Initial OpenECOMP policy/drools-pdp commit

Change-Id: I0072ccab6f40ed32da39667f9f8523b6d6dad2e2
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>

1 files changed, 362 insertions, 0 deletions

diff --git a/policy-endpoints/src/main/java/org/openecomp/policy/drools/event/comm/bus/UebTopicSourceFactory.java b/policy-endpoints/src/main/java/org/openecomp/policy/drools/event/comm/bus/UebTopicSourceFactory.java
new file mode 100644
index 00000000..bf2a4038
--- /dev/null
+++ b/policy-endpoints/src/main/java/org/openecomp/policy/drools/event/comm/bus/UebTopicSourceFactory.java
@@ -0,0 +1,362 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * policy-endpoints
+ * ================================================================================
+ * Copyright (C) 2017 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.openecomp.policy.drools.event.comm.bus;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Properties;
+
+import org.openecomp.policy.drools.event.comm.bus.internal.SingleThreadedUebTopicSource;
+import org.openecomp.policy.common.logging.flexlogger.FlexLogger;
+import org.openecomp.policy.common.logging.flexlogger.Logger;
+import org.openecomp.policy.drools.properties.PolicyProperties;
+
+/**
+ * UEB Topic Source Factory
+ */
+public interface UebTopicSourceFactory {
+	
+	/**
+	 * Creates an UEB Topic Source based on properties files
+	 * 
+	 * @param properties Properties containing initialization values
+	 * 
+	 * @return an UEB Topic Source
+	 * @throws IllegalArgumentException if invalid parameters are present
+	 */
+	public List<UebTopicSource> build(Properties properties)
+			throws IllegalArgumentException;
+	
+	/**
+	 * Instantiates a new UEB Topic Source
+	 * 
+	 * @param servers list of servers
+	 * @param topic topic name
+	 * @param apiKey API Key
+	 * @param apiSecret API Secret
+	 * @param consumerGroup Consumer Group
+	 * @param consumerInstance Consumer Instance
+	 * @param fetchTimeout Read Fetch Timeout
+	 * @param fetchLimit Fetch Limit
+	 * @param managed is this source endpoint managed?
+	 * 
+	 * @return an UEB Topic Source
+	 * @throws IllegalArgumentException if invalid parameters are present
+	 */
+	public UebTopicSource build(List<String> servers, 
+								String topic, 
+								String apiKey, 
+								String apiSecret, 
+								String consumerGroup, 
+								String consumerInstance,
+								int fetchTimeout,
+								int fetchLimit,
+								boolean managed)
+			throws IllegalArgumentException;
+	
+	/**
+	 * Instantiates a new UEB Topic Source
+	 * 
+	 * @param servers list of servers
+	 * @param topic topic name
+	 * @param apiKey API Key
+	 * @param apiSecret API Secret
+	 * 
+	 * @return an UEB Topic Source
+	 * @throws IllegalArgumentException if invalid parameters are present
+	 */
+	public UebTopicSource build(List<String> servers, 
+								String topic, 
+								String apiKey, 
+								String apiSecret)
+			throws IllegalArgumentException;
+
+	/**
+	 * Instantiates a new UEB Topic Source
+	 * 
+	 * @param uebTopicSourceType Implementation type
+	 * @param servers list of servers
+	 * @param topic topic name
+	 * 
+	 * @return an UEB Topic Source
+	 * @throws IllegalArgumentException if invalid parameters are present
+	 */
+	public UebTopicSource build(List<String> servers, 
+								String topic)
+			throws IllegalArgumentException;	
+	
+	/**
+	 * Destroys an UEB Topic Source based on a topic
+	 * 
+	 * @param topic topic name
+	 * @throws IllegalArgumentException if invalid parameters are present
+	 */
+	public void destroy(String topic);
+	
+	/**
+	 * Destroys all UEB Topic Sources
+	 */
+	public void destroy();
+	
+	/**
+	 * gets an UEB Topic Source based on topic name
+	 * @param topic the topic name
+	 * @return an UEB Topic Source with topic name
+	 * @throws IllegalArgumentException if an invalid topic is provided
+	 * @throws IllegalStateException if the UEB Topic Source is 
