public static ObjectStat getFileStat(
OSSObjectOperation objectOperation, String bucketName, String key) {
GenericRequest genericRequest = new GenericRequest(bucketName, key);
SimplifiedObjectMeta meta = objectOperation.getSimplifiedObjectMeta(genericRequest);
ObjectStat objStat = new ObjectStat();
objStat.size = meta.getSize();
objStat.lastModified = meta.getLastModified();
objStat.digest = meta.getETag();
return objStat;
}
/** 判读Object与checkpoint中记录的信息是否相符，即Object是否修改过 */
public synchronized boolean isValid(OSSObjectOperation objectOperation) {
// 比较checkpoint的magic和md5
if (this.magic == null || !this.magic.equals(DOWNLOAD_MAGIC) || this.md5 != hashCode()) {
return false;
}
GenericRequest genericRequest = new GenericRequest(bucketName, objectKey);
SimplifiedObjectMeta meta = objectOperation.getSimplifiedObjectMeta(genericRequest);
// Object的大小、最后修改时间、ETAG相同
if (this.objectStat.size != meta.getSize()
|| !this.objectStat.lastModified.equals(meta.getLastModified())
|| !this.objectStat.digest.equals(meta.getETag())) {
return false;
}
return true;
}