io.netty.resolver.AddressResolverGroup Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

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).

There is a newer version: 34.0.0.Final

Show newest version

/*
 * 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.FutureListener;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.io.Closeable;
import java.net.SocketAddress;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentMap;

/**
 * Creates and manages {@link NameResolver}s so that each {@link EventExecutor} has its own resolver instance.
 */
public abstract class AddressResolverGroup implements Closeable {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(AddressResolverGroup.class);

    /**
     * Note that we do not use a {@link ConcurrentMap} here because it is usually expensive to instantiate a resolver.
     */
    private final Map> resolvers =
            new IdentityHashMap>();

    private final Map>> executorTerminationListeners =
            new IdentityHashMap>>();

    protected AddressResolverGroup() { }

    /**
     * Returns the {@link AddressResolver} associated with the specified {@link EventExecutor}. If there's no associated
     * resolver found, this method creates and returns a new resolver instance created by
     * {@link #newResolver(EventExecutor)} so that the new resolver is reused on another
     * {@code #getResolver(EventExecutor)} call with the same {@link EventExecutor}.
     */
    public AddressResolver getResolver(final EventExecutor executor) {
        ObjectUtil.checkNotNull(executor, "executor");

        if (executor.isShuttingDown()) {
            throw new IllegalStateException("executor not accepting a task");
        }

        AddressResolver r;
        synchronized (resolvers) {
            r = resolvers.get(executor);
            if (r == null) {
                final AddressResolver newResolver;
                try {
                    newResolver = newResolver(executor);
                } catch (Exception e) {
                    throw new IllegalStateException("failed to create a new resolver", e);
                }

                resolvers.put(executor, newResolver);

                final FutureListener