feat: The registration center in config mode supports JSON format. (#1551)

kernel/dynamic/mode/config/src/main/java/cn/hippo4j/threadpool/dynamic/mode/config/parser/ConfigParserHandler.java

@@ -34,6 +34,7 @@ public final class ConfigParserHandler {
         }
         PARSERS.add(new PropertiesConfigParser());
         PARSERS.add(new YamlConfigParser());
+        PARSERS.add(new JsonConfigParser());
     }
 
     public Map<Object, Object> parseConfig(String content, String type) throws IOException {

kernel/dynamic/mode/config/src/main/java/cn/hippo4j/threadpool/dynamic/mode/config/parser/JsonConfigParser.java

@@ -0,0 +1,96 @@
+/*
+ * 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 cn.hippo4j.threadpool.dynamic.mode.config.parser;
+
+import cn.hippo4j.common.toolkit.CollectionUtil;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.commons.collections.MapUtils;
+import org.apache.commons.lang3.StringUtils;
+
+import java.io.IOException;
+import java.util.*;
+
+/**
+ * Json config parser.
+ */
+public class JsonConfigParser extends AbstractConfigParser {
+    private static final ObjectMapper MAPPER;
+    private static final String DOT = ".";
+    private static final String LEFT_BRACE = "{";
+    private static final String RIGHT_BRACE = "{";
+    private static final String LEFT_BRACKET = "[";
+    private static final String RIGHT_BRACKET = "]";
+
+    static {
+        MAPPER = new ObjectMapper();
+    }
+
+    public Map<Object, Object> doParse(String content, String prefix) throws IOException {
+
+        Map<String, Object> originMap = MAPPER.readValue(content, LinkedHashMap.class);
+        Map<Object, Object> result = new HashMap<>();
+
+        flatMap(result, originMap, prefix);
+        return result;
+    }
+
+    private void flatMap(Map<Object, Object> result, Map<String, Object> dataMap, String prefix) {
+
+        if (MapUtils.isEmpty(dataMap)) {
+            return;
+        }
+
+        dataMap.forEach((k, v) -> {
+            String fullKey = genFullKey(prefix, k);
+            if (v instanceof Map) {
+                flatMap(result, (Map<String, Object>) v, fullKey);
+                return;
+            } else if (v instanceof Collection) {
+                int count = 0;
+                for (Object obj : (Collection<Object>) v) {
+                    String kk = LEFT_BRACKET + (count++) + RIGHT_BRACKET;
+                    flatMap(result, Collections.singletonMap(kk, obj), fullKey);
+                }
+                return;
+            }
+
+            result.put(fullKey, v);
+        });
+    }
+
+    private String genFullKey(String prefix, String key) {
+        if (StringUtils.isEmpty(prefix)) {
+            return key;
+        }
+        return key.startsWith(LEFT_BRACE) ? prefix.concat(key) : prefix.concat(DOT).concat(key);
+    }
+
+    @Override
+    public Map<Object, Object> doParse(String content) throws IOException {
+        if (StringUtils.isEmpty(content)) {
+            return new HashMap<>(1);
+        }
+
+        return doParse(content,"");
+    }
+
+    @Override
+    public List<ConfigFileTypeEnum> getConfigFileTypes() {
+        return CollectionUtil.newArrayList(ConfigFileTypeEnum.JSON, ConfigFileTypeEnum.JSON);
+    }
+}