init

sentinel/sentinel-demo/sentinel-demo-command-handler/pom.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>sentinel-demo</artifactId>
+        <groupId>com.alibaba.csp</groupId>
+        <version>1.8.3</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>sentinel-demo-command-handler</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.alibaba.csp</groupId>
+            <artifactId>sentinel-transport-simple-http</artifactId>
+        </dependency>
+    </dependencies>
+</project>

sentinel/sentinel-demo/sentinel-demo-command-handler/src/main/java/com/alibaba/csp/sentinel/demo/commandhandler/CommandDemo.java

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+/*
+ * Copyright 1999-2019 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.csp.sentinel.demo.commandhandler;
+
+import com.alibaba.csp.sentinel.init.InitExecutor;
+
+/**
+ * <p>To run this demo, we need to add the {@code sentinel-transport-simple-http} dependency.</p>
+ * <p>
+ * As soon as the CommandCenter has been initialized, we can visit {@code http://ip:commandPort/api}
+ * to see all available command APIs (by default the port is 8719).
+ * We can also visit our customized {@code /echo} command.
+ * </p>
+ *
+ * @author Eric Zhao
+ */
+public class CommandDemo {
+
+    public static void main(String[] args) {
+        // Only for demo. You don't have to do this in your application.
+        InitExecutor.doInit();
+
+        System.out.println("Sentinel CommandCenter has been initialized");
+    }
+}

sentinel/sentinel-demo/sentinel-demo-command-handler/src/main/java/com/alibaba/csp/sentinel/demo/commandhandler/EchoCommandHandler.java

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+/*
+ * Copyright 1999-2019 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.csp.sentinel.demo.commandhandler;
+
+import com.alibaba.csp.sentinel.command.CommandHandler;
+import com.alibaba.csp.sentinel.command.CommandRequest;
+import com.alibaba.csp.sentinel.command.CommandResponse;
+import com.alibaba.csp.sentinel.command.annotation.CommandMapping;
+
+/**
+ * This class is a demo shows how to create and register a customized CommandHandler.
+ *
+ * <ul>
+ * <li>1. Create a class which implements the {@link CommandHandler} SPI interface</li>
+ * <li>2. Use a {@link CommandMapping} to specify the url and desc of your CommandHandler</li>
+ * <li>3. Implement your own {@code handle} method </li>
+ * <li>4. Add your CommandHandler in {@code com.alibaba.csp.sentinel.command.CommandHandler} file which is stored in
+ * {@code resources/META-INF/services/} directory </li>
+ * </ul>
+ *
+ * @author houyi
+ */
+@CommandMapping(name = "echo", desc = "echo command for demo")
+public class EchoCommandHandler implements CommandHandler<String> {
+
+    @Override
+    public CommandResponse<String> handle(CommandRequest request) {
+        String name = request.getParam("name");
+        if (name == null || name.trim().length() == 0) {
+            return CommandResponse.ofSuccess("Tell us what's your name by submit a name parameter");
+        }
+        return CommandResponse.ofSuccess("Hello: " + name);
+    }
+
+}

sentinel/sentinel-demo/sentinel-demo-command-handler/src/main/resources/META-INF/services/com.alibaba.csp.sentinel.command.CommandHandler

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+com.alibaba.csp.sentinel.demo.commandhandler.EchoCommandHandler