[ISSUE#11659] Develop config query chain of responsibility.

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

@@ -28,6 +28,7 @@
 import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.constant.ParametersField;
 import com.alibaba.nacos.config.server.controller.parameters.SameNamespaceCloneConfigBean;
+import com.alibaba.nacos.config.server.enums.ApiVersionEnum;
 import com.alibaba.nacos.config.server.model.ConfigAdvanceInfo;
 import com.alibaba.nacos.config.server.model.ConfigAllInfo;
 import com.alibaba.nacos.config.server.model.ConfigInfo;
@@ -244,7 +245,7 @@ public void getConfig(HttpServletRequest request, HttpServletResponse response,
 
         final String clientIp = RequestUtil.getRemoteIp(request);
         String isNotify = request.getHeader("notify");
-        inner.doGetConfig(request, response, dataId, group, tenant, tag, isNotify, clientIp);
+        inner.doGetConfig(request, response, dataId, group, tenant, tag, isNotify, clientIp, ApiVersionEnum.V1);
     }
 
     /**

config/src/main/java/com/alibaba/nacos/config/server/controller/v2/ConfigControllerV2.java

@@ -27,6 +27,7 @@
 import com.alibaba.nacos.common.utils.StringUtils;
 import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.controller.ConfigServletInner;
+import com.alibaba.nacos.config.server.enums.ApiVersionEnum;
 import com.alibaba.nacos.config.server.model.ConfigInfo;
 import com.alibaba.nacos.config.server.model.ConfigRequestInfo;
 import com.alibaba.nacos.config.server.paramcheck.ConfigBlurSearchHttpParamExtractor;
@@ -105,7 +106,7 @@ public void getConfig(HttpServletRequest request, HttpServletResponse response,
         ParamUtils.checkParamV2(tag);
         final String clientIp = RequestUtil.getRemoteIp(request);
         String isNotify = request.getHeader("notify");
-        inner.doGetConfig(request, response, dataId, group, namespaceId, tag, isNotify, clientIp, true);
+        inner.doGetConfig(request, response, dataId, group, namespaceId, tag, isNotify, clientIp, ApiVersionEnum.V2);
     }
 
     /**

config/src/main/java/com/alibaba/nacos/config/server/enums/ApiVersionEnum.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 1999-$toady.year 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.config.server.enums;
+
+/**
+ * Config Api Version enum.
+ * @author Nacos
+ */
+public enum ApiVersionEnum {
+
+    V1("v1"),
+
+    V2("v2");
+
+    private final String version;
+
+    ApiVersionEnum(String version) {
+        this.version = version;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+}

config/src/main/java/com/alibaba/nacos/config/server/model/ConfigQueryChainRequest.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright 1999-$toady.year 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.config.server.model;
+
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * ConfigQueryChainRequest.
+ * @author Nacos
+ */
+public class ConfigQueryChainRequest {
+
+    private String dataId;
+
+    private String group;
+
+    private String tenant;
+
+    private String tag;
+
+    private Map<String, String> appLabels;
+
+    public String getDataId() {
+        return dataId;
+    }
+
+    public void setDataId(String dataId) {
+        this.dataId = dataId;
+    }
+
+    public String getGroup() {
+        return group;
+    }
+
+    public void setGroup(String group) {
+        this.group = group;
+    }
+
+    public String getTenant() {
+        return tenant;
+    }
+
+    public void setTenant(String tenant) {
+        this.tenant = tenant;
+    }
+
+    public String getTag() {
+        return tag;
+    }
+
+    public void setTag(String tag) {
+        this.tag = tag;
+    }
+
+    public Map<String, String> getAppLabels() {
+        return appLabels;
+    }
+
+    public void setAppLabels(Map<String, String> appLabels) {
+        this.appLabels = appLabels;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        ConfigQueryChainRequest that = (ConfigQueryChainRequest) o;
+        return Objects.equals(dataId, that.dataId)
+                && Objects.equals(group, that.group)
+                && Objects.equals(tenant, that.tenant)
+                && Objects.equals(tag, that.tag)
+                && Objects.equals(appLabels, that.appLabels);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(dataId, group, tenant, tag, appLabels);
+    }
+}

config/src/main/java/com/alibaba/nacos/config/server/model/ConfigQueryChainResponse.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright 1999-$toady.year 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.config.server.model;
+
+import java.util.Objects;
+
+/**
+ * ConfigQueryChainResponse.
+ * @author Nacos
+ */
+public class ConfigQueryChainResponse {
+
+    private String content;
+
+    private String contentType;
+
+    private String encryptedDataKey;
+
+    private String md5;
+
+    private long lastModified;
+
+    private ConfigCacheGray matchedGray;
+
+    private ConfigQueryStatus status;
+
+    public enum ConfigQueryStatus {
+        BETA,
+        TAG,
+        TAG_NOT_FOUND,
+        FORMAL,
+        CONFIG_QUERY_CONFLICT,
+        CONFIG_NOT_FOUND,
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public String getContentType() {
+        return contentType;
+    }
+
+    public void setContentType(String contentType) {
+        this.contentType = contentType;
+    }
+
+    public String getEncryptedDataKey() {
+        return encryptedDataKey;
+    }
+
+    public void setEncryptedDataKey(String encryptedDataKey) {
+        this.encryptedDataKey = encryptedDataKey;
+    }
+
+    public String getMd5() {
+        return md5;
+    }
+
+    public void setMd5(String md5) {
+        this.md5 = md5;
+    }
+
+    public long getLastModified() {
+        return lastModified;
+    }
+
+    public void setLastModified(long lastModified) {
+        this.lastModified = lastModified;
+    }
+
+    public ConfigCacheGray getMatchedGray() {
+        return matchedGray;
+    }
+
+    public void setMatchedGray(ConfigCacheGray matchedGray) {
+        this.matchedGray = matchedGray;
+    }
+
+    public ConfigQueryStatus getStatus() {
+        return status;
+    }
+
+    public void setStatus(ConfigQueryStatus status) {
+        this.status = status;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        ConfigQueryChainResponse that = (ConfigQueryChainResponse) o;
+        return lastModified == that.lastModified
+                && Objects.equals(content, that.content)
+                && Objects.equals(contentType, that.contentType)
+                && Objects.equals(encryptedDataKey, that.encryptedDataKey)
+                && Objects.equals(md5, that.md5)
+                && Objects.equals(matchedGray, that.matchedGray)
+                && status == that.status;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(content, contentType, encryptedDataKey, md5, lastModified, matchedGray, status);
+    }
+}