| /* |
| * 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.dubbo.common; |
| |
| import java.lang.annotation.Documented; |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * Marker for extension interface |
| * <p/> |
| * Changes on extension configuration file <br/> |
| * Use <code>Protocol</code> as an example, its configuration file 'META-INF/dubbo/com.xxx.Protocol' is changes from: <br/> |
| * <pre> |
| * com.foo.XxxProtocol |
| * com.foo.YyyProtocol |
| * </pre> |
| * <p> |
| * to key-value pair <br/> |
| * <pre> |
| * xxx=com.foo.XxxProtocol |
| * yyy=com.foo.YyyProtocol |
| * </pre> |
| * <br/> |
| * The reason for this change is: |
| * <p> |
| * If there's third party library referenced by static field or by method in extension implementation, its class will |
| * fail to initialize if the third party library doesn't exist. In this case, dubbo cannot figure out extension's id |
| * therefore cannot be able to map the exception information with the extension, if the previous format is used. |
| * <p/> |
| * For example: |
| * <p> |
| * Fails to load Extension("mina"). When user configure to use mina, dubbo will complain the extension cannot be loaded, |
| * instead of reporting which extract extension implementation fails and the extract reason. |
| * </p> |
| * |
| * @deprecated because it's too general, switch to use {@link org.apache.dubbo.common.extension.SPI} |
| */ |
| @Deprecated |
| @Documented |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.TYPE}) |
| public @interface Extension { |
| |
| /** |
| * @deprecated |
| */ |
| @Deprecated |
| String value() default ""; |
| |
| } |