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https://issues.apache.org/jira/browse/SCB-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310625#comment-16310625
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ASF GitHub Bot commented on SCB-138:
------------------------------------
seanyinx commented on a change in pull request #98: SCB-138 use grpc
bidirectional streaming to connect alpha and omega
URL:
https://github.com/apache/incubator-servicecomb-saga/pull/98#discussion_r159568988
##########
File path:
alpha/alpha-server/src/main/java/org/apache/servicecomb/saga/alpha/server/GrpcTxEventStreamObserver.java
##########
@@ -0,0 +1,127 @@
+/*
+ *
+ * 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.alpha.server;
+
+import static org.apache.servicecomb.saga.alpha.core.EventType.TxStartedEvent;
+
+import java.lang.invoke.MethodHandles;
+import java.util.Collection;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.servicecomb.saga.alpha.core.OmegaCallback;
+import org.apache.servicecomb.saga.alpha.core.TxConsistentService;
+import org.apache.servicecomb.saga.alpha.core.TxEvent;
+import org.apache.servicecomb.saga.pack.contract.grpc.GrpcCompensateCommand;
+import org.apache.servicecomb.saga.pack.contract.grpc.GrpcTxEvent;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import io.grpc.stub.StreamObserver;
+
+class GrpcTxEventStreamObserver implements StreamObserver<GrpcTxEvent> {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+ private final Map<String, Map<String, OmegaCallback>> omegaCallbacks;
+
+ private final Map<StreamObserver<GrpcCompensateCommand>, Map<String,
String>> omegaCallbacksReverse;
+
+ private final TxConsistentService txConsistentService;
+
+ private final StreamObserver<GrpcCompensateCommand> responseObserver;
+
+ GrpcTxEventStreamObserver(Map<String, Map<String, OmegaCallback>>
omegaCallbacks,
+ Map<StreamObserver<GrpcCompensateCommand>, Map<String, String>>
omegaCallbacksReverse,
+ TxConsistentService txConsistentService,
StreamObserver<GrpcCompensateCommand> responseObserver) {
+ this.omegaCallbacks = omegaCallbacks;
+ this.omegaCallbacksReverse = omegaCallbacksReverse;
+ this.txConsistentService = txConsistentService;
+ this.responseObserver = responseObserver;
+ }
+
+ @Override
+ public void onNext(GrpcTxEvent message) {
+ // register a callback on started event
+ String serviceName = message.getServiceName();
+ String instanceId = message.getInstanceId();
+ if (message.getType().equals(TxStartedEvent.name())) {
+ Map<String, OmegaCallback> instanceCallback = omegaCallbacks
+ .computeIfAbsent(serviceName, v -> new ConcurrentHashMap<>());
+ instanceCallback.putIfAbsent(instanceId, new
GrpcOmegaCallback(responseObserver));
Review comment:
this line creates a new grpc omega callback on every started event...
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> [pack] omega's callback about transaction state
> -----------------------------------------------
>
> Key: SCB-138
> URL: https://issues.apache.org/jira/browse/SCB-138
> Project: Apache ServiceComb
> Issue Type: New Feature
> Components: Saga
> Reporter: Eric Lee
> Assignee: Eric Lee
> Fix For: java-chassis-1.0.0-m1
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> as a dev, i want to register callback function in the server side, so the
> server can send messages back to the client directly instead of establishing
> a new connection to the exact client with its corresponding uri.
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