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Issue 489: made a ceiling for retry intervals

This commit is contained in:
Adrian Cole 2011-02-27 16:42:48 -08:00
parent 67a13f439c
commit 3d3770a556
4 changed files with 57 additions and 40 deletions
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8
core/src/main/java/org/jclouds/http/handlers/BackoffLimitedRetryHandler.java
View File

@ -120,8 +120,14 @@ public class BackoffLimitedRetryHandler implements HttpRetryHandler, IOException
}
public void imposeBackoffExponentialDelay(long period, int pow, int failureCount, int max, String commandDescription) {
imposeBackoffExponentialDelay(period, period * 10l, pow, failureCount, max, commandDescription);
}
public void imposeBackoffExponentialDelay(long period, long maxPeriod, int pow, int failureCount, int max,
String commandDescription) {
long delayMs = (long) (period * Math.pow(failureCount, pow));
logger.debug("Retry %d/%d: delaying for %d ms: %s", failureCount, retryCountLimit, delayMs, commandDescription);
delayMs = delayMs > maxPeriod ? maxPeriod : delayMs;
logger.debug("Retry %d/%d: delaying for %d ms: %s", failureCount, max, delayMs, commandDescription);
try {
Thread.sleep(delayMs);
} catch (InterruptedException e) {

21
core/src/main/java/org/jclouds/predicates/RetryablePredicate.java
View File

@ -37,30 +37,33 @@ import com.google.common.base.Predicate;
public class RetryablePredicate<T> implements Predicate<T> {
private final long maxWait;
private final long period;
private final long maxPeriod;
private final Predicate<T> predicate;
@Resource
protected Logger logger = Logger.NULL;
public RetryablePredicate(Predicate<T> predicate, long maxWait, long period,
TimeUnit unit) {
public RetryablePredicate(Predicate<T> predicate, long maxWait, long period, long maxPeriod, TimeUnit unit) {
this.predicate = predicate;
this.maxWait = unit.toMillis(maxWait);
this.period = unit.toMillis(period);
this.maxPeriod = unit.toMillis(maxPeriod);
}
public RetryablePredicate(Predicate<T> predicate, long maxWait, long period, TimeUnit unit) {
this(predicate, maxWait, period, period * 10l, unit);
}
public RetryablePredicate(Predicate<T> predicate, long maxWait) {
this.predicate = predicate;
this.maxWait = maxWait;
this.period = 50l;
this(predicate, maxWait, 50l, 1000l, TimeUnit.MILLISECONDS);
}
@Override
public boolean apply(T input) {
try {
long i = 1l;
for (Date end = new Date(System.currentTimeMillis() + maxWait); before(end); Thread
.sleep(nextMaxInterval(i++, end))) {
for (Date end = new Date(System.currentTimeMillis() + maxWait); before(end); Thread.sleep(nextMaxInterval(i++,
end))) {
if (predicate.apply(input)) {
return true;
} else if (atOrAfter(end)) {
@ -68,14 +71,14 @@ public class RetryablePredicate<T> implements Predicate<T> {
}
}
} catch (InterruptedException e) {
logger.warn(e, "predicate %s on %s interrupted, returning false",
input, predicate);
logger.warn(e, "predicate %s on %s interrupted, returning false", input, predicate);
}
return false;
}
long nextMaxInterval(long attempt, Date end) {
long interval = (period * (long) Math.pow(attempt, 1.5));
interval = interval > maxPeriod ? maxPeriod : interval;
long max = end.getTime() - System.currentTimeMillis();
return (interval > max) ? max : interval;
}

10
core/src/test/java/org/jclouds/http/handlers/BackoffLimitedRetryHandlerTest.java
View File

@ -61,7 +61,7 @@ public class BackoffLimitedRetryHandlerTest {
BackoffLimitedRetryHandler handler = new BackoffLimitedRetryHandler();
@Test
void testExponentialBackoffDelay() throws InterruptedException {
void testExponentialBackoffDelayDefaultMaxInterval500() throws InterruptedException {
long acceptableDelay = 25; // Delay to forgive if tests run long.
long startTime = System.nanoTime();
@ -85,14 +85,14 @@ public class BackoffLimitedRetryHandlerTest {
startTime = System.nanoTime();
handler.imposeBackoffExponentialDelay(4, "TEST FAILURE: 4");
elapsedTime = (System.nanoTime() - startTime) / 1000000;
assert (elapsedTime >= 799) : elapsedTime;
assertTrue(elapsedTime < 800 + acceptableDelay * 2);
assert (elapsedTime >= 499) : elapsedTime;
assertTrue(elapsedTime < 550 + acceptableDelay * 2);
startTime = System.nanoTime();
handler.imposeBackoffExponentialDelay(5, "TEST FAILURE: 5");
elapsedTime = (System.nanoTime() - startTime) / 1000000;
assert (elapsedTime >= 1249) : elapsedTime;
assertTrue(elapsedTime < 1250 + acceptableDelay * 2);
assert (elapsedTime >= 499) : elapsedTime;
assertTrue(elapsedTime < 550 + acceptableDelay * 2);
}
TransformingHttpCommandExecutorServiceImpl executorService;