+	 * an incorrect state
+	 */
+	public UebTopicSource get(String topic)
+		   throws IllegalArgumentException, IllegalStateException;
+	
+	/**
+	 * Provides a snapshot of the UEB Topic Sources
+	 * @return a list of the UEB Topic Sources
+	 */
+	public List<UebTopicSource> inventory();
+}
+
+/* ------------- implementation ----------------- */
+
+/**
+ * Factory of UEB Source Topics indexed by topic name
+ */
+class IndexedUebTopicSourceFactory implements UebTopicSourceFactory {
+	// get an instance of logger 
+	private static Logger  logger = FlexLogger.getLogger(IndexedUebTopicSourceFactory.class);	
+	/**
+	 * UEB Topic Name Index
+	 */
+	protected HashMap<String, UebTopicSource> uebTopicSources =
+			new HashMap<String, UebTopicSource>();
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public UebTopicSource build(List<String> servers, 
+								String topic, 
+								String apiKey, 
+								String apiSecret, 
+								String consumerGroup, 
+								String consumerInstance,
+								int fetchTimeout,
+								int fetchLimit,
+								boolean managed) 
+	throws IllegalArgumentException {
+		
+		if (topic == null || topic.isEmpty()) {
+			throw new IllegalArgumentException("A topic must be provided");
+		}
+		
+		synchronized(this) {
+			if (uebTopicSources.containsKey(topic)) {
+				return uebTopicSources.get(topic);
+			}
+			
+			UebTopicSource uebTopicSource = 
+					new SingleThreadedUebTopicSource(servers, topic, 
+													 apiKey, apiSecret,
+													 consumerGroup, consumerInstance, 
+													 fetchTimeout, fetchLimit);
+			
+			if (managed)
+				uebTopicSources.put(topic, uebTopicSource);
+			
+			return uebTopicSource;
+		}
+	}
+	
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public List<UebTopicSource> build(Properties properties) 
+			throws IllegalArgumentException {
+		
+		String readTopics = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS);
+		if (readTopics == null || readTopics.isEmpty()) {
+			logger.warn("No topic for UEB Source " + properties);
+			return new ArrayList<UebTopicSource>();
+		}
+		List<String> readTopicList = new ArrayList<String>(Arrays.asList(readTopics.split("\\s*,\\s*")));		
+		
+		List<UebTopicSource> uebTopicSources = new ArrayList<UebTopicSource>();
+		synchronized(this) {
+			for (String topic: readTopicList) {
+				
+				String servers = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + "." + 
+                                                        topic + 
+                                                        PolicyProperties.PROPERTY_TOPIC_SERVERS_SUFFIX);
+				
+				if (servers == null || servers.isEmpty()) {
+					logger.error("No UEB servers provided in " + properties);
+					continue;
+				}
+				
+				List<String> serverList = new ArrayList<String>(Arrays.asList(servers.split("\\s*,\\s*")));
+				
+				String apiKey = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + 
+                        							   "." + topic + 
+                                                       PolicyProperties.PROPERTY_TOPIC_API_KEY_SUFFIX);
+				
+				String apiSecret = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + 
+						                                  "." + topic + 
+                                                          PolicyProperties.PROPERTY_TOPIC_API_SECRET_SUFFIX);
+				
+				String consumerGroup = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + 
+						                                      "." + topic + 
+                                                              PolicyProperties.PROPERTY_TOPIC_SOURCE_CONSUMER_GROUP_SUFFIX);
+				
+				String consumerInstance = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + 
+						                                         "." + topic + 
+                                                                 PolicyProperties.PROPERTY_TOPIC_SOURCE_CONSUMER_INSTANCE_SUFFIX);
+				
