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DBWrapper.java
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Created
Wed, May 22, 04:12
Size
7 KB
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text/x-java
Expires
Fri, May 24, 04:12 (2 d)
Engine
blob
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Raw Data
Handle
17812483
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R7507 YCSB
DBWrapper.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
;
import
java.util.HashMap
;
import
java.util.Properties
;
import
java.util.Set
;
import
java.util.Vector
;
import
com.yahoo.ycsb.measurements.Measurements
;
/**
* Wrapper around a "real" DB that measures latencies and counts return codes.
*/
public
class
DBWrapper
extends
DB
{
DB
_db
;
Measurements
_measurements
;
public
DBWrapper
(
DB
db
)
{
_db
=
db
;
_measurements
=
Measurements
.
getMeasurements
();
}
/**
* Set the properties for this DB.
*/
public
void
setProperties
(
Properties
p
)
{
_db
.
setProperties
(
p
);
}
/**
* Get the set of properties for this DB.
*/
public
Properties
getProperties
()
{
return
_db
.
getProperties
();
}
/**
* Initialize any state for this DB.
* Called once per DB instance; there is one DB instance per client thread.
*/
public
void
init
()
throws
DBException
{
_db
.
init
();
}
/**
* Cleanup any state for this DB.
* Called once per DB instance; there is one DB instance per client thread.
*/
public
void
cleanup
()
throws
DBException
{
long
ist
=
_measurements
.
getIntendedtartTimeNs
();
long
st
=
System
.
nanoTime
();
_db
.
cleanup
();
long
en
=
System
.
nanoTime
();
measure
(
"CLEANUP"
,
ist
,
st
,
en
);
}
/**
* Read a record from the database. Each field/value pair from the result will be stored in a HashMap.
*
* @param table The name of the table
* @param key The record key of the record to read.
* @param fields The list of fields to read, or null for all of them
* @param result A HashMap of field/value pairs for the result
* @return The result of the operation.
*/
public
Status
read
(
String
table
,
String
key
,
Set
<
String
>
fields
,
HashMap
<
String
,
ByteIterator
>
result
)
{
long
ist
=
_measurements
.
getIntendedtartTimeNs
();
long
st
=
System
.
nanoTime
();
Status
res
=
_db
.
read
(
table
,
key
,
fields
,
result
);
long
en
=
System
.
nanoTime
();
measure
(
"READ"
,
ist
,
st
,
en
);
_measurements
.
reportStatus
(
"READ"
,
res
);
return
res
;
}
/**
* Perform a range scan for a set of records in the database. Each field/value pair from the result will be stored in a HashMap.
*
* @param table The name of the table
* @param startkey The record key of the first record to read.
* @param recordcount The number of records to read
* @param fields The list of fields to read, or null for all of them
* @param result A Vector of HashMaps, where each HashMap is a set field/value pairs for one record
* @return The result of the operation.
*/
public
Status
scan
(
String
table
,
String
startkey
,
int
recordcount
,
Set
<
String
>
fields
,
Vector
<
HashMap
<
String
,
ByteIterator
>>
result
)
{
long
ist
=
_measurements
.
getIntendedtartTimeNs
();
long
st
=
System
.
nanoTime
();
Status
res
=
_db
.
scan
(
table
,
startkey
,
recordcount
,
fields
,
result
);
long
en
=
System
.
nanoTime
();
measure
(
"SCAN"
,
ist
,
st
,
en
);
_measurements
.
reportStatus
(
"SCAN"
,
res
);
return
res
;
}
private
void
measure
(
String
op
,
long
intendedStartTimeNanos
,
long
startTimeNanos
,
long
endTimeNanos
)
{
_measurements
.
measure
(
op
,
(
int
)((
endTimeNanos
-
startTimeNanos
)/
1000
));
_measurements
.
measureIntended
(
op
,
(
int
)((
endTimeNanos
-
intendedStartTimeNanos
)/
1000
));
}
/**
* Update a record in the database. Any field/value pairs in the specified values HashMap will be written into the record with the specified
* record key, overwriting any existing values with the same field name.
*
* @param table The name of the table
* @param key The record key of the record to write.
* @param values A HashMap of field/value pairs to update in the record
* @return The result of the operation.
*/
public
Status
update
(
String
table
,
String
key
,
HashMap
<
String
,
ByteIterator
>
values
)
{
long
ist
=
_measurements
.
getIntendedtartTimeNs
();
long
st
=
System
.
nanoTime
();
Status
res
=
_db
.
update
(
table
,
key
,
values
);
long
en
=
System
.
nanoTime
();
measure
(
"UPDATE"
,
ist
,
st
,
en
);
_measurements
.
reportStatus
(
"UPDATE"
,
res
);
return
res
;
}
/**
* Insert a record in the database. Any field/value pairs in the specified values HashMap will be written into the record with the specified
* record key.
*
* @param table The name of the table
* @param key The record key of the record to insert.
* @param values A HashMap of field/value pairs to insert in the record
* @return The result of the operation.
*/
public
Status
insert
(
String
table
,
String
key
,
HashMap
<
String
,
ByteIterator
>
values
)
{
long
ist
=
_measurements
.
getIntendedtartTimeNs
();
long
st
=
System
.
nanoTime
();
Status
res
=
_db
.
insert
(
table
,
key
,
values
);
long
en
=
System
.
nanoTime
();
measure
(
"INSERT"
,
ist
,
st
,
en
);
_measurements
.
reportStatus
(
"INSERT"
,
res
);
return
res
;
}
/**
* Delete a record from the database.
*
* @param table The name of the table
* @param key The record key of the record to delete.
* @return The result of the operation.
*/
public
Status
delete
(
String
table
,
String
key
)
{
long
ist
=
_measurements
.
getIntendedtartTimeNs
();
long
st
=
System
.
nanoTime
();
Status
res
=
_db
.
delete
(
table
,
key
);
long
en
=
System
.
nanoTime
();
measure
(
"DELETE"
,
ist
,
st
,
en
);
_measurements
.
reportStatus
(
"DELETE"
,
res
);
return
res
;
}
}
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