|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectorg.apache.http.impl.client.cache.ExponentialBackOffSchedulingStrategy
@Contract(threading=SAFE) public class ExponentialBackOffSchedulingStrategy
An implementation that backs off exponentially based on the number of
consecutive failed attempts stored in the
AsynchronousValidationRequest
. It uses the following defaults:
no delay in case it was never tried or didn't fail so far 6 secs delay for one failed attempt (=The following equation is used to calculate the delay for a specific revalidation request:getInitialExpiryInMillis()
) 60 secs delay for two failed attempts 10 mins delay for three failed attempts 100 mins delay for four failed attempts ~16 hours delay for five failed attempts 24 hours delay for six or more failed attempts (=getMaxExpiryInMillis()
)
delay =The resulting delay won't exceedgetInitialExpiryInMillis()
* Math.pow(getBackOffRate()
,AsynchronousValidationRequest.getConsecutiveFailedAttempts()
- 1))
getMaxExpiryInMillis()
.
Field Summary | |
---|---|
static long |
DEFAULT_BACK_OFF_RATE
|
static long |
DEFAULT_INITIAL_EXPIRY_IN_MILLIS
|
static long |
DEFAULT_MAX_EXPIRY_IN_MILLIS
|
Constructor Summary | |
---|---|
ExponentialBackOffSchedulingStrategy(CacheConfig cacheConfig)
Create a new scheduling strategy using a fixed pool of worker threads. |
|
ExponentialBackOffSchedulingStrategy(CacheConfig cacheConfig,
long backOffRate,
long initialExpiryInMillis,
long maxExpiryInMillis)
Create a new scheduling strategy by using a fixed pool of worker threads and the given parameters to calculated the delay. |
Method Summary | ||
---|---|---|
protected long |
calculateDelayInMillis(int consecutiveFailedAttempts)
|
|
protected static long |
checkNotNegative(String parameterName,
long value)
Deprecated. Use Args.notNegative(long, String) |
|
protected static
|
checkNotNull(String parameterName,
T value)
Deprecated. Use Args.notNull(Object, String) |
|
void |
close()
|
|
long |
getBackOffRate()
|
|
long |
getInitialExpiryInMillis()
|
|
long |
getMaxExpiryInMillis()
|
|
void |
schedule(AsynchronousValidationRequest revalidationRequest)
Schedule an AsynchronousValidationRequest to be executed. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public static final long DEFAULT_BACK_OFF_RATE
public static final long DEFAULT_INITIAL_EXPIRY_IN_MILLIS
public static final long DEFAULT_MAX_EXPIRY_IN_MILLIS
Constructor Detail |
---|
public ExponentialBackOffSchedulingStrategy(CacheConfig cacheConfig)
cacheConfig
- the thread pool configuration to be used; not null
CacheConfig.getAsynchronousWorkersMax()
,
DEFAULT_BACK_OFF_RATE
,
DEFAULT_INITIAL_EXPIRY_IN_MILLIS
,
DEFAULT_MAX_EXPIRY_IN_MILLIS
public ExponentialBackOffSchedulingStrategy(CacheConfig cacheConfig, long backOffRate, long initialExpiryInMillis, long maxExpiryInMillis)
cacheConfig
- the thread pool configuration to be used; not null
backOffRate
- the back off rate to be used; not negativeinitialExpiryInMillis
- the initial expiry in milli seconds; not negativemaxExpiryInMillis
- the upper limit of the delay in milli seconds; not negativeCacheConfig.getAsynchronousWorkersMax()
,
ExponentialBackOffSchedulingStrategy
Method Detail |
---|
public void schedule(AsynchronousValidationRequest revalidationRequest)
SchedulingStrategy
AsynchronousValidationRequest
to be executed.
schedule
in interface SchedulingStrategy
revalidationRequest
- the request to be executed; not null
public void close()
close
in interface Closeable
public long getBackOffRate()
public long getInitialExpiryInMillis()
public long getMaxExpiryInMillis()
protected long calculateDelayInMillis(int consecutiveFailedAttempts)
@Deprecated protected static <T> T checkNotNull(String parameterName, T value)
Args.notNull(Object, String)
@Deprecated protected static long checkNotNegative(String parameterName, long value)
Args.notNegative(long, String)
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |