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The implementation module of Ehcache 3
/*
* Copyright Terracotta, Inc.
*
* 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 org.ehcache.impl.internal.spi.serialization;
import org.ehcache.core.spi.service.ServiceUtils;
import org.ehcache.impl.config.serializer.DefaultSerializationProviderConfiguration;
import org.ehcache.impl.config.serializer.DefaultSerializerConfiguration;
import org.ehcache.impl.serialization.ByteArraySerializer;
import org.ehcache.impl.serialization.CharSerializer;
import org.ehcache.impl.serialization.CompactJavaSerializer;
import org.ehcache.impl.serialization.DoubleSerializer;
import org.ehcache.impl.serialization.FloatSerializer;
import org.ehcache.impl.serialization.IntegerSerializer;
import org.ehcache.impl.serialization.LongSerializer;
import org.ehcache.impl.serialization.StringSerializer;
import org.ehcache.spi.service.ServiceProvider;
import org.ehcache.spi.serialization.SerializationProvider;
import org.ehcache.spi.serialization.Serializer;
import org.ehcache.spi.serialization.UnsupportedTypeException;
import org.ehcache.core.spi.service.FileBasedPersistenceContext;
import org.ehcache.spi.service.Service;
import org.ehcache.spi.service.ServiceConfiguration;
import org.ehcache.core.collections.ConcurrentWeakIdentityHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Closeable;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
/**
* @author Ludovic Orban
*/
public class DefaultSerializationProvider implements SerializationProvider {
private static final Logger LOG = LoggerFactory.getLogger(DefaultSerializationProvider.class);
protected final Map, Class>> serializers;
final ConcurrentWeakIdentityHashMap, AtomicInteger> providedVsCount = new ConcurrentWeakIdentityHashMap<>();
final Set> instantiated = Collections.newSetFromMap(new ConcurrentWeakIdentityHashMap, Boolean>());
public DefaultSerializationProvider(DefaultSerializationProviderConfiguration configuration) {
if (configuration != null) {
this.serializers = new LinkedHashMap<>(configuration.getDefaultSerializers());
} else {
this.serializers = new LinkedHashMap<>(Collections., Class>>emptyMap());
}
}
@Override
public Serializer createKeySerializer(Class clazz, ClassLoader classLoader, ServiceConfiguration... configs) throws UnsupportedTypeException {
DefaultSerializerConfiguration configuration = find(DefaultSerializerConfiguration.Type.KEY, configs);
Serializer serializer = getUserProvidedSerializer(configuration);
if (serializer == null) {
serializer = createSerializer(clazz, classLoader, configuration, configs);
instantiated.add(serializer);
}
updateProvidedInstanceCounts(serializer);
return serializer;
}
@Override
public Serializer createValueSerializer(Class clazz, ClassLoader classLoader, ServiceConfiguration... configs) throws UnsupportedTypeException {
DefaultSerializerConfiguration configuration = find(DefaultSerializerConfiguration.Type.VALUE, configs);
Serializer serializer = getUserProvidedSerializer(configuration);
if (serializer == null) {
serializer = createSerializer(clazz, classLoader, configuration, configs);
instantiated.add(serializer);
}
updateProvidedInstanceCounts(serializer);
return serializer;
}
private Serializer createSerializer(Class clazz, ClassLoader classLoader, DefaultSerializerConfiguration config, ServiceConfiguration... configs) throws UnsupportedTypeException {
Class> klazz = getSerializerClassFor(clazz, config);
try {
klazz.getConstructor(ClassLoader.class, FileBasedPersistenceContext.class);
LOG.warn(klazz.getName() + " class has a constructor that takes in a FileBasedPersistenceContext. " +
"Support for this constructor has been removed since version 3.2. Consider removing it.");
} catch (NoSuchMethodException e) {
// Ideal
}
try {
return constructSerializer(clazz, klazz.getConstructor(ClassLoader.class), classLoader);
} catch (NoSuchMethodException e) {
throw new RuntimeException(klazz + " does not have a constructor that takes in a ClassLoader.", e);
