    public final Future resolve(SocketAddress address, Promise promise) {
        checkNotNull(address, "address");
        checkNotNull(promise, "promise");

        if (!isSupported(address)) {
            // Address type not supported by the resolver
            return promise.setFailure(new UnsupportedAddressTypeException());
        }

        if (isResolved(address)) {
            // Resolved already; no need to perform a lookup
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            return promise.setSuccess(cast);
        }

        try {
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            doResolve(cast, promise);
            return promise;
        } catch (Exception e) {
            return promise.setFailure(e);
        }
    }

    @Override
    public final Future> resolveAll(SocketAddress address) {
        if (!isSupported(checkNotNull(address, "address"))) {
            // Address type not supported by the resolver
            return executor().newFailedFuture(new UnsupportedAddressTypeException());
        }

        if (isResolved(address)) {
            // Resolved already; no need to perform a lookup
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            return executor.newSucceededFuture(Collections.singletonList(cast));
        }

        try {
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            final Promise> promise = executor().newPromise();
            doResolveAll(cast, promise);
            return promise;
        } catch (Exception e) {
            return executor().newFailedFuture(e);
        }
    }

    @Override
    public final Future> resolveAll(SocketAddress address, Promise> promise) {
        checkNotNull(address, "address");
        checkNotNull(promise, "promise");

        if (!isSupported(address)) {
            // Address type not supported by the resolver
            return promise.setFailure(new UnsupportedAddressTypeException());
        }

        if (isResolved(address)) {
            // Resolved already; no need to perform a lookup
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            return promise.setSuccess(Collections.singletonList(cast));
        }

        try {
            @SuppressWarnings("unchecked")
            final T cast = (T) address;
            doResolveAll(cast, promise);
            return promise;
        } catch (Exception e) {
            return promise.setFailure(e);
        }
    }

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

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

    @Override
    public void close() { }
}