WillemJiang commented on a change in pull request #138: [WIP] SCB-224 retry 
sub-transaction on failure
URL: 
https://github.com/apache/incubator-servicecomb-saga/pull/138#discussion_r173799851
 
 

 ##########
 File path: 
omega/omega-transaction/src/main/java/org/apache/servicecomb/saga/omega/transaction/ForwardRecovery.java
 ##########
 @@ -0,0 +1,70 @@
+/*
+ * 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;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+
+import javax.transaction.InvalidTransactionException;
+
+import org.apache.servicecomb.saga.omega.context.OmegaContext;
+import org.apache.servicecomb.saga.omega.transaction.annotations.Compensable;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.reflect.MethodSignature;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ForwardRecovery extends DefaultRecovery {
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  // TODO: 2018/03/10 we do not support retry with timeout yet
+  @Override
+  public Object apply(ProceedingJoinPoint joinPoint, Compensable compensable, 
CompensableInterceptor interceptor,
+      OmegaContext context, String parentTxId, int retries) throws Throwable {
+    Method method = ((MethodSignature) joinPoint.getSignature()).getMethod();
+    int remains = retries;
+    try {
+      while (true) {
+        try {
+          return super.apply(joinPoint, compensable, interceptor, context, 
parentTxId, remains);
+        } catch (Throwable throwable) {
+          if (throwable instanceof InvalidTransactionException) {
+            throw throwable;
+          }
+
+          remains = remains == -1 ? -1 : remains - 1;
+          if (remains == 0) {
+            log.error(
+                "Retried sub tx failed maximum times, global tx id: {}, local 
tx id: {}, method: {}, retried times: {}",
+                context.globalTxId(), context.localTxId(), method.toString(), 
retries);
+            throw throwable;
+          }
+
+          log.warn("Retrying sub tx failed, global tx id: {}, local tx id: {}, 
method: {}, remains: {}",
+              context.globalTxId(), context.localTxId(), method.toString(), 
remains);
+          Thread.sleep(compensable.retryDelayInMilliseconds());
 
 Review comment:
   It may cause some performance issue by using Thread.sleep here.
   we may need to consider to use scheduler for it.

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