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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.dmaap;
+
+
+import java.net.URL;
+import java.util.List;
+import java.util.function.Supplier;
+
+import org.onap.dcae.analytics.model.AnalyticsHttpConstants;
+import org.onap.dcae.analytics.model.util.supplier.UnboundedSupplier;
+import org.onap.dcae.analytics.web.util.AnalyticsWebUtils;
+import org.onap.dcae.analytics.web.util.function.MrSubscriberURLFunction;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.integration.support.MessageBuilder;
+import org.springframework.messaging.Message;
+
+/**
+ * Provides DMaaP MR Subscriber Trigger Message
+ *
+ * @author Rajiv Singla
+ */
+public class MrTriggerMessageProvider {
+
+ private static final Logger logger = LoggerFactory.getLogger(MrTriggerMessageProvider.class);
+
+ public static final String TRIGGER_METHOD_NAME = "getTriggerMessage";
+
+ private final Supplier<URL> subscriberUrlSupplier;
+
+ public MrTriggerMessageProvider(final MrSubscriberPreferences subscriberPreferences) {
+ final List<URL> urls = new MrSubscriberURLFunction().apply(subscriberPreferences);
+ subscriberUrlSupplier = new UnboundedSupplier<>(urls.toArray(new URL[urls.size()]));
+ }
+
+ /**
+ * DMaaP MR subscriber trigger message
+ *
+ * @return dmaap mr subscriber trigger message
+ */
+ public Message<String> getTriggerMessage() {
+ final String requestId = AnalyticsWebUtils.REQUEST_ID_SUPPLIER.get();
+ final String transactionId = AnalyticsWebUtils.RANDOM_ID_SUPPLIER.get();
+ final String beginTimestamp = AnalyticsWebUtils.CREATION_TIMESTAMP_SUPPLIER.get();
+ logger.debug("Request Id: {}. Transaction Id: {}. Begin TS: {}. Starting new DMaaP MR Subscriber poll.",
+ requestId, transactionId, beginTimestamp);
+ return MessageBuilder
+ .withPayload(subscriberUrlSupplier.get().toString())
+ .setHeader(AnalyticsHttpConstants.REQUEST_ID_HEADER_KEY, requestId)
+ .setHeader(AnalyticsHttpConstants.REQUEST_TRANSACTION_ID_HEADER_KEY, transactionId)
+ .setHeader(AnalyticsHttpConstants.REQUEST_BEGIN_TS_HEADER_KEY, beginTimestamp)
+ .build();
+ }
+}