#1550 抽象出 spi 接口

api/src/main/java/com/alibaba/nacos/api/config/listener/ConfigChangeParser.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 1999-2018 Alibaba Group Holding Ltd.
+ *
+ * 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 com.alibaba.nacos.api.config.listener;
+
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * ConfigChangeParser
+ *
+ * @author rushsky518
+ */
+public interface ConfigChangeParser {
+    /**
+     * judge type
+     * @param type
+     * @return
+     */
+    boolean isResponsibleFor(String type);
+
+    /**
+     * compare old and new data
+     * @param oldContent
+     * @param newContent
+     * @param type
+     * @return
+     * @throws IOException
+     */
+    Map<String, Object> doParse(String oldContent, String newContent, String type) throws IOException;
+}

client/src/main/java/com/alibaba/nacos/client/config/impl/AbstractConfigChangeParser.java

@@ -15,8 +15,8 @@
  */
 package com.alibaba.nacos.client.config.impl;
 
-import java.io.IOException;
+import com.alibaba.nacos.api.config.listener.ConfigChangeParser;
-import java.util.Collections;
+
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
@@ -26,50 +26,18 @@ import java.util.Map;
  *
  * @author rushsky518
  */
-public abstract class AbstractConfigChangeParser {
+public abstract class AbstractConfigChangeParser implements ConfigChangeParser {
     private String configType;
 
-    private AbstractConfigChangeParser next;
-
     public AbstractConfigChangeParser(String configType) {
         this.configType = configType;
     }
 
-    public AbstractConfigChangeParser addNext(AbstractConfigChangeParser configChangeParser) {
+    @Override
-        if (null == this.next) {
+    public boolean isResponsibleFor(String type) {
-            this.next = configChangeParser;
-        } else {
-            this.next.addNext(configChangeParser);
-        }
-        return this;
-    }
-
-    protected boolean isResponsibleFor(String type) {
         return this.configType.equalsIgnoreCase(type);
     }
 
-    public Map parseChangeData(String oldContent, String newContent, String type) throws IOException {
-        if (isResponsibleFor(type)) {
-            return this.doParse(oldContent, newContent, type);
-        }
-
-        if (null != this.next) {
-            return this.next.parseChangeData(oldContent, newContent, type);
-        }
-
-        return Collections.emptyMap();
-    }
-
-    /**
-     * parse and compare config data
-     * @param oldContent
-     * @param newContent
-     * @param type
-     * @return
-     * @throws IOException
-     */
-    protected abstract Map<String, Object> doParse(String oldContent, String newContent, String type) throws IOException;
-
     protected Map filterChangeData(Map oldMap, Map newMap) {
         Map<String, ConfigChangeItem> result = new HashMap<String, ConfigChangeItem>(16);
         for (Iterator<Map.Entry<String, Object>> entryItr = oldMap.entrySet().iterator(); entryItr.hasNext();) {

client/src/main/java/com/alibaba/nacos/client/config/impl/CacheData.java

@@ -203,7 +203,7 @@ public class CacheData {
 
                     // compare lastContent and content
                     if (listener instanceof AbstractConfigChangeListener) {
-                        Map data = ConfigChangeHandler.getChangeParserInstance().parseChangeData(listenerWrap.lastContent, content, type);
+                        Map data = ConfigChangeHandler.getInstance().parseChangeData(listenerWrap.lastContent, content, type);
                         ConfigChangeEvent event = new ConfigChangeEvent(data);
                         ((AbstractConfigChangeListener)listener).receiveConfigChange(event);
                         listenerWrap.lastContent = content;

client/src/main/java/com/alibaba/nacos/client/config/impl/ClientWorker.java

@@ -17,6 +17,7 @@ package com.alibaba.nacos.client.config.impl;
 
 import com.alibaba.nacos.api.PropertyKeyConst;
 import com.alibaba.nacos.api.common.Constants;
+import com.alibaba.nacos.api.config.ConfigType;
 import com.alibaba.nacos.api.config.listener.Listener;
 import com.alibaba.nacos.api.exception.NacosException;
 import com.alibaba.nacos.client.config.common.GroupKey;
@@ -248,6 +249,8 @@ public class ClientWorker {
                 ct[0] = result.content;
                 if (result.headers.containsKey(CONFIG_TYPE)) {
                     ct[1] = result.headers.get(CONFIG_TYPE).get(0);
+                } else {
+                    ct[1] = ConfigType.TEXT.getType();
                 }
                 return ct;
             case HttpURLConnection.HTTP_NOT_FOUND:

client/src/main/java/com/alibaba/nacos/client/config/impl/ConfigChangeHandler.java