}
}
private Class> getSerializerClassFor(Class clazz, DefaultSerializerConfiguration config) throws UnsupportedTypeException {
if (config != null) {
Class> configured = config.getClazz();
if (configured != null) {
return configured;
}
}
@SuppressWarnings("unchecked")
Class> direct = (Class>) serializers.get(clazz);
if (direct != null) {
return direct;
}
for (Map.Entry, Class>> entry : serializers.entrySet()) {
if (entry.getKey().isAssignableFrom(clazz)) {
@SuppressWarnings("unchecked")
Class> type = (Class>)entry.getValue();
return type;
}
}
throw new UnsupportedTypeException("No serializer found for type '" + clazz.getName() + "'");
}
private Serializer constructSerializer(Class clazz, Constructor> constructor, Object ... args) {
try {
Serializer serializer = constructor.newInstance(args);
LOG.debug("Serializer for <{}> : {}", clazz.getName(), serializer);
return serializer;
} catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
throw new RuntimeException(e);
} catch (IllegalArgumentException e) {
throw new AssertionError(e);
}
}
private void updateProvidedInstanceCounts(Serializer serializer) {
AtomicInteger currentCount = providedVsCount.putIfAbsent(serializer, new AtomicInteger(1));
if(currentCount != null) {
currentCount.incrementAndGet();
}
}
@Override
public void releaseSerializer(final Serializer serializer) throws IOException {
AtomicInteger currentCount = providedVsCount.get(serializer);
if(currentCount != null) {
if(currentCount.decrementAndGet() < 0) {
currentCount.incrementAndGet();
throw new IllegalArgumentException("Given serializer:" + serializer.getClass().getName() + " is not managed by this provider");
}
} else {
throw new IllegalArgumentException("Given serializer:" + serializer.getClass().getName() + " is not managed by this provider");
}
if(instantiated.remove(serializer)) {
if (serializer instanceof Closeable) {
((Closeable) serializer).close();
}
}
}
@Override
public void start(ServiceProvider serviceProvider) {
addDefaultSerializerIfNoneRegistered(serializers, Serializable.class, CompactJavaSerializer.asTypedSerializer());
addDefaultSerializerIfNoneRegistered(serializers, Long.class, LongSerializer.class);
addDefaultSerializerIfNoneRegistered(serializers, Integer.class, IntegerSerializer.class);
addDefaultSerializerIfNoneRegistered(serializers, Float.class, FloatSerializer.class);
addDefaultSerializerIfNoneRegistered(serializers, Double.class, DoubleSerializer.class);
addDefaultSerializerIfNoneRegistered(serializers, Character.class, CharSerializer.class);
addDefaultSerializerIfNoneRegistered(serializers, String.class, StringSerializer.class);
addDefaultSerializerIfNoneRegistered(serializers, byte[].class, ByteArraySerializer.class);
}
@Override
public void stop() {
// no-op
}
private static void addDefaultSerializerIfNoneRegistered(Map, Class>> serializers, Class clazz, Class> serializerClass) {
if (!serializers.containsKey(clazz)) {
serializers.put(clazz, serializerClass);
}
}
private static Serializer getUserProvidedSerializer(DefaultSerializerConfiguration conf) {
if(conf != null) {
Serializer instance = conf.getInstance();
if(instance != null) {
return instance;
}
}
return null;
}
@SuppressWarnings("unchecked")
private static DefaultSerializerConfiguration find(DefaultSerializerConfiguration.Type type, ServiceConfiguration... serviceConfigurations) {
DefaultSerializerConfiguration result = null;
Collection serializationProviderConfigurations = ServiceUtils.findAmongst(DefaultSerializerConfiguration.class, (Object[]) serviceConfigurations);
for (DefaultSerializerConfiguration serializationProviderConfiguration : serializationProviderConfigurations) {
if (serializationProviderConfiguration.getType() == type) {
if (result != null) {
throw new IllegalArgumentException("Duplicate " + type + " serialization provider : " + serializationProviderConfiguration);
}
result = serializationProviderConfiguration;
}
}
return result;
}
}