org.hypoport.springGuavaCacheAdapter.SpringGuavaCacheAdapter.java Source code

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Here is the source code for org.hypoport.springGuavaCacheAdapter.SpringGuavaCacheAdapter.java

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/**
 *  Copyright 2012 HYPOPORT AG
 *
 *  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.hypoport.springGuavaCacheAdapter;

import com.google.common.base.Optional;
import com.google.common.cache.CacheBuilder;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.cache.Cache;
import org.springframework.cache.support.SimpleValueWrapper;

import static java.util.concurrent.TimeUnit.SECONDS;

public class SpringGuavaCacheAdapter implements Cache, BeanNameAware, InitializingBean {

    private String name;
    private com.google.common.cache.Cache<Object, Optional<Object>> cache;
    private Long maximumSize;
    private Long expireAfterAccessInSeconds;
    private Long expireAfterWriteInSeconds;

    @Override
    public void afterPropertiesSet() throws Exception {
        assertRequiredName();
        createGuavaCache();
    }

    private void assertRequiredName() {
        if (name == null || name.length() == 0) {
            throw new IllegalArgumentException("name required");
        }
    }

    private void createGuavaCache() {
        CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
        if (maximumSize != null) {
            builder.maximumSize(maximumSize);
        }
        if (expireAfterAccessInSeconds != null) {
            builder.expireAfterAccess(expireAfterAccessInSeconds, SECONDS);
        }
        if (expireAfterWriteInSeconds != null) {
            builder.expireAfterWrite(expireAfterWriteInSeconds, SECONDS);
        }
        cache = builder.build();
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public com.google.common.cache.Cache<Object, Optional<Object>> getNativeCache() {
        return cache;
    }

    @Override
    public ValueWrapper get(Object key) {
        Optional<Object> value = cache.getIfPresent(key);
        return (value != null ? new SimpleValueWrapper(value.orNull()) : null);
    }

    @Override
    public void put(Object key, Object value) {
        cache.put(key, Optional.fromNullable(value));
    }

    @Override
    public void evict(Object key) {
        cache.invalidate(key);
    }

    @Override
    public void clear() {
        cache.invalidateAll();
    }

    @Override
    public void setBeanName(String name) {
        this.name = name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setMaximumSize(long maximumSize) {
        this.maximumSize = maximumSize;
    }

    public void setExpireAfterAccessInSeconds(long expireAfterAccessInSeconds) {
        this.expireAfterAccessInSeconds = expireAfterAccessInSeconds;
    }

    public void setExpireAfterWriteInSeconds(long expireAfterWriteInSeconds) {
        this.expireAfterWriteInSeconds = expireAfterWriteInSeconds;
    }
}