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GrpcRequestPropagationStreamObserver.java
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GrpcRequestPropagationStreamObserver.java
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/**
* 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.camel.component.grpc.server;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import io.grpc.stub.StreamObserver;
import org.apache.camel.component.grpc.GrpcConsumer;
import org.apache.camel.component.grpc.GrpcEndpoint;
/**
* gRPC request stream observer which is propagating every onNext(), onError()
* or onCompleted() calls to the Camel route
*/
public class GrpcRequestPropagationStreamObserver extends GrpcRequestAbstractStreamObserver {
public GrpcRequestPropagationStreamObserver(GrpcEndpoint endpoint, GrpcConsumer consumer, StreamObserver<Object> responseObserver, Map<String, Object> headers) {
super(endpoint, consumer, responseObserver, headers);
}
@Override
public void onNext(Object request) {
CountDownLatch latch = new CountDownLatch(1);
Object responseBody = null;
exchange = endpoint.createExchange();
exchange.getIn().setBody(request);
exchange.getIn().setHeaders(headers);
consumer.process(exchange, doneSync -> {
latch.countDown();
});
try {
latch.await();
if (exchange.hasOut()) {
responseBody = exchange.getOut().getBody();
} else {
responseBody = exchange.getIn().getBody();
}
if (responseBody instanceof List) {
List<?> responseList = (List<?>)responseBody;
responseList.forEach((responseItem) -> {
responseObserver.onNext(responseItem);
});
} else {
responseObserver.onNext(responseBody);
}
responseObserver.onCompleted();
} catch (InterruptedException e) {
responseObserver.onError(e);
}
}
@Override
public void onError(Throwable throwable) {
exchange = endpoint.createExchange();
exchange.getIn().setHeaders(headers);
consumer.onError(exchange, throwable);
responseObserver.onError(throwable);
}
@Override
public void onCompleted() {
exchange = endpoint.createExchange();
exchange.getIn().setHeaders(headers);
consumer.onCompleted(exchange);
responseObserver.onCompleted();
}
}