Java tutorial
/* * Copyright 2002-2013 SCOOP Software GmbH * * 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. */ package de.scoopgmbh.copper.persistent; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable; import java.util.zip.DataFormatException; import java.util.zip.Deflater; import org.apache.commons.codec.binary.Base64; import de.scoopgmbh.copper.Response; import de.scoopgmbh.copper.Workflow; import de.scoopgmbh.copper.common.WorkflowRepository; /** * Implementation of the {@link Serializer} interface using java's standard object serialization. * If compression is enabled, the serialized objects are compressed if the size of the corresponding * byte array is larger than a configured threshold. * * @author austermann * */ public class StandardJavaSerializer implements Serializer { private boolean compress = true; private int compressThresholdSize = 250; private int compressorMaxSize = 128 * 1024; private ThreadLocal<Compressor> compressorTL = new ThreadLocal<Compressor>() { @Override protected Compressor initialValue() { return new Compressor(Deflater.BEST_COMPRESSION, compressorMaxSize); } }; public void setCompress(boolean compress) { this.compress = compress; } public void setCompressorMaxSize(int compressorMaxSize) { this.compressorMaxSize = compressorMaxSize; compressorTL = new ThreadLocal<Compressor>() { @Override protected Compressor initialValue() { return new Compressor(Deflater.BEST_COMPRESSION, StandardJavaSerializer.this.compressorMaxSize); } }; } public void setCompressThresholdSize(int compressThresholdSize) { this.compressThresholdSize = compressThresholdSize; } private String serialize(final Object o) throws IOException { if (o == null) return null; final ByteArrayOutputStream baos = new ByteArrayOutputStream(1024); final ObjectOutputStream oos = new ObjectOutputStream(baos); oos.writeObject(o); oos.close(); baos.close(); byte[] data = baos.toByteArray(); boolean isCompressed = false; if (compress && compressThresholdSize <= data.length && data.length <= compressorMaxSize) { data = compressorTL.get().compress(data); isCompressed = true; } final String encoded = new Base64().encodeToString(data); final StringBuilder sb = new StringBuilder(encoded.length() + 4); sb.append(isCompressed ? 'C' : 'U').append(encoded); return sb.toString(); } private Serializable deserialize(String _data, final WorkflowRepository wfRepo) throws IOException, ClassNotFoundException, DataFormatException { if (_data == null) return null; boolean isCompressed = _data.charAt(0) == 'C'; byte[] data = Base64.decodeBase64(_data.substring(1)); if (isCompressed) { data = compressorTL.get().uncompress(data); } ByteArrayInputStream bais = new ByteArrayInputStream(data); ObjectInputStream ois = wfRepo != null ? new ObjectInputStream(bais) { @Override protected java.lang.Class<?> resolveClass(java.io.ObjectStreamClass desc) throws java.io.IOException, ClassNotFoundException { return wfRepo.resolveClass(desc); }; } : new ObjectInputStream(bais); Serializable o = (Serializable) ois.readObject(); ois.close(); return o; } @Override public SerializedWorkflow serializeWorkflow(Workflow<?> o) throws Exception { SerializedWorkflow sw = new SerializedWorkflow(); sw.setData(serializeData(o)); sw.setObjectState(serialize(o)); return sw; } protected String serializeData(Workflow<?> o) throws IOException { return serialize(o.getData()); } @Override public Workflow<?> deserializeWorkflow(SerializedWorkflow sw, WorkflowRepository wfRepo) throws Exception { PersistentWorkflow<?> wf = (PersistentWorkflow<?>) deserialize(sw.getObjectState(), wfRepo); wf.setDataAsObject(deserializeData(sw)); return wf; } protected Object deserializeData(SerializedWorkflow sw) throws Exception { return deserializeObject(sw.getData()); } @Override public String serializeResponse(Response<?> r) throws Exception { return serialize(r); } @Override public Response<?> deserializeResponse(String _data) throws Exception { return (Response<?>) deserialize(_data, null); } public String serializeObject(Serializable o) throws Exception { return serialize(o); } public Serializable deserializeObject(String _data) throws Exception { return deserialize(_data, null); } }