@@ -15,28 +15,51 @@
  */
 package com.alibaba.nacos.client.config.impl;
 
+import com.alibaba.nacos.api.config.listener.ConfigChangeParser;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.ServiceLoader;
+import java.util.Map;
+
 /**
  * ConfigChangeHandler
  *
  * @author rushsky518
  */
 public class ConfigChangeHandler {
+    private static class ConfigChangeHandlerHolder {
+        private final static ConfigChangeHandler INSTANCE = new ConfigChangeHandler();
+    }
+
     private ConfigChangeHandler() {
-        this.configChangeParser = new PropertiesChangeParser("properties").addNext(new YmlChangeParser("yaml"));
+        this.parserList = new LinkedList<ConfigChangeParser>();
+
+        ServiceLoader<ConfigChangeParser> loader = ServiceLoader.load(ConfigChangeParser.class);
+        if (loader.iterator().hasNext()) {
+            this.parserList.add(loader.iterator().next());
+        }
+
+        this.parserList.add(new PropertiesChangeParser());
+        this.parserList.add(new YmlChangeParser());
     }
 
     public static ConfigChangeHandler getInstance() {
         return ConfigChangeHandlerHolder.INSTANCE;
     }
 
-    public static AbstractConfigChangeParser getChangeParserInstance() {
+    public Map parseChangeData(String oldContent, String newContent, String type) throws IOException {
-        return ConfigChangeHandlerHolder.INSTANCE.configChangeParser;
+        for (ConfigChangeParser changeParser: this.parserList) {
+            if (changeParser.isResponsibleFor(type)) {
+                return changeParser.doParse(oldContent, newContent, type);
+            }
         }
 
-    private static class ConfigChangeHandlerHolder {
+        return Collections.emptyMap();
-        private final static ConfigChangeHandler INSTANCE = new ConfigChangeHandler();
     }
 
-    private AbstractConfigChangeParser configChangeParser;
+    private List<ConfigChangeParser> parserList;
 
 }

client/src/main/java/com/alibaba/nacos/client/config/impl/PropertiesChangeParser.java

@@ -28,13 +28,12 @@ import java.util.Properties;
  * @author rushsky518
  */
 public class PropertiesChangeParser extends AbstractConfigChangeParser {
-
+    public PropertiesChangeParser() {
-    public PropertiesChangeParser(String configType) {
+        super("properties");
-        super(configType);
     }
 
     @Override
-    protected Map doParse(String oldContent, String newContent, String type) throws IOException {
+    public Map doParse(String oldContent, String newContent, String type) throws IOException {
         Properties oldProps = new Properties();
         Properties newProps = new Properties();
 

client/src/main/java/com/alibaba/nacos/client/config/impl/YmlChangeParser.java

@@ -25,13 +25,12 @@ import java.util.*;
  * @author rushsky518
  */
 public class YmlChangeParser extends AbstractConfigChangeParser {
-
+    public YmlChangeParser() {
-    public YmlChangeParser(String configType) {
+        super("yaml");
-        super(configType);
     }
 
     @Override
-    protected Map<String, Object> doParse(String oldContent, String newContent, String type) {
+    public Map<String, Object> doParse(String oldContent, String newContent, String type) {
         Map<String, Object> oldMap = Collections.emptyMap();
         Map<String, Object> newMap = Collections.emptyMap();
 
@@ -88,4 +87,3 @@ public class YmlChangeParser extends AbstractConfigChangeParser {
     }
 
 }
-

config/src/main/java/com/alibaba/nacos/config/server/controller/ConfigServletInner.java

@@ -131,9 +131,7 @@ public class ConfigServletInner {
                         }
                     }
                     String configType = cacheItem.getType();
-                    if (null != configType) {
+                    response.setHeader("Config-Type", (null != configType) ? configType : "text");
-                        response.setHeader("Config-Type", configType);
-                    }
                 }
                 File file = null;
                 ConfigInfoBase configInfoBase = null;