| /* |
| * 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 com.alibaba.dubbo.rpc; |
| |
| import java.util.Map; |
| |
| /** |
| * RPC invoke result. (API, Prototype, NonThreadSafe) |
| * |
| * @serial Don't change the class name and package name. |
| * @see com.alibaba.dubbo.rpc.Invoker#invoke(Invocation) |
| * @see com.alibaba.dubbo.rpc.RpcResult |
| */ |
| public interface Result { |
| |
| /** |
| * Get invoke result. |
| * |
| * @return result. if no result return null. |
| */ |
| Object getValue(); |
| |
| /** |
| * Get exception. |
| * |
| * @return exception. if no exception return null. |
| */ |
| Throwable getException(); |
| |
| /** |
| * Has exception. |
| * |
| * @return has exception. |
| */ |
| boolean hasException(); |
| |
| /** |
| * Recreate. |
| * <p> |
| * <code> |
| * if (hasException()) { |
| * throw getException(); |
| * } else { |
| * return getValue(); |
| * } |
| * </code> |
| * |
| * @return result. |
| * @throws if has exception throw it. |
| */ |
| Object recreate() throws Throwable; |
| |
| /** |
| * @see com.alibaba.dubbo.rpc.Result#getValue() |
| * @deprecated Replace to getValue() |
| */ |
| @Deprecated |
| Object getResult(); |
| |
| |
| /** |
| * get attachments. |
| * |
| * @return attachments. |
| */ |
| Map<String, String> getAttachments(); |
| |
| /** |
| * get attachment by key. |
| * |
| * @return attachment value. |
| */ |
| String getAttachment(String key); |
| |
| /** |
| * get attachment by key with default value. |
| * |
| * @return attachment value. |
| */ |
| String getAttachment(String key, String defaultValue); |
| |
| } |