101 lines
3.0 KiB
Java
101 lines
3.0 KiB
Java
/*
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* Copyright 2014 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 java.util.List;
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import static io.netty.util.internal.ObjectUtil.*;
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/**
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* A skeletal {@link NameResolver} implementation.
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*/
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public abstract class SimpleNameResolver<T> implements NameResolver<T> {
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private final EventExecutor executor;
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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(String)}
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*/
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protected SimpleNameResolver(EventExecutor executor) {
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this.executor = checkNotNull(executor, "executor");
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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(String)}.
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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 final Future<T> resolve(String inetHost) {
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final Promise<T> promise = executor().newPromise();
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return resolve(inetHost, promise);
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}
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@Override
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public Future<T> resolve(String inetHost, Promise<T> promise) {
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checkNotNull(inetHost, "inetHost");
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checkNotNull(promise, "promise");
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try {
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doResolve(inetHost, 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(String inetHost) {
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final Promise<List<T>> promise = executor().newPromise();
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return resolveAll(inetHost, promise);
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}
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@Override
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public Future<List<T>> resolveAll(String inetHost, Promise<List<T>> promise) {
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checkNotNull(inetHost, "inetHost");
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checkNotNull(promise, "promise");
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try {
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doResolveAll(inetHost, 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(String)} to perform the actual name resolution.
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*/
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protected abstract void doResolve(String inetHost, Promise<T> promise) throws Exception;
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/**
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* Invoked by {@link #resolveAll(String)} to perform the actual name resolution.
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*/
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protected abstract void doResolveAll(String inetHost, 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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