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ExecExtensions.cs
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ServiceStack.Common
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ExecExtensions.cs
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Linq
;
using
System
.
Text
;
using
System
.
Threading
;
using
ServiceStack
.
Logging
;
namespace
ServiceStack
.
Common
{
public
static
class
ExecExtensions
{
public
static
void
LogError
(
Type
declaringType
,
string
clientMethodName
,
Exception
ex
)
{
var
log
=
LogManager
.
GetLogger
(
declaringType
)
;
log
.
Error
(
string
.
Format
(
"'{0}' threw an error on {1}: {2}"
,
declaringType
.
FullName
,
clientMethodName
,
ex
.
Message
)
,
ex
)
;
}
public
static
void
ExecAll
<
T
>
(
this
IEnumerable
<
T
>
instances
,
Action
<
T
>
action
)
{
foreach
(
var
instance
in
instances
)
{
try
{
action
(
instance
)
;
}
catch
(
Exception
ex
)
{
LogError
(
instance
.
GetType
(
)
,
action
.
GetType
(
)
.
Name
,
ex
)
;
}
}
}
public
static
void
ExecAllWithFirstOut
<
T
,
TReturn
>
(
this
IEnumerable
<
T
>
instances
,
Func
<
T
,
TReturn
>
action
,
ref
TReturn
firstResult
)
{
foreach
(
var
instance
in
instances
)
{
try
{
var
result
=
action
(
instance
)
;
if
(
!
Equals
(
firstResult
,
default
(
TReturn
)
)
)
{
firstResult
=
result
;
}
}
catch
(
Exception
ex
)
{
LogError
(
instance
.
GetType
(
)
,
action
.
GetType
(
)
.
Name
,
ex
)
;
}
}
}
public
static
TReturn
ExecReturnFirstWithResult
<
T
,
TReturn
>
(
this
IEnumerable
<
T
>
instances
,
Func
<
T
,
TReturn
>
action
)
{
foreach
(
var
instance
in
instances
)
{
try
{
var
result
=
action
(
instance
)
;
if
(
!
Equals
(
result
,
default
(
TReturn
)
)
)
{
return
result
;
}
}
catch
(
Exception
ex
)
{
LogError
(
instance
.
GetType
(
)
,
action
.
GetType
(
)
.
Name
,
ex
)
;
}
}
return
default
(
TReturn
)
;
}
public
static
void
RetryUntilTrue
(
Func
<
bool
>
action
,
TimeSpan
?
timeOut
)
{
var
i
=
0
;
var
firstAttempt
=
DateTime
.
Now
;
while
(
timeOut
==
null
||
DateTime
.
Now
-
firstAttempt
<
timeOut
.
Value
)
{
i
++
;
if
(
action
(
)
)
{
return
;
}
SleepBackOffMultiplier
(
i
)
;
}
throw
new
TimeoutException
(
string
.
Format
(
"Exceeded timeout of {0}"
,
timeOut
.
Value
)
)
;
}
public
static
void
RetryOnException
(
Action
action
,
TimeSpan
?
timeOut
)
{
var
i
=
0
;
Exception
lastEx
=
null
;
var
firstAttempt
=
DateTime
.
Now
;
while
(
timeOut
==
null
||
DateTime
.
Now
-
firstAttempt
<
timeOut
.
Value
)
{
i
++
;
try
{
action
(
)
;
return
;
}
catch
(
Exception
ex
)
{
lastEx
=
ex
;
SleepBackOffMultiplier
(
i
)
;
}
}
throw
new
TimeoutException
(
string
.
Format
(
"Exceeded timeout of {0}"
,
timeOut
.
Value
)
,
lastEx
)
;
}
public
static
void
RetryOnException
(
Action
action
,
int
maxRetries
)
{
for
(
var
i
=
0
;
i
<
maxRetries
;
i
++
)
{
try
{
action
(
)
;
break
;
}
catch
{
if
(
i
==
maxRetries
-
1
)
throw
;
SleepBackOffMultiplier
(
i
)
;
}
}
}
private
static
void
SleepBackOffMultiplier
(
int
i
)
{
//exponential/random retry back-off.
var
rand
=
new
Random
(
Guid
.
NewGuid
(
)
.
GetHashCode
(
)
)
;
var
nextTry
=
rand
.
Next
(
(
int
)
Math
.
Pow
(
i
,
2
)
,
(
int
)
Math
.
Pow
(
i
+
1
,
2
)
+
1
)
;
Thread
.
Sleep
(
nextTry
)
;
}
}
}
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