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/*
 * Copyright 2015, gRPC Authors All rights reserved.
 *
 * Licensed 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 nl.topicus.jdbc.shaded.io.grpc.internal;

import nl.topicus.jdbc.shaded.com.google.common.base.Preconditions;
import nl.topicus.jdbc.shaded.io.grpc.Attributes;
import nl.topicus.jdbc.shaded.io.grpc.NameResolverProvider;
import java.net.URI;

/**
 * A provider for {@link DnsNameResolver}.
 *
 * 

It resolves a target URI whose scheme is {@code "dns"}. The (optional) authority of the target * URI is reserved for the address of alternative DNS server (not implemented yet). The path of the * target URI, excluding the leading slash {@code '/'}, is treated as the host name and the optional * port to be resolved by DNS. Example target URIs: * *

    *
  • {@code "dns:///foo.googleapis.com:8080"} (using default DNS)
  • *
  • {@code "dns://8.8.8.8/foo.googleapis.com:8080"} (using alternative DNS (not implemented * yet))
  • *
  • {@code "dns:///foo.googleapis.com"} (without port)
  • *
*/ public final class DnsNameResolverProvider extends NameResolverProvider { private static final String SCHEME = "dns"; @Override public DnsNameResolver newNameResolver(URI targetUri, Attributes params) { if (SCHEME.equals(targetUri.getScheme())) { String targetPath = Preconditions.checkNotNull(targetUri.getPath(), "targetPath"); Preconditions.checkArgument(targetPath.startsWith("/"), "the path component (%s) of the target (%s) must start with '/'", targetPath, targetUri); String name = targetPath.substring(1); return new DnsNameResolver(targetUri.getAuthority(), name, params, GrpcUtil.TIMER_SERVICE, GrpcUtil.SHARED_CHANNEL_EXECUTOR, GrpcUtil.getProxyDetector()); } else { return null; } } @Override public String getDefaultScheme() { return SCHEME; } @Override protected boolean isAvailable() { return true; } @Override protected int priority() { return 5; } }




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