207 lines
6.9 KiB
Java
207 lines
6.9 KiB
Java
/*
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* Copyright 2015 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.resolver;
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import io.netty.util.concurrent.EventExecutor;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.Promise;
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import io.netty.util.internal.TypeParameterMatcher;
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import java.net.SocketAddress;
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import java.nio.channels.UnsupportedAddressTypeException;
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import java.util.Collections;
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import java.util.List;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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/**
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* A skeletal {@link AddressResolver} implementation.
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*/
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public abstract class AbstractAddressResolver<T extends SocketAddress> implements AddressResolver<T> {
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private final EventExecutor executor;
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private final TypeParameterMatcher matcher;
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/**
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* @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
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* by {@link #resolve(SocketAddress)}
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*/
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protected AbstractAddressResolver(EventExecutor executor) {
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this.executor = checkNotNull(executor, "executor");
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matcher = TypeParameterMatcher.find(this, AbstractAddressResolver.class, "T");
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}
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/**
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* @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
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* by {@link #resolve(SocketAddress)}
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* @param addressType the type of the {@link SocketAddress} supported by this resolver
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*/
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protected AbstractAddressResolver(EventExecutor executor, Class<? extends T> addressType) {
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this.executor = checkNotNull(executor, "executor");
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matcher = TypeParameterMatcher.get(addressType);
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}
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/**
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* Returns the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
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* by {@link #resolve(SocketAddress)}.
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*/
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protected EventExecutor executor() {
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return executor;
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}
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@Override
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public boolean isSupported(SocketAddress address) {
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return matcher.match(address);
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}
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@Override
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public final boolean isResolved(SocketAddress address) {
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if (!isSupported(address)) {
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throw new UnsupportedAddressTypeException();
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}
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@SuppressWarnings("unchecked")
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final T castAddress = (T) address;
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return doIsResolved(castAddress);
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}
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/**
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* Invoked by {@link #isResolved(SocketAddress)} to check if the specified {@code address} has been resolved
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* already.
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*/
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protected abstract boolean doIsResolved(T address);
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@Override
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public final Future<T> resolve(SocketAddress address) {
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if (!isSupported(checkNotNull(address, "address"))) {
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// Address type not supported by the resolver
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return executor().newFailedFuture(new UnsupportedAddressTypeException());
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}
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if (isResolved(address)) {
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// Resolved already; no need to perform a lookup
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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return executor.newSucceededFuture(cast);
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}
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try {
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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final Promise<T> promise = executor().newPromise();
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doResolve(cast, promise);
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return promise;
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} catch (Exception e) {
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return executor().newFailedFuture(e);
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}
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}
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@Override
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public final Future<T> resolve(SocketAddress address, Promise<T> promise) {
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checkNotNull(address, "address");
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checkNotNull(promise, "promise");
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if (!isSupported(address)) {
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// Address type not supported by the resolver
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return promise.setFailure(new UnsupportedAddressTypeException());
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}
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if (isResolved(address)) {
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// Resolved already; no need to perform a lookup
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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return promise.setSuccess(cast);
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}
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try {
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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doResolve(cast, promise);
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return promise;
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} catch (Exception e) {
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return promise.setFailure(e);
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}
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}
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@Override
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public final Future<List<T>> resolveAll(SocketAddress address) {
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if (!isSupported(checkNotNull(address, "address"))) {
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// Address type not supported by the resolver
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return executor().newFailedFuture(new UnsupportedAddressTypeException());
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}
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if (isResolved(address)) {
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// Resolved already; no need to perform a lookup
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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return executor.newSucceededFuture(Collections.singletonList(cast));
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}
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try {
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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final Promise<List<T>> promise = executor().newPromise();
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doResolveAll(cast, promise);
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return promise;
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} catch (Exception e) {
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return executor().newFailedFuture(e);
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}
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}
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@Override
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public final Future<List<T>> resolveAll(SocketAddress address, Promise<List<T>> promise) {
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checkNotNull(address, "address");
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checkNotNull(promise, "promise");
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if (!isSupported(address)) {
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// Address type not supported by the resolver
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return promise.setFailure(new UnsupportedAddressTypeException());
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}
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if (isResolved(address)) {
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// Resolved already; no need to perform a lookup
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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return promise.setSuccess(Collections.singletonList(cast));
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}
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try {
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@SuppressWarnings("unchecked")
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final T cast = (T) address;
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doResolveAll(cast, promise);
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return promise;
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} catch (Exception e) {
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return promise.setFailure(e);
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}
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}
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/**
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* Invoked by {@link #resolve(SocketAddress)} to perform the actual name
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* resolution.
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*/
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protected abstract void doResolve(T unresolvedAddress, Promise<T> promise) throws Exception;
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/**
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* Invoked by {@link #resolveAll(SocketAddress)} to perform the actual name
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* resolution.
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*/
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protected abstract void doResolveAll(T unresolvedAddress, Promise<List<T>> promise) throws Exception;
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@Override
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public void close() { }
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}
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