| /* |
| * |
| * 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.metron.profiler.spark.function; |
| |
| import org.apache.metron.common.configuration.profiler.ProfilerConfig; |
| import org.apache.metron.common.utils.LazyLogger; |
| import org.apache.metron.common.utils.LazyLoggerFactory; |
| import org.apache.metron.profiler.DefaultMessageRouter; |
| import org.apache.metron.profiler.MessageRoute; |
| import org.apache.metron.profiler.MessageRouter; |
| import org.apache.metron.profiler.clock.Clock; |
| import org.apache.metron.profiler.clock.ClockFactory; |
| import org.apache.metron.profiler.clock.EventTimeOnlyClockFactory; |
| import org.apache.metron.stellar.dsl.Context; |
| import org.apache.spark.api.java.function.FlatMapFunction; |
| import org.json.simple.JSONObject; |
| import org.json.simple.parser.JSONParser; |
| |
| import java.lang.invoke.MethodHandles; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| |
| /** |
| * The function responsible for finding routes for a given message in Spark. |
| */ |
| public class MessageRouterFunction implements FlatMapFunction<String, MessageRoute> { |
| |
| protected static final LazyLogger LOG = LazyLoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| /** |
| * The global configuration used for the execution of Stellar. |
| */ |
| private Map<String, String> globals; |
| |
| /** |
| * The profile definitions. |
| */ |
| private ProfilerConfig profilerConfig; |
| |
| /** |
| * A clock that can extract time from the messages received. |
| */ |
| private Clock clock; |
| |
| /** |
| * Only messages with a timestamp after this will be routed. |
| */ |
| private Long begin; |
| |
| /** |
| * Only messages with a timestamp before this will be routed. |
| */ |
| private Long end; |
| |
| public MessageRouterFunction(ProfilerConfig profilerConfig, Map<String, String> globals) { |
| this.profilerConfig = profilerConfig; |
| this.globals = globals; |
| this.begin = Long.MIN_VALUE; |
| this.end = Long.MAX_VALUE; |
| withClockFactory(new EventTimeOnlyClockFactory()); |
| } |
| |
| /** |
| * Find all routes for a given telemetry message. |
| * |
| * <p>A message may need routed to multiple profiles should it be needed by more than one. A |
| * message may also not be routed should it not be needed by any profiles. |
| * |
| * @param jsonMessage The raw JSON message. |
| * @return A list of message routes. |
| */ |
| @Override |
| public Iterator<MessageRoute> call(String jsonMessage) throws Exception { |
| List<MessageRoute> routes = Collections.emptyList(); |
| JSONParser parser = new JSONParser(); |
| Context context = TaskUtils.getContext(globals); |
| MessageRouter router = new DefaultMessageRouter(context); |
| |
| // parse the raw message |
| Optional<JSONObject> message = toMessage(jsonMessage, parser); |
| if(message.isPresent()) { |
| |
| // extract the timestamp from the message |
| Optional<Long> timestampOpt = clock.currentTimeMillis(message.get()); |
| if (timestampOpt.isPresent()) { |
| |
| // timestamp must be in [begin, end] |
| Long timestamp = timestampOpt.get(); |
| if(timestamp >= begin && timestamp <= end) { |
| routes = router.route(message.get(), profilerConfig, context); |
| LOG.trace("Found {} route(s) for a message", routes.size()); |
| |
| } else { |
| LOG.trace("Ignoring message; timestamp={} not in [{},{}]", () -> timestamp, () -> prettyPrint(begin), () -> prettyPrint(end)); |
| } |
| |
| } else { |
| LOG.trace("No timestamp in message. Message will be ignored."); |
| } |
| |
| } else { |
| LOG.trace("Unable to parse message. Message will be ignored"); |
| } |
| |
| return routes.iterator(); |
| } |
| |
| /** |
| * Set a time constraint. |
| * |
| * @param begin Only messages with a timestamp after this will be routed. |
| * @return The message router function |
| */ |
| public MessageRouterFunction withBegin(Long begin) { |
| this.begin = begin; |
| return this; |
| } |
| |
| /** |
| * Set a time constraint. |
| * |
| * @param end Only messages with a timestamp before this will be routed. |
| * @return The message router function |
| */ |
| public MessageRouterFunction withEnd(Long end) { |
| this.end = end; |
| return this; |
| } |
| |
| /** |
| * Defines the {@link ClockFactory} used to create the {@link Clock}. |
| * |
| * <p>Calling this method is only needed to override the default behavior. |
| * |
| * @param clockFactory The factory to use for creating the {@link Clock}. |
| * @return The message router function. |
| */ |
| public MessageRouterFunction withClockFactory(ClockFactory clockFactory) { |
| this.clock = clockFactory.createClock(profilerConfig); |
| return this; |
| } |
| |
| /** |
| * Parses the raw JSON of a message. |
| * |
| * @param json The raw JSON to parse. |
| * @param parser The parser to use. |
| * @return The parsed telemetry message. |
| */ |
| private static Optional<JSONObject> toMessage(String json, JSONParser parser) { |
| try { |
| JSONObject message = (JSONObject) parser.parse(json); |
| return Optional.of(message); |
| |
| } catch(Throwable e) { |
| LOG.warn(String.format("Unable to parse message, message will be ignored; message='%s'", json), e); |
| return Optional.empty(); |
| } |
| } |
| |
| /** |
| * Pretty prints a Long value for use when logging these values. |
| * |
| * <p>Long.MIN_VALUE and Long.MAX_VALUE will occur frequently and is difficult to grok in the logs. Instead |
| * Long.MIN_VALUE is rendered as "MIN". Long.MAX_VALUE is srendered as "MAX". All other values are rendered |
| * directly. |
| * |
| * @param value The value to pretty print. |
| * @return |
| */ |
| private static String prettyPrint(Long value) { |
| String result; |
| if(value == Long.MIN_VALUE) { |
| result = "MIN"; |
| } else if(value == Long.MAX_VALUE) { |
| result = "MAX"; |
| } else { |
| result = value.toString(); |
| } |
| return result; |
| } |
| } |