| /* |
| * 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.commons.util.profiledb.storage; |
| |
| import com.google.gson.Gson; |
| import org.apache.wayang.commons.util.profiledb.ProfileDB; |
| import org.apache.wayang.commons.util.profiledb.model.Experiment; |
| |
| import java.io.*; |
| import java.net.URI; |
| import java.util.Collection; |
| import java.util.LinkedList; |
| |
| /** |
| * Controls how conducted experiments will be persisted and loaded |
| */ |
| public abstract class Storage { |
| |
| /** |
| * Object or URI where experiments are persisted |
| */ |
| private URI storageFile; |
| |
| /** |
| * To access profileDB general serialization functions |
| */ |
| private ProfileDB context; |
| |
| /** |
| * Creates a new instance. |
| * @param uri Object or URI where experiments are persisted |
| */ |
| public Storage(URI uri){ |
| this.storageFile = uri; |
| } |
| |
| |
| |
| /** |
| * Sets the ProfileDB for this instance that manages all the Measurement subclasses |
| * */ |
| public void setContext(ProfileDB context) { |
| this.context = context; |
| } |
| |
| /** |
| * Allows to change where future experiments will be persisted and loaded |
| * @param uri |
| */ |
| public void changeLocation(URI uri){ |
| this.storageFile = uri; |
| } |
| |
| /** |
| * Receive an array of {@link Experiment}s and persist them |
| * |
| * @param experiments Array of {@link Experiment}s to be persisted |
| * @throws IOException |
| */ |
| public abstract void save(Experiment... experiments) throws IOException; |
| |
| /** |
| * Receive a Collection of {@link Experiment}s and persist them |
| * |
| * @param experiments Collection of {@link Experiment}s to be persisted |
| * @throws IOException |
| */ |
| public abstract void save(Collection<Experiment> experiments) throws IOException; |
| |
| /** |
| * Related to file based storage, Receive an array of {@link Experiment}s and persist them at the end of a file |
| * |
| * @param experiments Array of {@link Experiment}s to be persisted |
| * @throws IOException |
| */ |
| public abstract void append(Experiment... experiments) throws IOException; |
| |
| /** |
| * Related to file based storage, Receive a Collection of {@link Experiment}s and persist them at the end of a file |
| * |
| * @param experiments Collection of {@link Experiment}s to be persisted |
| * @throws IOException |
| */ |
| public abstract void append(Collection<Experiment> experiments) throws IOException ; |
| |
| /** |
| * Bring {@link Experiment}s from current Storage to local variable |
| * |
| * @return Collection of {@link Experiment}s |
| * @throws IOException |
| */ |
| public abstract Collection<Experiment> load() throws IOException; |
| |
| |
| //TODO The following methods should be moved to file storage implementation |
| /** |
| * Write {@link Experiment}s to an {@link OutputStream}. |
| * |
| * @param outputStream the {@link OutputStream} |
| */ |
| public void save(Collection<Experiment> experiments, OutputStream outputStream) throws IOException { |
| try { |
| BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); |
| this.save(experiments, writer); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("Unexpectedly, UTF-8 is not supported."); |
| } |
| } |
| |
| /** |
| * Write {@link Experiment}s to a {@link Writer}. |
| * |
| * @param writer the {@link Writer} |
| */ |
| public void save(Collection<Experiment> experiments, Writer writer) throws IOException { |
| try { |
| Gson gson = context.getGson(); |
| for (Experiment experiment : experiments) { |
| gson.toJson(experiment, writer); |
| writer.append('\n'); |
| } |
| writer.flush(); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("Unexpectedly, UTF-8 is not supported."); |
| } |
| } |
| |
| /** |
| * Load {@link Experiment}s from an {@link InputStream}. |
| * |
| * @param inputStream the {@link InputStream} |
| * @return the {@link Experiment}s |
| */ |
| public Collection<Experiment> load(InputStream inputStream) throws IOException { |
| try { |
| return load(new BufferedReader(new InputStreamReader(inputStream, "UTF-8"))); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("Unexpectedly, UTF-8 is not supported."); |
| } |
| } |
| |
| /** |
| * Load {@link Experiment}s from an {@link Reader}. |
| * |
| * @param reader the {@link Reader} |
| * @return the {@link Experiment}s |
| */ |
| public Collection<Experiment> load(BufferedReader reader) throws IOException { |
| Collection<Experiment> experiments = new LinkedList<>(); |
| Gson gson = context.getGson(); |
| String line; |
| while ((line = reader.readLine()) != null) { |
| Experiment experiment = gson.fromJson(line, Experiment.class); |
| experiments.add(experiment); |
| } |
| return experiments; |
| } |
| } |