[GitHub] WillemJiang commented on a change in pull request #100: [SCB-100] async support

[GitBox <gi...@apache.org>]

WillemJiang commented on a change in pull request #100: [SCB-100] async support
URL: https://github.com/apache/incubator-servicecomb-saga/pull/100#discussion_r159586912
 
 

 ##########
 File path: omega/omega-spring-tx/src/main/java/org/apache/servicecomb/saga/omega/transaction/spring/ExecutorFieldCallback.java
 ##########
 @@ -0,0 +1,167 @@
+/*
+ * 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 org.apache.servicecomb.saga.omega.transaction.spring;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.Collection;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executor;
+import java.util.stream.Collectors;
+
+import org.apache.servicecomb.saga.omega.context.OmegaContext;
+import org.apache.servicecomb.saga.omega.transaction.spring.annotations.OmegaContextAware;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.util.ReflectionUtils;
+import org.springframework.util.ReflectionUtils.FieldCallback;
+
+class ExecutorFieldCallback implements FieldCallback {
+  private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  private final OmegaContext omegaContext;
+  private final Object bean;
+
+  ExecutorFieldCallback(Object bean, OmegaContext omegaContext) {
+    this.omegaContext = omegaContext;
+    this.bean = bean;
+  }
+
+  @Override
+  public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
+    if (!field.isAnnotationPresent(OmegaContextAware.class)) {
+      return;
+    }
+
+    ReflectionUtils.makeAccessible(field);
+
+    Class<?> generic = field.getType();
+
+    if (!Executor.class.isAssignableFrom(generic)) {
+      throw new IllegalArgumentException(
+          "Only Executor, ExecutorService, and ScheduledExecutorService are supported for @"
+              + OmegaContextAware.class.getSimpleName());
+    }
+
+    field.set(bean, ExecutorProxy.newInstance(field.get(bean), field.getType(), omegaContext));
+  }
+
+  private static class RunnableProxy implements InvocationHandler {
+
+    private final String globalTxId;
+    private final String localTxId;
+    private final String parentTxId;
+    private final Object runnable;
 
 Review comment:
   If it is Runnable, we can just treat it as Runnable.

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