/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.retry;
import alluxio.util.CommonUtils;
import com.google.common.base.Preconditions;
import javax.annotation.concurrent.NotThreadSafe;
/**
* A retry policy which allows retrying until a specified timeout is reached.
*/
@NotThreadSafe
public class TimeoutRetry implements RetryPolicy {
private final long mRetryTimeoutMs;
private final long mSleepMs;
private long mStartMs = 0;
private int mCount = 0;
/**
* Constructs a retry facility which allows retrying until a specified timeout is reached.
*
* @param retryTimeoutMs maximum period of time to retry for, in milliseconds
* @param sleepMs time in milliseconds to sleep before retrying
*/
public TimeoutRetry(long retryTimeoutMs, int sleepMs) {
Preconditions.checkArgument(retryTimeoutMs > 0, "Retry timeout must be a positive number");
Preconditions.checkArgument(sleepMs >= 0, "sleepMs cannot be negative");
mRetryTimeoutMs = retryTimeoutMs;
mSleepMs = sleepMs;
}
@Override
public int getRetryCount() {
return mCount;
}
@Override
public boolean attemptRetry() {
if (mCount == 0) {
// first attempt
mStartMs = CommonUtils.getCurrentMs();
mCount++;
return true;
}
if (mSleepMs > 0) {
CommonUtils.sleepMs(mSleepMs);
}
if ((CommonUtils.getCurrentMs() - mStartMs) <= mRetryTimeoutMs) {
mCount++;
return true;
}
return false;
}
}