/* * Copyright (C) 2012, 2016 higherfrequencytrading.com * Copyright (C) 2016 Roman Leventov * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package net.openhft.chronicle.hash.serialization.impl; import net.openhft.chronicle.core.util.ObjectUtils; import net.openhft.chronicle.hash.Data; import net.openhft.chronicle.hash.serialization.DataAccess; import net.openhft.chronicle.hash.serialization.SizedReader; import net.openhft.chronicle.map.ChronicleMapBuilder; import net.openhft.chronicle.wire.Marshallable; import net.openhft.chronicle.wire.WireIn; import net.openhft.chronicle.wire.WireOut; import org.jetbrains.annotations.NotNull; /** * Holds new instance creation logic, common for many {@link DataAccess} and {@link SizedReader} * implementations * * @param <T> the type of objects deserialized */ public abstract class InstanceCreatingMarshaller<T> implements Marshallable { private Class<T> tClass; /** * Constructor for use in subclasses. * * @param tClass the class of objects deserialized */ protected InstanceCreatingMarshaller(Class<T> tClass) { this.tClass = tClass; } /** * Returns the class of objects deserialized. */ protected Class<T> tClass() { return tClass; } /** * Creates a new {@code T} instance by calling {@link Class#newInstance()}. If you need * different logic, i. e. calling a constructor with parameter, override this method in a * subclass of the specific {@link DataAccess} or {@link SizedReader} and configure in {@link * ChronicleMapBuilder}. * * @return a new instance to return from {@link Data#getUsing(Object)} or {@link * SizedReader#read(net.openhft.chronicle.bytes.Bytes, long, Object)} method */ protected T createInstance() { try { return ObjectUtils.newInstance(tClass); } catch (Exception e) { throw new IllegalStateException("Some of default marshallers, chosen for the type\n" + tClass + " by default, delegate to \n" + this.getClass().getName() + " which assumes the type has a public no-arg\n" + "constructor. If this is not true, you should either extend the marshaller,\n" + "overriding createInstance() and copy() (if defined), and the extending\n" + "class shouldn't be inner, because such classes couldn't be Serializable\n" + "that is a requirement for marshaller classes, or write and configure your\n" + "own marshaller for " + tClass + " type from scratch, and configure for the\n" + "Chronicle Map via keyMarshaller[s]() or valueMarshaller[s]() methods", e); } } @Override public void readMarshallable(@NotNull WireIn wireIn) { //noinspection unchecked tClass = wireIn.read(() -> "tClass").typeLiteral(); } @Override public void writeMarshallable(@NotNull WireOut wireOut) { wireOut.write(() -> "tClass").typeLiteral(tClass); } }