+				String fetchTimeoutString = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + 
+						                                           "." + topic + 
+                                                                   PolicyProperties.PROPERTY_TOPIC_SOURCE_FETCH_TIMEOUT_SUFFIX);
+				int fetchTimeout = UebTopicSource.DEFAULT_TIMEOUT_MS_FETCH;
+				if (fetchTimeoutString != null && !fetchTimeoutString.isEmpty()) {
+					try {
+						fetchTimeout = Integer.parseInt(fetchTimeoutString);
+					} catch (NumberFormatException nfe) {
+						logger.warn("Fetch Timeout in invalid format for topic " + topic + ": " + fetchTimeoutString);
+					}
+				}
+					
+				String fetchLimitString = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + 
+                                                                 "." + topic + 
+                                                                 PolicyProperties.PROPERTY_TOPIC_SOURCE_FETCH_TIMEOUT_SUFFIX);
+				int fetchLimit = UebTopicSource.DEFAULT_LIMIT_FETCH;
+				if (fetchLimitString != null && !fetchLimitString.isEmpty()) {
+					try {
+						fetchLimit = Integer.parseInt(fetchLimitString);
+					} catch (NumberFormatException nfe) {
+						logger.warn("Fetch Limit in invalid format for topic " + topic + ": " + fetchLimitString);
+					}
+				}
+				
+				String managedString = properties.getProperty(PolicyProperties.PROPERTY_UEB_SOURCE_TOPICS + "." +
+						                                      topic + PolicyProperties.PROPERTY_MANAGED_SUFFIX);
+				boolean managed = true;
+				if (managedString != null && !managedString.isEmpty()) {
+					managed = Boolean.parseBoolean(managedString);
+				}
+			
+				UebTopicSource uebTopicSource = this.build(serverList, topic, 
+						   						           apiKey, apiSecret,
+						   						           consumerGroup, consumerInstance, 
+						   						           fetchTimeout, fetchLimit, managed);
+				uebTopicSources.add(uebTopicSource);
+			}
+		}
+		return uebTopicSources;
+	}
+	
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public UebTopicSource build(List<String> servers, 
+								String topic,
+								String apiKey, 
+								String apiSecret) {
+		return this.build(servers, topic, 
+				  		  apiKey, apiSecret,
+				  		  null, null,
+				  		  UebTopicSource.DEFAULT_TIMEOUT_MS_FETCH,
+				  		  UebTopicSource.DEFAULT_LIMIT_FETCH, true);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public UebTopicSource build(List<String> servers, String topic) {
+		return this.build(servers, topic, null, null);
+	}	
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public void destroy(String topic) 
+		   throws IllegalArgumentException {
+		
+		if (topic == null || topic.isEmpty()) {
+			throw new IllegalArgumentException("A topic must be provided");
+		}
+		
+		UebTopicSource uebTopicSource;
+		
+		synchronized(this) {
+			if (!uebTopicSources.containsKey(topic)) {
+				return;
+			}
+			
+			uebTopicSource = uebTopicSources.remove(topic);
+		}
+		
+		uebTopicSource.shutdown();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public UebTopicSource get(String topic) 
+	       throws IllegalArgumentException, IllegalStateException {
+		
+		if (topic == null || topic.isEmpty()) {
+			throw new IllegalArgumentException("A topic must be provided");
+		}
+		
+		synchronized(this) {
+			if (uebTopicSources.containsKey(topic)) {
+				return uebTopicSources.get(topic);
+			} else {
+				throw new IllegalStateException("UebTopiceSource for " + topic + " not found");
+			}
+		}
+	}
+
+	@Override
+	public synchronized List<UebTopicSource> inventory() {
+		 List<UebTopicSource> readers = 
+				 new ArrayList<UebTopicSource>(this.uebTopicSources.values());
+		 return readers;
+	}
+
+	@Override
+	public void destroy() {
+		List<UebTopicSource> readers = this.inventory();
+		for (UebTopicSource reader: readers) {
+			reader.shutdown();
+		}
+		
+		synchronized(this) {
+			this.uebTopicSources.clear();
+		}
+	}
+	
+}