[GitHub] seanyinx commented on a change in pull request #98: [WIP]SCB-138 use grpc bidirectional streaming to connect alpha and omega

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seanyinx commented on a change in pull request #98: [WIP]SCB-138 use grpc bidirectional streaming to connect alpha and omega
URL: https://github.com/apache/incubator-servicecomb-saga/pull/98#discussion_r159348811
 
 

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 File path: alpha/alpha-server/src/main/java/io/servicecomb/saga/alpha/server/GrpcOmegaCallback.java
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 @@ -0,0 +1,49 @@
+/*
+ *
+ * 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 io.servicecomb.saga.alpha.server;
+
+import com.google.protobuf.ByteString;
+
+import io.grpc.stub.StreamObserver;
+import io.servicecomb.saga.alpha.core.OmegaCallback;
+import io.servicecomb.saga.alpha.core.TxEvent;
+import io.servicecomb.saga.pack.contract.grpc.GrpcCompensateCommand;
+
+public class GrpcOmegaCallback implements OmegaCallback {
+
+  private final StreamObserver<GrpcCompensateCommand> observer;
+
+  public GrpcOmegaCallback(StreamObserver<GrpcCompensateCommand> observer) {
+    this.observer = observer;
+  }
+
+  @Override
+  public void compensate(TxEvent event) {
+    GrpcCompensateCommand command = GrpcCompensateCommand.newBuilder()
+        .setGlobalTxId(event.globalTxId())
+        .setLocalTxId(event.localTxId())
+        .setParentTxId(event.parentTxId().isEmpty() ? "" : event.parentTxId())
 
 Review comment:
   parentTxId will be null, if this sub tx has no parent.

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