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体验新版 GitCode,发现更多精彩内容 >>
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54c5df2c
编写于
4月 22, 2014
作者:
K
Kohsuke Kawaguchi
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差异文件
trying to come up with a better representation. Not sure if I'm succeeding
上级
d8af9b36
变更
1
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1 changed file
with
42 addition
and
35 deletion
+42
-35
core/src/main/java/jenkins/util/AtmostOneTaskExecutor.java
core/src/main/java/jenkins/util/AtmostOneTaskExecutor.java
+42
-35
未找到文件。
core/src/main/java/jenkins/util/AtmostOneTaskExecutor.java
浏览文件 @
54c5df2c
...
...
@@ -24,6 +24,17 @@ import java.util.concurrent.Future;
* submits the same task. Thus {@link #submit()} method does not take {@link Callable} as a parameter,
* instead you pass that in the constructor.
*
*
* <h2>Implementation</h2>
* <p>
* This instance has two independent states. One is {@link #pending}, which indicates that
* the task execution is requested but not yet scheduled. The other is {@link #inprogress},
* which indicates that the task execution is scheduled but not yet completed.
*
* <p>
* All the internal state transition is guarded by the monitor of 'this'. {@link #pending}
* is non-null only if {@link #inprogress} is non-null.
*
* @author Kohsuke Kawaguchi
* @see AtmostOneThreadExecutor
*/
...
...
@@ -56,47 +67,43 @@ public class AtmostOneTaskExecutor<V> {
}
public
synchronized
Future
<
V
>
submit
()
{
if
(
pending
!=
null
)
// if a task is already pending, just join that
return
pending
;
pending
=
SettableFuture
.
create
();
if
(
inprogress
==
null
)
{
// if the task isn't currently running, schedule one
run
();
if
(
pending
==
null
)
{
pending
=
SettableFuture
.
create
();
maybeRun
();
}
return
pending
;
}
private
synchronized
void
run
()
{
// the only situation where we can submit the task for execution
assert
inprogress
==
null
;
assert
pending
!=
null
;
base
.
submit
(
new
Callable
<
Void
>()
{
@Override
public
Void
call
()
throws
Exception
{
// before we get going, everyone who submits after this
// should form a next batch
synchronized
(
AtmostOneTaskExecutor
.
this
)
{
inprogress
=
pending
;
pending
=
null
;
}
try
{
inprogress
.
set
(
task
.
call
());
}
catch
(
Throwable
t
)
{
inprogress
.
setException
(
t
);
}
finally
{
/**
* If {@link #pending} is non-null (meaning someone requested the task to be kicked),
* but {@link #inprogress} is null (meaning none is executing right now),
* get one going.
*/
private
synchronized
void
maybeRun
()
{
if
(
inprogress
==
null
&&
pending
!=
null
)
{
base
.
submit
(
new
Callable
<
Void
>()
{
@Override
public
Void
call
()
throws
Exception
{
synchronized
(
AtmostOneTaskExecutor
.
this
)
{
// if next one is pending, get that scheduled
inprogress
=
null
;
if
(
pending
!=
null
)
run
();
// everyone who submits after this should form a next batch
inprogress
=
pending
;
pending
=
null
;
}
try
{
inprogress
.
set
(
task
.
call
());
}
catch
(
Throwable
t
)
{
inprogress
.
setException
(
t
);
}
finally
{
synchronized
(
AtmostOneTaskExecutor
.
this
)
{
// if next one is pending, get that scheduled
inprogress
=
null
;
maybeRun
();
}
}
return
null
;
}
return
null
;
}
});
});
}
}
}
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