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Measurements.java
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Wed, Jul 31, 07:38
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text/x-java
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R7507 YCSB
Measurements.java
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/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
*
* Licensed 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. See accompanying
* LICENSE file.
*/
package
com.yahoo.ycsb.measurements
;
import
java.io.IOException
;
import
java.util.Properties
;
import
java.util.concurrent.ConcurrentHashMap
;
import
com.yahoo.ycsb.measurements.exporter.MeasurementsExporter
;
/**
* Collects latency measurements, and reports them when requested.
*
* @author cooperb
*
*/
public
class
Measurements
{
public
static
final
String
MEASUREMENT_TYPE_PROPERTY
=
"measurementtype"
;
private
static
final
String
MEASUREMENT_TYPE_PROPERTY_DEFAULT
=
"histogram"
;
private
static
final
String
MEASUREMENT_INTERVAL
=
"measurement.interval"
;
private
static
final
String
MEASUREMENT_INTERVAL_DEFAULT
=
"op"
;
static
Measurements
singleton
=
null
;
static
Properties
measurementproperties
=
null
;
public
static
void
setProperties
(
Properties
props
)
{
measurementproperties
=
props
;
}
/**
* Return the singleton Measurements object.
*/
public
synchronized
static
Measurements
getMeasurements
()
{
if
(
singleton
==
null
)
{
singleton
=
new
Measurements
(
measurementproperties
);
}
return
singleton
;
}
final
ConcurrentHashMap
<
String
,
OneMeasurement
>
_opToMesurementMap
;
final
ConcurrentHashMap
<
String
,
OneMeasurement
>
_opToIntendedMesurementMap
;
final
int
_measurementType
;
final
int
_measurementInterval
;
private
Properties
_props
;
/**
* Create a new object with the specified properties.
*/
public
Measurements
(
Properties
props
)
{
_opToMesurementMap
=
new
ConcurrentHashMap
<
String
,
OneMeasurement
>();
_opToIntendedMesurementMap
=
new
ConcurrentHashMap
<
String
,
OneMeasurement
>();
_props
=
props
;
String
mTypeString
=
_props
.
getProperty
(
MEASUREMENT_TYPE_PROPERTY
,
MEASUREMENT_TYPE_PROPERTY_DEFAULT
);
if
(
mTypeString
.
equals
(
"histogram"
))
{
_measurementType
=
0
;
}
else
if
(
mTypeString
.
equals
(
"hdrhistogram"
))
{
_measurementType
=
1
;
}
else
if
(
mTypeString
.
equals
(
"hdrhistogram+histogram"
))
{
_measurementType
=
2
;
}
else
if
(
mTypeString
.
equals
(
"timeseries"
))
{
_measurementType
=
3
;
}
else
{
throw
new
IllegalArgumentException
(
"unknown "
+
MEASUREMENT_TYPE_PROPERTY
+
"="
+
mTypeString
);
}
String
mIntervalString
=
_props
.
getProperty
(
MEASUREMENT_INTERVAL
,
MEASUREMENT_INTERVAL_DEFAULT
);
if
(
mIntervalString
.
equals
(
"op"
))
{
_measurementInterval
=
0
;
}
else
if
(
mIntervalString
.
equals
(
"intended"
))
{
_measurementInterval
=
1
;
}
else
if
(
mIntervalString
.
equals
(
"both"
))
{
_measurementInterval
=
2
;
}
else
{
throw
new
IllegalArgumentException
(
"unknown "
+
MEASUREMENT_INTERVAL
+
"="
+
mIntervalString
);
}
}
OneMeasurement
constructOneMeasurement
(
String
name
)
{
switch
(
_measurementType
)
{
case
0
:
return
new
OneMeasurementHistogram
(
name
,
_props
);
case
1
:
return
new
OneMeasurementHdrHistogram
(
name
,
_props
);
case
2
:
return
new
TwoInOneMeasurement
(
name
,
new
OneMeasurementHdrHistogram
(
"Hdr"
+
name
,
_props
),
new
OneMeasurementHistogram
(
"Bucket"
+
name
,
_props
));
default
:
return
new
OneMeasurementTimeSeries
(
name
,
_props
);
}
}
static
class
StartTimeHolder
{
long
time
;
long
startTime
(){
if
(
time
==
0
)
{
return
System
.
nanoTime
();
}
else
{
return
time
;
}
}
}
ThreadLocal
<
StartTimeHolder
>
tlIntendedStartTime
=
new
ThreadLocal
<
Measurements
.
