source: trunk/src/main/java/omq/common/util/Serializer.java

package omq.common.util;

import java.io.IOException;
import java.util.Properties;

import omq.common.message.Request;
import omq.common.message.Response;
import omq.common.util.Serializers.GsonImp;
import omq.common.util.Serializers.ISerializer;
import omq.common.util.Serializers.JavaImp;
import omq.common.util.Serializers.KryoImp;
import omq.exception.SerializerException;
import omq.server.RemoteObject;

/**
 * 
 * Serializer enables to serialize the requests and the responses of the
 * remoteObjects. This class is used to have the same serializer object a not to
 * create new instances every time they are needed.
 * 
 * @author Sergi Toda <sergi.toda@estudiants.urv.cat>
 * 
 */
public class Serializer {
        public static final String KRYO = "kryo";
        public static final String JAVA = "java";
        public static final String GSON = "gson";

        // Client serializer
        public ISerializer serializer;

        // Server serializers
        private ISerializer kryoSerializer;
        private ISerializer javaSerializer;
        private ISerializer gsonSerializer;

        private Properties env;

        public Serializer(Properties env) {
                this.env = env;
        }

        private Boolean getEnableCompression() {
                return Boolean.valueOf(env.getProperty(ParameterQueue.ENABLE_COMPRESSION, "false"));
        }

        public ISerializer getInstance() throws SerializerException {
                if (serializer == null) {
                        try {
                                String className = env.getProperty(ParameterQueue.PROXY_SERIALIZER, Serializer.JAVA);

                                if (className == null || className.isEmpty()) {
                                        throw new ClassNotFoundException("Class name is null or empty.");
                                }

                                serializer = getInstance(className);
                        } catch (Exception ex) {
                                throw new SerializerException(ex.getMessage(), ex);
                        }
                }

                return serializer;
        }

        public ISerializer getInstance(String type) throws SerializerException {
                if (KRYO.equals(type)) {
                        if (kryoSerializer == null) {
                                kryoSerializer = new KryoImp();
                        }
                        return kryoSerializer;
                } else if (GSON.equals(type)) {
                        if (gsonSerializer == null) {
                                gsonSerializer = new GsonImp();
                        }
                        return gsonSerializer;
                } else if (JAVA.equals(type)) {
                        if (javaSerializer == null) {
                                javaSerializer = new JavaImp();
                        }
                        return javaSerializer;
                }

                throw new SerializerException("Serializer not found.");
        }

        public byte[] serialize(String type, Object obj) throws SerializerException {
                ISerializer instance = getInstance(type);

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        byte[] objSerialized = instance.serialize(obj);
                        try {
                                return Zipper.zip(objSerialized);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.serialize(obj);
                }
        }

        public byte[] serialize(Object obj) throws SerializerException {
                ISerializer instance = getInstance();

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        byte[] objSerialized = instance.serialize(obj);
                        try {
                                return Zipper.zip(objSerialized);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.serialize(obj);
                }
        }

        public Request deserializeRequest(String type, byte[] bytes, RemoteObject obj) throws SerializerException {
                ISerializer instance = getInstance(type);

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        try {
                                byte[] unZippedBytes = Zipper.unzip(bytes);
                                return instance.deserializeRequest(unZippedBytes, obj);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.deserializeRequest(bytes, obj);
                }
        }

        public Response deserializeResponse(byte[] bytes, Class<?> type) throws SerializerException {
                ISerializer instance = getInstance();

                Boolean enableCompression = getEnableCompression();
                if (enableCompression) {
                        try {
                                byte[] unZippedBytes = Zipper.unzip(bytes);
                                return instance.deserializeResponse(unZippedBytes, type);
                        } catch (IOException e) {
                                throw new SerializerException(e.getMessage(), e);
                        }
                } else {
                        return instance.deserializeResponse(bytes, type);
                }
        }

}