| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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 |
| * |
| * 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 org.apache.hadoop.registry.client.types; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.registry.client.binding.JsonSerDeser; |
| import org.apache.hadoop.registry.client.binding.RegistryTypeUtils; |
| import org.codehaus.jackson.annotate.JsonIgnoreProperties; |
| import org.codehaus.jackson.map.annotate.JsonSerialize; |
| |
| import java.net.URI; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Description of a single service/component endpoint. |
| * It is designed to be marshalled as JSON. |
| * <p> |
| * Every endpoint can have more than one address entry, such as |
| * a list of URLs to a replicated service, or a (hostname, port) |
| * pair. Each of these address entries is represented as a string list, |
| * as that is the only reliably marshallable form of a tuple JSON can represent. |
| * |
| * |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| @JsonIgnoreProperties(ignoreUnknown = true) |
| @JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL) |
| public final class Endpoint implements Cloneable { |
| |
| /** |
| * API implemented at the end of the binding |
| */ |
| public String api; |
| |
| /** |
| * Type of address. The standard types are defined in |
| * {@link AddressTypes} |
| */ |
| public String addressType; |
| |
| /** |
| * Protocol type. Some standard types are defined in |
| * {@link ProtocolTypes} |
| */ |
| public String protocolType; |
| |
| /** |
| * a list of address tuples —tuples whose format depends on the address type |
| */ |
| public List<Map<String, String>> addresses; |
| |
| /** |
| * Create an empty instance. |
| */ |
| public Endpoint() { |
| } |
| |
| /** |
| * Create an endpoint from another endpoint. |
| * This is a deep clone with a new list of addresses. |
| * @param that the endpoint to copy from |
| */ |
| public Endpoint(Endpoint that) { |
| this.api = that.api; |
| this.addressType = that.addressType; |
| this.protocolType = that.protocolType; |
| this.addresses = newAddresses(that.addresses.size()); |
| for (Map<String, String> address : that.addresses) { |
| Map<String, String> addr2 = new HashMap<String, String>(address.size()); |
| addr2.putAll(address); |
| addresses.add(addr2); |
| } |
| } |
| |
| /** |
| * Build an endpoint with a list of addresses |
| * @param api API name |
| * @param addressType address type |
| * @param protocolType protocol type |
| * @param addrs addresses |
| */ |
| public Endpoint(String api, |
| String addressType, |
| String protocolType, |
| List<Map<String, String>> addrs) { |
| this.api = api; |
| this.addressType = addressType; |
| this.protocolType = protocolType; |
| this.addresses = newAddresses(0); |
| if (addrs != null) { |
| addresses.addAll(addrs); |
| } |
| } |
| |
| /** |
| * Build an endpoint with an empty address list |
| * @param api API name |
| * @param addressType address type |
| * @param protocolType protocol type |
| */ |
| public Endpoint(String api, |
| String addressType, |
| String protocolType) { |
| this.api = api; |
| this.addressType = addressType; |
| this.protocolType = protocolType; |
| this.addresses = newAddresses(0); |
| } |
| |
| /** |
| * Build an endpoint with a single address entry. |
| * <p> |
| * This constructor is superfluous given the varags constructor is equivalent |
| * for a single element argument. However, type-erasure in java generics |
| * causes javac to warn about unchecked generic array creation. This |
| * constructor, which represents the common "one address" case, does |
| * not generate compile-time warnings. |
| * @param api API name |
| * @param addressType address type |
| * @param protocolType protocol type |
| * @param addr address. May be null —in which case it is not added |
| */ |
| public Endpoint(String api, |
| String addressType, |
| String protocolType, |
| Map<String, String> addr) { |
| this(api, addressType, protocolType); |
| if (addr != null) { |
| addresses.add(addr); |
| } |
| } |
| |
| /** |
| * Build an endpoint with a list of addresses |
| * @param api API name |
| * @param addressType address type |
| * @param protocolType protocol type |
| * @param addrs addresses. Null elements will be skipped |
| */ |
| public Endpoint(String api, |
| String addressType, |
| String protocolType, |
| Map<String, String>...addrs) { |
| this(api, addressType, protocolType); |
| for (Map<String, String> addr : addrs) { |
| if (addr!=null) { |
| addresses.add(addr); |
| } |
| } |
| } |
| |
| /** |
| * Create a new address structure of the requested size |
| * @param size size to create |
| * @return the new list |
| */ |
| private List<Map<String, String>> newAddresses(int size) { |
| return new ArrayList<Map<String, String>>(size); |
| } |
| |
| /** |
| * Build an endpoint from a list of URIs; each URI |
| * is ASCII-encoded and added to the list of addresses. |
| * @param api API name |
| * @param protocolType protocol type |
| * @param uris URIs to convert to a list of tup;les |
| */ |
| public Endpoint(String api, |
| String protocolType, |
| URI... uris) { |
| this.api = api; |
| this.addressType = AddressTypes.ADDRESS_URI; |
| |
| this.protocolType = protocolType; |
| List<Map<String, String>> addrs = newAddresses(uris.length); |
| for (URI uri : uris) { |
| addrs.add(RegistryTypeUtils.uri(uri.toString())); |
| } |
| this.addresses = addrs; |
| } |
| |
| @Override |
| public String toString() { |
| return marshalToString.toString(this); |
| } |
| |
| /** |
| * Validate the record by checking for null fields and other invalid |
| * conditions |
| * @throws NullPointerException if a field is null when it |
| * MUST be set. |
| * @throws RuntimeException on invalid entries |
| */ |
| public void validate() { |
| Preconditions.checkNotNull(api, "null API field"); |
| Preconditions.checkNotNull(addressType, "null addressType field"); |
| Preconditions.checkNotNull(protocolType, "null protocolType field"); |
| Preconditions.checkNotNull(addresses, "null addresses field"); |
| for (Map<String, String> address : addresses) { |
| Preconditions.checkNotNull(address, "null element in address"); |
| } |
| } |
| |
| /** |
| * Shallow clone: the lists of addresses are shared |
| * @return a cloned instance |
| * @throws CloneNotSupportedException |
| */ |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| return super.clone(); |
| } |
| |
| |
| /** |
| * Static instance of service record marshalling |
| */ |
| private static class Marshal extends JsonSerDeser<Endpoint> { |
| private Marshal() { |
| super(Endpoint.class); |
| } |
| } |
| |
| private static final Marshal marshalToString = new Marshal(); |
| } |