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Shiro cache Integration Adapter.
There is a newer version: 2.5.0
/**
 * Copyright (c) 2016-2019, Bosco.Liao ([email protected]).
 *
 * 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.iherus.shiro.cache.redis;

import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;
import java.util.function.Supplier;

import org.apache.shiro.util.ClassUtils;
import org.iherus.shiro.cache.redis.connection.RedisConnection;
import org.iherus.shiro.cache.redis.connection.RedisConnectionFactory;
import org.iherus.shiro.cache.redis.serializer.DefaultSerializer;
import org.iherus.shiro.cache.redis.serializer.FstSerializer;
import org.iherus.shiro.cache.redis.serializer.ValueSerializer;
import org.iherus.shiro.exception.ExecutionException;

/**
 * 根据FST依赖包的引入与否，将FstSerializer设定为默认的ValueSerializer
 * 
 * @author Bosco.Liao
 * @since 2.0.0
 */
public abstract class AbstractRedisOperations implements RedisOperations {

	private static final Supplier VS_SUPPLIER = new Supplier() {

		final AtomicReference vsRef = new AtomicReference<>();

		@Override
		public ValueSerializer get() {
			ValueSerializer serializer = vsRef.get();
			if (serializer != null)
				return serializer;
			serializer = ClassUtils.isAvailable("org.nustaq.serialization.FSTConfiguration") ? new FstSerializer()
					: DefaultSerializer.INSTANCE;
			return vsRef.compareAndSet(null, serializer) ? serializer : vsRef.get();
		}
	};

	/**
	 * If the {@literal FST.jar} is added, the {@literal FstSerializer} will be the default Serializer.
	 */
	@Override
	public ValueSerializer getValueSerializer() {
		return VS_SUPPLIER.get();
	}
	
	/**
	 * Implementation of {@link RedisOperations}.
	 */
	static class DefaultRedisOperations extends AbstractRedisOperations {

		private final RedisConnectionFactory connectionFactory;

		DefaultRedisOperations(RedisConnectionFactory connectionFactory) {
			this.connectionFactory = connectionFactory;
		}

		@Override
		public RedisConnectionFactory getConnectionFactory() {
			return connectionFactory;
		}

		public RedisConnectionFactory getRequiredConnectionFactory() {
			RedisConnectionFactory connectionFactory = getConnectionFactory();
			if (connectionFactory == null) {
				throw new IllegalStateException("RedisConnectionFactory is required");
			}
			return connectionFactory;
		}

		@Override
		public  T execute(Function action) throws ExecutionException {
			RedisConnectionFactory factory = getRequiredConnectionFactory();
			RedisConnection connection = null;
			try {
				connection = factory.getConnection();
				return action.apply(connection);
			} catch (Exception e) {
				throw new ExecutionException("Unable to execute redis command normally.", e);
			} finally {
				connection.close();
			}
		}

	}

}