hadoop DateTimeUtils 源码
haddop DateTimeUtils 代码
文件路径：/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/utils/DateTimeUtils.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.fs.azurebfs.utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.util.Date;
import java.util.Locale;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.DEFAULT_CLOCK_SKEW_WITH_SERVER_IN_MS;
public final class DateTimeUtils {
private static final Logger LOG = LoggerFactory.getLogger(DateTimeUtils.class);
private static final String DATE_TIME_PATTERN = "E, dd MMM yyyy HH:mm:ss z";
public static long parseLastModifiedTime(final String lastModifiedTime) {
long parsedTime = 0;
try {
Date utcDate = new SimpleDateFormat(DATE_TIME_PATTERN, Locale.US)
.parse(lastModifiedTime);
parsedTime = utcDate.getTime();
} catch (ParseException e) {
LOG.error("Failed to parse the date {}", lastModifiedTime);
} finally {
return parsedTime;
}
}
/**
* Tries to identify if an operation was recently executed based on the LMT of
* a file or folder. LMT needs to be more recent that the original request
* start time. To include any clock skew with server, LMT within
* DEFAULT_CLOCK_SKEW_WITH_SERVER_IN_MS from the request start time is going
* to be considered to qualify for recent operation.
* @param lastModifiedTime File/Folder LMT
* @param expectedLMTUpdateTime original request timestamp which should
* have updated the LMT on target
* @return true if the LMT is within timespan for recent operation, else false
*/
public static boolean isRecentlyModified(final String lastModifiedTime,
final Instant expectedLMTUpdateTime) {
long lmtEpochTime = DateTimeUtils.parseLastModifiedTime(lastModifiedTime);
long currentEpochTime = expectedLMTUpdateTime.toEpochMilli();
return ((lmtEpochTime > currentEpochTime)
|| ((currentEpochTime - lmtEpochTime) <= DEFAULT_CLOCK_SKEW_WITH_SERVER_IN_MS));
}
private DateTimeUtils() {
}
}
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