| /* |
| * 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.wayang.core.platform; |
| |
| import org.apache.commons.lang3.SerializationException; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.optimizer.costs.ConstantLoadProfileEstimator; |
| import org.apache.wayang.core.optimizer.costs.EstimationContext; |
| import org.apache.wayang.core.optimizer.costs.LoadProfile; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimator; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimators; |
| import org.apache.wayang.core.util.JsonSerializables; |
| import org.apache.wayang.core.util.JsonSerializer; |
| import org.apache.wayang.core.util.json.JSONArray; |
| import org.apache.wayang.core.util.json.JSONObject; |
| |
| /** |
| * An atomic execution describes the smallest work unit considered by Wayang's cost model. |
| */ |
| public class AtomicExecution { |
| |
| /** |
| * Estimates the {@link LoadProfile} of the execution unit. |
| */ |
| private LoadProfileEstimator loadProfileEstimator; |
| |
| /** |
| * Creates a new instance with the given {@link LoadProfileEstimator}. |
| * |
| * @param loadProfileEstimator the {@link LoadProfileEstimator} |
| */ |
| public AtomicExecution(LoadProfileEstimator loadProfileEstimator) { |
| this.loadProfileEstimator = loadProfileEstimator; |
| } |
| |
| /** |
| * Estimates the {@link LoadProfile} for this instance under a given {@link EstimationContext}. |
| * |
| * @param context the {@link EstimationContext} |
| * @return the {@link LoadProfile} |
| */ |
| public LoadProfile estimateLoad(EstimationContext context) { |
| return this.loadProfileEstimator.estimate(context); |
| } |
| |
| /** |
| * This {@link JsonSerializer} stores the given instances via their {@link org.apache.wayang.core.api.Configuration} |
| * key, if any, or else by the {@link LoadProfile} that they estimate. |
| */ |
| public static class KeyOrLoadSerializer implements JsonSerializer<AtomicExecution> { |
| |
| private final Configuration configuration; |
| |
| private final EstimationContext estimationContext; |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param configuration required for deserialization; can otherwise be {@code null} |
| * @param estimationContext of the enclosing {@link AtomicExecutionGroup}; |
| * required for serialization; can otherwise be {@code null} |
| */ |
| public KeyOrLoadSerializer(Configuration configuration, EstimationContext estimationContext) { |
| this.configuration = configuration; |
| this.estimationContext = estimationContext; |
| } |
| |
| @Override |
| public JSONObject serialize(AtomicExecution atomicExecution) { |
| JSONArray estimators = new JSONArray(); |
| this.serialize(atomicExecution.loadProfileEstimator, estimators); |
| return new JSONObject().put("estimators", JsonSerializables.serialize(estimators, false)); |
| } |
| |
| private void serialize(LoadProfileEstimator estimator, JSONArray collector) { |
| JSONObject json = new JSONObject(); |
| if (estimator.getConfigurationKey() != null) { |
| json.put("key", estimator.getConfigurationKey()); |
| } else { |
| final LoadProfile loadProfile = estimator.estimate(this.estimationContext); |
| json.put("load", JsonSerializables.serialize(loadProfile, false)); |
| } |
| collector.put(json); |
| for (LoadProfileEstimator nestedEstimator : estimator.getNestedEstimators()) { |
| this.serialize(nestedEstimator, collector); |
| } |
| } |
| |
| @Override |
| public AtomicExecution deserialize(JSONObject json) { |
| return this.deserialize(json, AtomicExecution.class); |
| } |
| |
| @Override |
| public AtomicExecution deserialize(JSONObject json, Class<? extends AtomicExecution> cls) { |
| final JSONArray estimators = json.getJSONArray("estimators"); |
| if (estimators.length() < 1) { |
| throw new IllegalStateException("Expected at least one serialized estimator."); |
| } |
| // De-serialize the main estimator. |
| final JSONObject mainEstimatorJson = estimators.getJSONObject(0); |
| LoadProfileEstimator mainEstimator = this.deserializeEstimator(mainEstimatorJson); |
| |
| // De-serialize nested estimators. |
| for (int i = 1; i < estimators.length(); i++) { |
| mainEstimator.nest(this.deserializeEstimator(estimators.getJSONObject(i))); |
| } |
| |
| return new AtomicExecution(mainEstimator); |
| } |
| |
| /** |
| * Deserialize a {@link LoadProfileEstimator} according to {@link #serialize(LoadProfileEstimator, JSONArray)}. |
| * |
| * @param jsonObject that should be deserialized |
| * @return the {@link LoadProfileEstimator} |
| */ |
| private LoadProfileEstimator deserializeEstimator(JSONObject jsonObject) { |
| if (jsonObject.has("key")) { |
| final String key = jsonObject.getString("key"); |
| final LoadProfileEstimator estimator = LoadProfileEstimators.createFromSpecification(key, this.configuration); |
| if (estimator == null) { |
| throw new SerializationException("Could not create estimator for key " + key); |
| } |
| return estimator; |
| } else if (jsonObject.has("load")) { |
| final LoadProfile load = JsonSerializables.deserialize(jsonObject.getJSONObject("load"), LoadProfile.class); |
| return new ConstantLoadProfileEstimator(load); |
| } |
| throw new SerializationException(String.format("Cannot deserialize load estimator from %s.", jsonObject)); |
| } |
| } |
| |
| /** |
| * Retrieve the {@link LoadProfileEstimator} encapsulated by this instance. |
| * |
| * @return the {@link LoadProfileEstimator} |
| */ |
| public LoadProfileEstimator getLoadProfileEstimator() { |
| return this.loadProfileEstimator; |
| } |
| |
| /** |
| * Change the {@link LoadProfileEstimator} encapsulated by this instance. |
| * |
| * @param loadProfileEstimator the {@link LoadProfileEstimator} |
| */ |
| public void setLoadProfileEstimator(LoadProfileEstimator loadProfileEstimator) { |
| this.loadProfileEstimator = loadProfileEstimator; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(this.getClass().getSimpleName()).append('['); |
| if (this.loadProfileEstimator.getConfigurationKey() != null) { |
| sb.append(this.loadProfileEstimator.getConfigurationKey()); |
| } else { |
| sb.append(this.loadProfileEstimator); |
| } |
| if (!this.loadProfileEstimator.getNestedEstimators().isEmpty()) { |
| sb.append('+').append(this.loadProfileEstimator.getNestedEstimators().size()).append(" nested"); |
| } |
| sb.append(']'); |
| return sb.toString(); |
| } |
| } |