- Make java.util.Date/java.sql.Date is serialized as long (millisecon…

…ds) in gson

- Update sentinel-demo-cluster-server-alone to demonstrate an example using fastjson in serialization

sentinel-demo/sentinel-demo-cluster/sentinel-demo-cluster-server-alone/README.md

@@ -0,0 +1,7 @@
+# sentinel-demo-cluster-server-alone
+
+Demo of standalone sentinel cluster mode.
+
+## Special
+
+It also demonstrate usage of `sentinel-serialization` with `fastjson` library only.

sentinel-demo/sentinel-demo-cluster/sentinel-demo-cluster-server-alone/pom.xml

@@ -19,6 +19,12 @@
         <dependency>
             <groupId>com.alibaba.csp</groupId>
             <artifactId>sentinel-transport-simple-http</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>com.google.code.gson</groupId>
+                    <artifactId>gson</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>com.alibaba.csp</groupId>

sentinel-serialization/sentinel-serialization-common/src/main/java/com/alibaba/csp/sentinel/serialization/common/fallback/DateTypeAdapter.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 1999-2020 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
+ *
+ *      https://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.csp.sentinel.serialization.common.fallback;
+
+import java.lang.reflect.Type;
+import java.util.Date;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+class DateTypeAdapter implements JsonSerializer<Date>, JsonDeserializer<Date> {
+
+    @Override
+    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+            throws JsonParseException {
+        if (typeOfT == java.sql.Date.class) {
+            return new java.sql.Date(json.getAsLong());
+        }
+        return new Date(json.getAsLong());
+    }
+
+    @Override
+    public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
+        return new JsonPrimitive(src.getTime());
+    }
+
+}

sentinel-serialization/sentinel-serialization-common/src/main/java/com/alibaba/csp/sentinel/serialization/common/fallback/GsonAdaption.java

@@ -44,7 +44,7 @@ private static boolean check() {
                 actualVersionStr = String.valueOf(versionField.get(mainClass));
             } catch (Exception e) {
             }
-            INSTANCE = mainClass.newInstance();
+            INSTANCE = GsonFactory.create();
             METHOD_TO_JSON_STRING = mainClass.getDeclaredMethod("toJson", Object.class);
             METHOD_PARSE_OBJECT_BY_TYPE = mainClass.getDeclaredMethod("fromJson", String.class, Type.class);
             METHOD_PARSE_OBJECT_BY_CLASS = mainClass.getDeclaredMethod("fromJson", String.class, Object.class.getClass());

sentinel-serialization/sentinel-serialization-common/src/main/java/com/alibaba/csp/sentinel/serialization/common/fallback/GsonFactory.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 1999-2020 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
+ *
+ *      https://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.csp.sentinel.serialization.common.fallback;
+
+import java.util.Date;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+/**
+ * Used to create a shared Gson instance.
+ * <p>
+ * Compared to default one:
+ * <pre>
+ * - Make sure {@link java.util.Date} and {@link java.sql.Date} 
+ *   are serialized as milliseconds
+ * </pre>
+ * 
+ * @author jason
+ *
+ */
+class GsonFactory {
+    public static Gson create() {
+        GsonBuilder builder = new GsonBuilder();
+        builder.registerTypeAdapter(Date.class, new DateTypeAdapter());
+        builder.registerTypeAdapter(java.sql.Date.class, new DateTypeAdapter());
+        return builder.create();
+    }
+}