init

sentinel/sentinel-demo/sentinel-demo-annotation-cdi-interceptor/src/main/java/com/alibaba/csp/sentinel/demo/annotation/cdi/interceptor/DemoApplication.java

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+/*
+ * 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.demo.annotation.cdi.interceptor;
+
+import javax.enterprise.inject.se.SeContainer;
+import javax.enterprise.inject.se.SeContainerInitializer;
+
+/**
+ * @author sea
+ */
+public class DemoApplication {
+
+    public static void main(String[] args) {
+        SeContainerInitializer containerInit = SeContainerInitializer.newInstance();
+        SeContainer container = containerInit.initialize();
+
+        TestService testService = container.select(TestService.class).get();
+
+        testService.test();
+
+        System.out.println(testService.hello(-1));
+        System.out.println(testService.hello(1));
+
+        System.out.println(testService.helloAnother("bad"));
+
+        try {
+            System.out.println(testService.helloAnother("foo"));
+        } catch (IllegalStateException e) {
+            System.err.println(e.getMessage());
+        }
+
+        System.out.println(testService.helloAnother("weld"));
+
+        container.close();
+        System.exit(0);
+    }
+}

sentinel/sentinel-demo/sentinel-demo-annotation-cdi-interceptor/src/main/java/com/alibaba/csp/sentinel/demo/annotation/cdi/interceptor/ExceptionUtil.java

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+/*
+ * 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
+ *
+ *      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.annotation.cdi.interceptor;
+
+import com.alibaba.csp.sentinel.slots.block.BlockException;
+
+/**
+ * @author Eric Zhao
+ */
+public final class ExceptionUtil {
+
+    public static void handleException(BlockException ex) {
+        // Handler method that handles BlockException when blocked.
+        // The method parameter list should match original method, with the last additional
+        // parameter with type BlockException. The return type should be same as the original method.
+        // The block handler method should be located in the same class with original method by default.
+        // If you want to use method in other classes, you can set the blockHandlerClass
+        // with corresponding Class (Note the method in other classes must be static).
+        System.out.println("Oops: " + ex.getClass().getCanonicalName());
+    }
+}

sentinel/sentinel-demo/sentinel-demo-annotation-cdi-interceptor/src/main/java/com/alibaba/csp/sentinel/demo/annotation/cdi/interceptor/TestService.java

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+/*
+ * 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
+ *
+ *      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.annotation.cdi.interceptor;
+
+/**
+ * @author Eric Zhao
+ */
+public interface TestService {
+
+    void test();
+
+    String hello(long s);
+
+    String helloAnother(String name);
+}

sentinel/sentinel-demo/sentinel-demo-annotation-cdi-interceptor/src/main/java/com/alibaba/csp/sentinel/demo/annotation/cdi/interceptor/TestServiceImpl.java

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+/*
+ * 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
+ *
+ *      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.annotation.cdi.interceptor;
+
+import com.alibaba.csp.sentinel.annotation.cdi.interceptor.SentinelResourceBinding;
+import javax.enterprise.context.ApplicationScoped;
+
+
+/**
+ * @author Eric Zhao
+ */
+@ApplicationScoped
+public class TestServiceImpl implements TestService {
+
+    @Override
+    @SentinelResourceBinding(value = "test", blockHandler = "handleException", blockHandlerClass = {ExceptionUtil.class})
+    public void test() {
+        System.out.println("Test");
+    }
+
+    @Override
+    @SentinelResourceBinding(value = "hello", fallback = "helloFallback")
+    public String hello(long s) {
+        if (s < 0) {
+            throw new IllegalArgumentException("invalid arg");
+        }
+        return String.format("Hello at %d", s);
+    }
+
+    @Override
+    @SentinelResourceBinding(value = "helloAnother", defaultFallback = "defaultFallback",
+        exceptionsToIgnore = {IllegalStateException.class})
+    public String helloAnother(String name) {
+        if (name == null || "bad".equals(name)) {
+            throw new IllegalArgumentException("oops");
+        }
+        if ("foo".equals(name)) {
+            throw new IllegalStateException("oops");
+        }
+        return "Hello, " + name;
+    }
+
+    public String helloFallback(long s, Throwable ex) {
+        // Do some log here.
+        return "Oops, error occurred at " + s + ", msg:" + ex.getMessage();
+    }
+
+    public String defaultFallback() {
+        System.out.println("Go to default fallback");
+        return "default_fallback";
+    }
+}

sentinel/sentinel-demo/sentinel-demo-annotation-cdi-interceptor/src/main/resources/META-INF/beans.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
+       bean-discovery-mode="all">
+    <interceptors>
+        <class>com.alibaba.csp.sentinel.annotation.cdi.interceptor.SentinelResourceInterceptor</class>
+    </interceptors>
+</beans>