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体验新版 GitCode,发现更多精彩内容 >>
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50422801
编写于
6月 30, 2014
作者:
F
Fabian Hueske
浏览文件
操作
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电子邮件补丁
差异文件
Minor changes in Java POJO WordCount example
上级
0902829e
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
35 addition
and
44 deletion
+35
-44
stratosphere-examples/stratosphere-java-examples/src/main/java/eu/stratosphere/example/java/wordcount/WordCountPOJO.java
...eu/stratosphere/example/java/wordcount/WordCountPOJO.java
+35
-44
未找到文件。
stratosphere-examples/stratosphere-java-examples/src/main/java/eu/stratosphere/example/java/wordcount/WordCountPOJO.java
浏览文件 @
50422801
...
...
@@ -18,7 +18,6 @@ import eu.stratosphere.api.java.DataSet;
import
eu.stratosphere.api.java.ExecutionEnvironment
;
import
eu.stratosphere.api.java.functions.FlatMapFunction
;
import
eu.stratosphere.api.java.functions.ReduceFunction
;
import
eu.stratosphere.api.java.tuple.Tuple2
;
import
eu.stratosphere.example.java.wordcount.util.WordCountData
;
import
eu.stratosphere.util.Collector
;
...
...
@@ -49,24 +48,6 @@ public class WordCountPOJO {
// PROGRAM
// *************************************************************************
public
static
class
WC
{
public
String
word
;
public
int
count
;
public
WC
()
{
}
public
WC
(
String
word
,
int
count
)
{
this
.
word
=
word
;
this
.
count
=
count
;
}
@Override
public
String
toString
()
{
return
word
+
" "
+
count
;
}
}
public
static
void
main
(
String
[]
args
)
throws
Exception
{
parseParameters
(
args
);
...
...
@@ -76,26 +57,14 @@ public class WordCountPOJO {
// get input data
DataSet
<
String
>
text
=
getTextDataSet
(
env
);
DataSet
<
WC
>
tokenized
=
text
.
flatMap
(
new
FlatMapFunction
<
String
,
WC
>()
{
@Override
public
void
flatMap
(
String
value
,
Collector
<
WC
>
out
)
{
String
[]
tokens
=
value
.
toLowerCase
().
split
(
"\\W+"
);
for
(
String
token
:
tokens
)
{
if
(
token
.
length
()
>
0
)
{
out
.
collect
(
new
WC
(
token
,
1
));
}
}
}
});
DataSet
<
WC
>
counts
=
tokenized
.
groupBy
(
"word"
)
.
reduce
(
new
ReduceFunction
<
WC
>()
{
public
WC
reduce
(
WC
value1
,
WC
value2
)
{
return
new
WC
(
value1
.
word
,
value1
.
count
+
value2
.
count
);
}
});
DataSet
<
WC
>
counts
=
text
.
flatMap
(
new
Tokenizer
())
.
groupBy
(
"word"
)
.
reduce
(
new
ReduceFunction
<
WC
>()
{
public
WC
reduce
(
WC
value1
,
WC
value2
)
{
return
new
WC
(
value1
.
word
,
value1
.
count
+
value2
.
count
);
}
});
// emit result
if
(
fileOutput
)
{
...
...
@@ -104,9 +73,31 @@ public class WordCountPOJO {
counts
.
print
();
}
env
.
execute
(
"WordCount with custom data types
E
xample"
);
env
.
execute
(
"WordCount with custom data types
e
xample"
);
}
// *************************************************************************
// USER DATA TYPES (POJOs)
// *************************************************************************
public
static
class
WC
{
public
String
word
;
public
int
count
;
public
WC
()
{
}
public
WC
(
String
word
,
int
count
)
{
this
.
word
=
word
;
this
.
count
=
count
;
}
@Override
public
String
toString
()
{
return
word
+
" "
+
count
;
}
}
// *************************************************************************
// USER FUNCTIONS
// *************************************************************************
...
...
@@ -114,19 +105,19 @@ public class WordCountPOJO {
/**
* Implements the string tokenizer that splits sentences into words as a user-defined
* FlatMapFunction. The function takes a line (String) and splits it into
* multiple
pairs in the form of "(word,1)" (Tuple2<String, Integer>)
.
* multiple
WC POJOs as "(word, 1)"
.
*/
public
static
final
class
Tokenizer
extends
FlatMapFunction
<
String
,
Tuple2
<
String
,
Integer
>
>
{
public
static
final
class
Tokenizer
extends
FlatMapFunction
<
String
,
WC
>
{
@Override
public
void
flatMap
(
String
value
,
Collector
<
Tuple2
<
String
,
Integer
>
>
out
)
{
public
void
flatMap
(
String
value
,
Collector
<
WC
>
out
)
{
// normalize and split the line
String
[]
tokens
=
value
.
toLowerCase
().
split
(
"\\W+"
);
// emit the pairs
for
(
String
token
:
tokens
)
{
if
(
token
.
length
()
>
0
)
{
out
.
collect
(
new
Tuple2
<
String
,
Integer
>
(
token
,
1
));
out
.
collect
(
new
WC
(
token
,
1
));
}
}
}
...
...
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