POICacheManager.java
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package com.bckefu.excel.cache.manager;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Arrays;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
/**
* @author caoliang1918@aliyun.com
* @Date 2017/11/5:22:58
*/
public final class POICacheManager {
private static final Logger LOGGER = LoggerFactory
.getLogger(POICacheManager.class);
private static LoadingCache<String, byte[]> loadingCache;
private static IFileLoader fileLoder;
@SuppressWarnings("AlibabaThreadLocalShouldRemove")
private static ThreadLocal<IFileLoader> LOCAL_FILELOADER = new ThreadLocal<IFileLoader>();
static {
loadingCache = CacheBuilder.newBuilder().expireAfterWrite(1, TimeUnit.HOURS).maximumSize(50)
.build(new CacheLoader<String, byte[]>() {
@Override
public byte[] load(String url) throws Exception {
if (LOCAL_FILELOADER.get() != null) {
return LOCAL_FILELOADER.get().getFile(url);
}
return fileLoder.getFile(url);
}
});
//设置默认实现
fileLoder = new FileLoaderImpl();
}
public static InputStream getFile(String id) {
try {
//复杂数据,防止操作原数据
byte[] result = Arrays.copyOf(loadingCache.get(id), loadingCache.get(id).length);
return new ByteArrayInputStream(result);
} catch (ExecutionException e) {
LOGGER.error(e.getMessage(), e);
}
return null;
}
public static void setFileLoder(IFileLoader fileLoder) {
POICacheManager.fileLoder = fileLoder;
}
/**
* 一次线程有效
*
* @param fileLoder
*/
public static void setFileLoderOnce(IFileLoader fileLoder) {
if (fileLoder != null) {
LOCAL_FILELOADER.set(fileLoder);
}
}
public static void setLoadingCache(LoadingCache<String, byte[]> loadingCache) {
POICacheManager.loadingCache = loadingCache;
}
}