56
core/src/test/java/org/jclouds/predicates/RetryablePredicateTest.java
View File

@ -37,55 +37,63 @@ public class RetryablePredicateTest {
@Test
void testAlwaysTrue() {
RetryablePredicate<String> predicate = new RetryablePredicate<String>(Predicates
.<String> alwaysTrue(), 3, 1, TimeUnit.SECONDS);
Date startPlusSecond = new Date(System.currentTimeMillis() + 1000);
RetryablePredicate<String> predicate = new RetryablePredicate<String>(Predicates.<String> alwaysTrue(), 3, 1,
TimeUnit.SECONDS);
Date startPlusThird = new Date(System.currentTimeMillis() + 1000);
predicate.apply("");
Date now = new Date();
assert now.compareTo(startPlusSecond) < 0 : String.format("%s should be less than %s", now,
startPlusSecond);
assert now.compareTo(startPlusThird) < 0 : String.format("%s should be less than %s", now, startPlusThird);
}
@Test
void testAlwaysFalseMillis() {
RetryablePredicate<String> predicate = new RetryablePredicate<String>(Predicates
.<String> alwaysFalse(), 3, 1, TimeUnit.SECONDS);
Date startPlus3Seconds = new Date(System.currentTimeMillis() + 3000);
Date startPlus4Seconds = new Date(System.currentTimeMillis() + 4000);
RetryablePredicate<String> predicate = new RetryablePredicate<String>(Predicates.<String> alwaysFalse(), 3, 1,
TimeUnit.SECONDS);
Date startPlus3Thirds = new Date(System.currentTimeMillis() + 3000);
Date startPlus4Thirds = new Date(System.currentTimeMillis() + 4000);
predicate.apply("");
Date now = new Date();
assert now.compareTo(startPlus3Seconds) >= 0 : String.format("%s should be less than %s",
startPlus3Seconds, now);
assert now.compareTo(startPlus4Seconds) <= 0 : String.format("%s should be greater than %s",
startPlus4Seconds, now);
assert now.compareTo(startPlus3Thirds) >= 0 : String.format("%s should be less than %s", startPlus3Thirds, now);
assert now.compareTo(startPlus4Thirds) <= 0 : String
.format("%s should be greater than %s", startPlus4Thirds, now);
}
private static class SecondTimeTrue implements Predicate<String> {
private static class ThirdTimeTrue implements Predicate<String> {
private int count = 0;
@Override
public boolean apply(String input) {
return count++ == 1;
return count++ == 2;
}
}
@Test
void testSecondTimeTrue() {
RetryablePredicate<String> predicate = new RetryablePredicate<String>(new SecondTimeTrue(),
3, 1, TimeUnit.SECONDS);
void testThirdTimeTrue() {
RetryablePredicate<String> predicate = new RetryablePredicate<String>(new ThirdTimeTrue(), 3, 1, TimeUnit.SECONDS);
Date startPlusSecond = new Date(System.currentTimeMillis() + 1000);
Date startPlus2Seconds = new Date(System.currentTimeMillis() + 2000);
Date startPlus = new Date(System.currentTimeMillis() + 1000);
Date startPlus3 = new Date(System.currentTimeMillis() + 3000);
predicate.apply("");
Date now = new Date();
assert now.compareTo(startPlusSecond) >= 0 : String.format("%s should be greater than %s",
now, startPlusSecond);
assert now.compareTo(startPlus2Seconds) <= 0 : String.format("%s should be greater than %s",
startPlus2Seconds, now);
assert now.compareTo(startPlus) >= 0 : String.format("%s should be greater than %s", now, startPlus);
assert now.compareTo(startPlus3) <= 0 : String.format("%s should be greater than %s", startPlus3, now);
}
@Test
void testThirdTimeTrueLimitedMaxInterval() {
RetryablePredicate<String> predicate = new RetryablePredicate<String>(new ThirdTimeTrue(), 3, 1, 1,
TimeUnit.SECONDS);
Date startPlus = new Date(System.currentTimeMillis() + 1000);
Date startPlus2 = new Date(System.currentTimeMillis() + 2000);
predicate.apply("");
Date now = new Date();
assert now.compareTo(startPlus) >= 0 : String.format("%s should be greater than %s", now, startPlus);
assert now.compareTo(startPlus2) <= 0 : String.format("%s should be greater than %s", startPlus2, now);
}
}