models-interactions/model-impl/cds/src/main/java/org/onap/policy/cds/client/CdsProcessorHandler.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * Copyright (C) 2019 Bell Canada.
   4  * ================================================================================
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  * ============LICENSE_END=========================================================
  17  */
  18
  19 package org.onap.policy.cds.client;
  20
  21 import io.grpc.ManagedChannel;
  22 import io.grpc.stub.StreamObserver;
  23 import java.util.concurrent.CountDownLatch;
  24 import org.onap.ccsdk.cds.controllerblueprints.common.api.ActionIdentifiers;
  25 import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc;
  26 import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceStub;
  27 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
  28 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
  29 import org.onap.policy.cds.api.CdsProcessorListener;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 public class CdsProcessorHandler {
  34
  35     private static final Logger LOGGER = LoggerFactory.getLogger(CdsProcessorHandler.class);
  36
  37     private CdsProcessorListener listener;
  38
  39     CdsProcessorHandler(final CdsProcessorListener listener) {
  40         this.listener = listener;
  41     }
  42
  43     CountDownLatch process(ExecutionServiceInput request, ManagedChannel channel) {
  44         final ActionIdentifiers header = request.getActionIdentifiers();
  45         LOGGER.info("Processing blueprint({}:{}) for action({})", header.getBlueprintVersion(),
  46             header.getBlueprintName(), header.getBlueprintVersion());
  47
  48         final CountDownLatch finishLatch = new CountDownLatch(1);
  49         final BluePrintProcessingServiceStub asyncStub = BluePrintProcessingServiceGrpc.newStub(channel);
  50         final StreamObserver<ExecutionServiceOutput> responseObserver = new StreamObserver<ExecutionServiceOutput>() {
  51             @Override
  52             public void onNext(ExecutionServiceOutput output) {
  53                 listener.onMessage(output);
  54             }
  55
  56             @Override
  57             public void onError(Throwable throwable) {
  58                 listener.onError(throwable);
  59                 finishLatch.countDown();
  60             }
  61
  62             @Override
  63             public void onCompleted() {
  64                 LOGGER.info("Completed blueprint({}:{}) for action({})", header.getBlueprintVersion(),
  65                     header.getBlueprintName(), header.getBlueprintVersion());
  66                 finishLatch.countDown();
  67             }
  68         };
  69
  70         final StreamObserver<ExecutionServiceInput> requestObserver = asyncStub.process(responseObserver);
  71         try {
  72             // Send the message to CDS backend for processing
  73             requestObserver.onNext(request);
  74             // Mark the end of requests
  75             requestObserver.onCompleted();
  76         } catch (RuntimeException e) {
  77             requestObserver.onError(e);
  78         }
  79         return finishLatch;
  80     }
  81 }