StartTimeHolder
>(){
protected
StartTimeHolder
initialValue
()
{
return
new
StartTimeHolder
();
};
};
public
void
setIntendedStartTimeNs
(
long
time
){
if
(
_measurementInterval
==
0
)
return
;
tlIntendedStartTime
.
get
().
time
=
time
;
}
public
long
getIntendedtartTimeNs
(){
if
(
_measurementInterval
==
0
)
return
0
L
;
return
tlIntendedStartTime
.
get
().
startTime
();
}
/**
* Report a single value of a single metric. E.g. for read latency, operation="READ" and latency is the measured
* value.
*/
public
void
measure
(
String
operation
,
int
latency
)
{
if
(
_measurementInterval
==
1
)
return
;
try
{
OneMeasurement
m
=
getOpMeasurement
(
operation
);
m
.
measure
(
latency
);
}
// This seems like a terribly hacky way to cover up for a bug in the measurement code
catch
(
java
.
lang
.
ArrayIndexOutOfBoundsException
e
)
{
System
.
out
.
println
(
"ERROR: java.lang.ArrayIndexOutOfBoundsException - ignoring and continuing"
);
e
.
printStackTrace
();
e
.
printStackTrace
(
System
.
out
);
}
}
/**
* Report a single value of a single metric. E.g. for read latency, operation="READ" and latency is the measured
* value.
*/
public
void
measureIntended
(
String
operation
,
int
latency
)
{
if
(
_measurementInterval
==
0
)
return
;
try
{
OneMeasurement
m
=
getOpIntendedMeasurement
(
operation
);
m
.
measure
(
latency
);
}
// This seems like a terribly hacky way to cover up for a bug in the measurement code
catch
(
java
.
lang
.
ArrayIndexOutOfBoundsException
e
)
{
System
.
out
.
println
(
"ERROR: java.lang.ArrayIndexOutOfBoundsException - ignoring and continuing"
);
e
.
printStackTrace
();
e
.
printStackTrace
(
System
.
out
);
}
}
private
OneMeasurement
getOpMeasurement
(
String
operation
)
{
OneMeasurement
m
=
_opToMesurementMap
.
get
(
operation
);
if
(
m
==
null
)
{
m
=
constructOneMeasurement
(
operation
);
OneMeasurement
oldM
=
_opToMesurementMap
.
putIfAbsent
(
operation
,
m
);
if
(
oldM
!=
null
)
{
m
=
oldM
;
}
}
return
m
;
}
private
OneMeasurement
getOpIntendedMeasurement
(
String
operation
)
{
OneMeasurement
m
=
_opToIntendedMesurementMap
.
get
(
operation
);
if
(
m
==
null
)
{
final
String
name
=
_measurementInterval
==
1
?
operation
:
"Intended-"
+
operation
;
m
=
constructOneMeasurement
(
name
);
OneMeasurement
oldM
=
_opToIntendedMesurementMap
.
putIfAbsent
(
operation
,
m
);
if
(
oldM
!=
null
)
{
m
=
oldM
;
}
}
return
m
;
}
/**
* Report a return code for a single DB operation.
*/
public
void
reportReturnCode
(
String
operation
,
int
code
)
{
OneMeasurement
m
=
_measurementInterval
==
1
?
getOpIntendedMeasurement
(
operation
)
:
getOpMeasurement
(
operation
);
m
.
reportReturnCode
(
code
);
}
/**
* Export the current measurements to a suitable format.
*
* @param exporter Exporter representing the type of format to write to.
* @throws IOException Thrown if the export failed.
*/
public
void
exportMeasurements
(
MeasurementsExporter
exporter
)
throws
IOException
{
for
(
OneMeasurement
measurement
:
_opToMesurementMap
.
values
())
{
measurement
.
exportMeasurements
(
exporter
);
}
for
(
OneMeasurement
measurement
:
_opToIntendedMesurementMap
.
values
())
{
measurement
.
exportMeasurements
(
exporter
);
}
}
/**
* Return a one line summary of the measurements.
*/
public
synchronized
String
getSummary
()
{
String
ret
=
""
;
for
(
OneMeasurement
m
:
_opToMesurementMap
.
values
())
{
ret
+=
m
.
getSummary
()+
" "
;
}
for
(
OneMeasurement
m
:
_opToIntendedMesurementMap
.
values
())
{
ret
+=
m
.
getSummary
()+
" "
;
}
return
ret
;
}
}
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