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/*
* ================================================================================
* Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.dcae.analytics.web.util.function;
import static org.onap.dcae.analytics.web.util.AnalyticsWebUtils.RANDOM_ID_SUPPLIER;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.LinkedList;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.onap.dcae.analytics.model.DmaapMrConstants;
import org.onap.dcae.analytics.web.dmaap.MrSubscriberPreferences;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.util.UriComponentsBuilder;
/**
* Creates DMaaP MR Subscriber URLs from {@link MrSubscriberPreferences}
*
* @author Rajiv Singla
*/
public class MrSubscriberURLFunction implements Function<MrSubscriberPreferences, List<URL>> {
private static final Logger logger = LoggerFactory.getLogger(MrSubscriberURLFunction.class);
private static final String URL_PATH_SEPARATOR = "/";
@Override
public List<URL> apply(final MrSubscriberPreferences subscriberConfig) {
final List<URL> subscriberURLs = new LinkedList<>();
// if consumer ids is not present generate single random consumer id
final List<String> consumerIds = subscriberConfig.getConsumerIds() != null ?
subscriberConfig.getConsumerIds() : Stream.of(RANDOM_ID_SUPPLIER.get()).collect(Collectors.toList());
for (final String consumerId : consumerIds) {
// request url must be present
final String requestURL = subscriberConfig.getRequestURL();
// generate random consumer group if not present
final String consumerGroup = subscriberConfig.getConsumerGroup() != null ?
subscriberConfig.getConsumerGroup() :
DmaapMrConstants.SUBSCRIBER_RANDOM_CONSUMER_GROUP_PREFIX + RANDOM_ID_SUPPLIER.get();
// set default message limit if not present
final Integer messageLimit = subscriberConfig.getMessageLimit() != null ?
subscriberConfig.getMessageLimit() : DmaapMrConstants.SUBSCRIBER_DEFAULT_MESSAGE_LIMIT;
// set default timeout if not present
final Integer timeout = subscriberConfig.getTimeout() != null ?
subscriberConfig.getTimeout() : DmaapMrConstants.SUBSCRIBER_DEFAULT_TIMEOUT;
final UriComponentsBuilder componentsBuilder = UriComponentsBuilder
.fromHttpUrl(requestURL)
.path(URL_PATH_SEPARATOR + consumerGroup + URL_PATH_SEPARATOR + consumerId);
if (messageLimit != null && messageLimit >= 1) {
componentsBuilder
.queryParam(DmaapMrConstants.SUBSCRIBER_MSG_LIMIT_QUERY_PARAM_NAME, messageLimit);
}
if (timeout != null && timeout >= 1) {
componentsBuilder
.queryParam(DmaapMrConstants.SUBSCRIBER_TIMEOUT_QUERY_PARAM_NAME, timeout);
}
subscriberURLs.add(createURL(componentsBuilder));
}
return subscriberURLs;
}
private URL createURL(final UriComponentsBuilder uriComponentsBuilder) {
try {
final URL subscriberURL = uriComponentsBuilder.build().toUri().toURL();
logger.info("Created DMaaP MR Subscriber URL: {}", subscriberURL);
return subscriberURL;
} catch (MalformedURLException e) {
throw new IllegalStateException("Unable to build DMaaP MR Subscriber URL", e);
}
}
}
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