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| package cn.holelin.project.task;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.RandomUtil;
import com.google.common.collect.Lists;
import cn.holelin.project.constants.StringConstants;
import cn.holelin.project.domain.DownloadDicom;
import cn.holelin.project.exception.BusinessException;
import cn.holelin.project.service.OssService;
import cn.holelin.project.utils.SnowflakeUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.util.Arrays;
import java.io.File;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.RecursiveTask;
@Slf4j
public class DownloadDicomTask extends RecursiveTask<List<String>> {
private static final Integer DIRECT_HANDLE_NUM = 20;
private final DownloadDicom downloadDicom;
private final OssService ossService;
public DownloadDicomTask(DownloadDicom downloadDicom, OssService ossService) {
this.downloadDicom = downloadDicom;
this.ossService = ossService;
}
@Override
protected List<String> compute() {
final List<String> objectNameList = downloadDicom.getObjectNameList();
final String downloadFileDir = downloadDicom.getDownloadFileDir();
if (CollUtil.isEmpty(objectNameList)) {
log.error("任务为空,无法下载");
return Collections.emptyList();
}
final ArrayList<String> result = Lists.newArrayList();
final int size = objectNameList.size();
if (size < DIRECT_HANDLE_NUM) {
result.addAll(directHandler(objectNameList, downloadFileDir));
} else {
final int middle = size / 2;
final DownloadDicomTask downloadDicomTask1 = new DownloadDicomTask(DownloadDicom.builder()
.downloadFileDir(downloadFileDir)
.objectNameList(objectNameList.subList(0, middle))
.build(), ossService);
final DownloadDicomTask downloadDicomTask2 = new DownloadDicomTask(DownloadDicom.builder()
.downloadFileDir(downloadFileDir)
.objectNameList(objectNameList.subList(middle, size))
.build(), ossService);
downloadDicomTask1.fork();
downloadDicomTask2.fork();
result.addAll(downloadDicomTask1.join());
result.addAll(downloadDicomTask2.join());
}
return result;
}
private List<String> directHandler(List<String> objectNameList, String downloadFileDir) {
final ArrayList<String> filePathList = Lists.newArrayList();
for (String objectName : objectNameList) {
String fileName = getObjectNameFileName(objectName);
if (StringUtils.isEmpty(fileName)) {
fileName = SnowflakeUtil.genId();
}
final File currentDownloadDir = Paths.get(downloadFileDir + File.separator + SnowflakeUtil.genId()).toFile();
if (!currentDownloadDir.exists()) {
currentDownloadDir.mkdir();
}
String filePath = currentDownloadDir.getAbsolutePath() + File.separator + fileName;
final boolean exists = Paths.get(filePath).toFile().exists();
if (exists) {
final String flag = RandomUtil.randomInt(1000) + "_";
filePath = downloadFileDir + File.separator + flag + fileName;
}
try {
ossService.download(objectName, filePath);
} catch (BusinessException e) {
e.printStackTrace();
}
filePathList.add(filePath);
}
return filePathList;
}
public String getObjectNameFileName(String objectName) {
if (StringUtils.isEmpty(objectName)) {
return StringConstants.EMPTY_STRING;
}
final String[] split = objectName.split(StringConstants.SYMBOL_SLASH);
if (Arrays.isNullOrEmpty(split)) {
return StringConstants.EMPTY_STRING;
}
return split[split.length - 1];
}
}
|
