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https://issues.apache.org/jira/browse/SCB-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308978#comment-16308978
]
ASF GitHub Bot commented on SCB-138:
------------------------------------
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_r159349423
##########
File path:
alpha/alpha-server/src/main/java/io/servicecomb/saga/alpha/server/GrpcTxEventStreamObserver.java
##########
@@ -0,0 +1,90 @@
+/*
+ *
+ * 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 static io.servicecomb.saga.alpha.core.EventType.TxStartedEvent;
+
+import java.lang.invoke.MethodHandles;
+import java.util.Date;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import io.grpc.stub.StreamObserver;
+import io.servicecomb.saga.alpha.core.OmegaCallback;
+import io.servicecomb.saga.alpha.core.TxConsistentService;
+import io.servicecomb.saga.alpha.core.TxEvent;
+import io.servicecomb.saga.pack.contract.grpc.GrpcCompensateCommand;
+import io.servicecomb.saga.pack.contract.grpc.GrpcTxEvent;
+
+class GrpcTxEventStreamObserver implements StreamObserver<GrpcTxEvent> {
+
+ private static Logger LOG =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+ private final Map<String, Map<String, OmegaCallback>> omegaCallbacks;
+
+ private final TxConsistentService txConsistentService;
+
+ private final StreamObserver<GrpcCompensateCommand> responseObserver;
+
+ GrpcTxEventStreamObserver(Map<String, Map<String, OmegaCallback>>
omegaCallbacks,
+ TxConsistentService txConsistentService,
StreamObserver<GrpcCompensateCommand> responseObserver) {
+ this.omegaCallbacks = omegaCallbacks;
+ this.txConsistentService = txConsistentService;
+ this.responseObserver = responseObserver;
+ }
+
+ @Override
+ public void onNext(GrpcTxEvent message) {
+ // register a callback on started event
+ if (message.getType().equals(TxStartedEvent.name())) {
+ Map<String, OmegaCallback> callbacks = new ConcurrentHashMap<>();
+ callbacks.put(message.getInstanceId(), new
GrpcOmegaCallback(responseObserver));
+ omegaCallbacks.put(message.getServiceName(), callbacks);
+ }
+
+ // store received event
+ txConsistentService.handle(new TxEvent(
+ message.getServiceName(),
+ message.getInstanceId(),
+ new Date(message.getTimestamp()),
+ message.getGlobalTxId(),
+ message.getLocalTxId(),
+ message.getParentTxId().isEmpty() ? null : message.getParentTxId(),
+ message.getType(),
+ message.getCompensationMethod(),
+ message.getPayloads().toByteArray()
+ ));
+ }
+
+ @Override
+ public void onError(Throwable t) {
+ LOG.error("failed to process grpc message.", t);
Review comment:
does onError & onCompleted mean the client is disconnected? if so, we need
to find a way to remove the instance from the callback map
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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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