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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 - 2019 Bell Canada.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.so.client.cds;
import io.grpc.ManagedChannel;
import io.grpc.internal.DnsNameResolverProvider;
import io.grpc.internal.PickFirstLoadBalancerProvider;
import io.grpc.netty.NettyChannelBuilder;
import java.util.concurrent.CountDownLatch;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
import org.onap.so.client.PreconditionFailedException;
import org.onap.so.client.RestPropertiesLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <p>
* The CDS processing client is using gRPC for communication between SO and CDS.
* That communication is configured to use a streaming approach, meaning that
* client can send an event to which server can reply will multiple sub-responses,
* until full completion of the processing.
* </p>
* <p>
* In order for the caller to manage the callback, it is the responsibility of the
* caller to implement and provide a {@link CDSProcessingListener} so received messages
* can be handled appropriately.
* </p>
*
* Here is an example of implementation of such listener:
* <pre>
* new CDSProcessingListener {
*
* @Override
* public void onMessage(ExecutionServiceOutput message) {
* log.info("Received notification from CDS: {}", message);
* }
*
* @Override
* public void onError(Throwable t) {
* Status status = Status.fromThrowable(t);
* log.error("Failed processing blueprint {}", status, t);
* }
* }
* </pre>
*/
public class CDSProcessingClient implements AutoCloseable {
private static final Logger log = LoggerFactory.getLogger(CDSProcessingClient.class);
private ManagedChannel channel;
private CDSProcessingHandler handler;
public CDSProcessingClient(final CDSProcessingListener listener) {
CDSProperties props = RestPropertiesLoader.getInstance().getNewImpl(CDSProperties.class);
if (props == null) {
throw new PreconditionFailedException(
"No RestProperty.CDSProperties implementation found on classpath, can't create client.");
}
this.channel = NettyChannelBuilder
.forAddress(props.getHost(), props.getPort())
.nameResolverFactory(new DnsNameResolverProvider())
.loadBalancerFactory(new PickFirstLoadBalancerProvider())
.intercept(new BasicAuthClientInterceptor(props))
.usePlaintext()
.build();
this.handler = new CDSProcessingHandler(listener);
log.info("CDSProcessingClient started");
}
CDSProcessingClient(final ManagedChannel channel, final CDSProcessingHandler handler) {
this.channel = channel;
this.handler = handler;
}
/**
* Sends a request to the CDS backend micro-service.
*
* The caller will be returned a CountDownLatch that can be used
* to define how long the processing can wait. The CountDownLatch is
* initiated with just 1 count. When the client receives an #onCompleted callback,
* the counter will decrement.
*
* It is the user responsibility to close the client.
*
* @param input request to send
* @return CountDownLatch instance that can be use to #await for
* completeness of processing
*/
public CountDownLatch sendRequest(ExecutionServiceInput input) {
return handler.process(input, channel);
}
@Override
public void close() {
if (channel != null) {
channel.shutdown();
}
log.info("CDSProcessingClient stopped");
}
}
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