Update examples for Quartz scheduling to use SimpleTriggerFactoryBean
and CronTriggerFactoryBean instead of SimpleTriggerBean and
CronTriggerBean.
Issue: SPR-10209
Convert all docbook XML files to well-formed docbook 5 syntax:
- Include xsi:schemaLocation element for tools support
- Convert all id elements to xml:id
- Convert all ulink elements to link
- Simplify <lineannotation> mark-up
- Fix misplaced </section> tags
- Fix <interface> tags to <interfacename>
- Cleanup trailing whitespace and tabs
Issue: SPR-10032
Update reference manual with details of Java configuration @Enable*
annotations. Examples of Java style @Configuration is provided
when appropriate alongside existing XML samples.
Several existing @Configuration samples have been changed to placing
the @Enable annotation below the @Configuration annotation.
This has been done to provide consistency with existing Javadoc.
Issue: SPR-9920
java.util.concurrent's ScheduledExecutorService and its #schedule*
methods allow for an 'initialDelay' parameter in milliseconds.
Similarly, Spring's TaskExecutor abstraction allows for a concrete
'startTime' expressed as a Date. However, Spring's <task:scheduled> XML
element and @Scheduled annotation have, to date, not allowed for an
initial delay parameter that can be propagated down to the underlying
TaskScheduler/ScheduledExecutorService.
This commit introduces initial-delay and #initialDelay attributes to
task:scheduled and @Scheduled respectively, both indicating the number
of milliseconds to wait before the first invocation of the method in
question. Specifying a delay in this fashion is only valid in
conjunction with fixed-rate and fixed-delay tasks (i.e. not with cron
or trigger tasks).
The principal changes required to support these new attributes lie in
ScheduledTaskRegistrar, which previously supported registration of
tasks in the form of a Runnable and a Long parameter indicating (in the
case of fixed-rate and fixed-delay tasks), the interval with which the
task should be executed. In order to accommodate a third (and optional)
'initialDelay' parameter, the IntervalTask class has been added as a
holder for the Runnable to be executed, the interval in which to run
it, and the optional initial delay. For symmetry, a TriggerTask and
CronTask have also been added, the latter subclassing the former. And a
'Task' class has been added as a common ancestor for all the above.
One oddity of the implementation is in the naming of the new
setters in ScheduledTaskRegistrar. Prior to this commit, the setters
were named #setFixedDelayTasks, #setFixedRateTasks, etc, each accepting
a Map<Runnable, long>. In adding new setters for each task type, each
accepting a List<IntervalTask>, List<CronTask> etc, naturally the
approach would be to use method overloading and to introduce methods
of the same name but with differing parameter types. Unfortunately
however, Spring does not support injection against overloaded methods
(due to fundamental limitations of the underlying JDK Introspector).
This is not a problem when working with the ScheduledTaskRegistrar
directly, e.g. from within a @Configuration class that implements
SchedulingConfigurer, but is a problem from the point of view of the
ScheduledTasksBeanDefinitionParser which parses the <task:scheduled>
element - here the ScheduledTaskRegistrar is treated as a Spring bean
and is thus subject to these limitations. The solution to this problem
was simply to avoid overloading altogether, thus the naming of the new
methods ending in "List", e.g. #setFixedDelayTasksList, etc. These
methods exist primarily for use by the BeanDefinitionParser and are
not really intended for use by application developers. The Javadoc for
each of the new methods makes note of this.
Issue: SPR-7022
In anticipation of substantive changes required to implement "initial
delay" support in the <task:scheduled> element and @Scheduled
annotation, the following updates have been made to the components and
infrastructure supporting scheduled task execution:
- Fix code style violations
- Fix compiler warnings
- Add Javadoc where missing, update to use {@code} tags, etc.
- Organize imports to follow conventions
Prior to this change, Spring's @Async annotation support was tied to a
single AsyncTaskExecutor bean, meaning that all methods marked with
@Async were forced to use the same executor. This is an undesirable
limitation, given that certain methods may have different priorities,
etc. This leads to the need to (optionally) qualify which executor
should handle each method.
This is similar to the way that Spring's @Transactional annotation was
originally tied to a single PlatformTransactionManager, but in Spring
3.0 was enhanced to allow for a qualifier via the #value attribute, e.g.
@Transactional("ptm1")
public void m() { ... }
where "ptm1" is either the name of a PlatformTransactionManager bean or
a qualifier value associated with a PlatformTransactionManager bean,
e.g. via the <qualifier> element in XML or the @Qualifier annotation.
This commit introduces the same approach to @Async and its relationship
to underlying executor beans. As always, the following syntax remains
supported
@Async
public void m() { ... }
indicating that calls to #m will be delegated to the "default" executor,
i.e. the executor provided to
<task:annotation-driven executor="..."/>
or the executor specified when authoring a @Configuration class that
implements AsyncConfigurer and its #getAsyncExecutor method.
However, it now also possible to qualify which executor should be used
on a method-by-method basis, e.g.
@Async("e1")
public void m() { ... }
indicating that calls to #m will be delegated to the executor bean
named or otherwise qualified as "e1". Unlike the default executor
which is specified up front at configuration time as described above,
the "e1" executor bean is looked up within the container on the first
execution of #m and then cached in association with that method for the
lifetime of the container.
Class-level use of Async#value behaves as expected, indicating that all
methods within the annotated class should be executed with the named
executor. In the case of both method- and class-level annotations, any
method-level #value overrides any class level #value.
This commit introduces the following major changes:
- Add @Async#value attribute for executor qualification
- Introduce AsyncExecutionAspectSupport as a common base class for
both MethodInterceptor- and AspectJ-based async aspects. This base
class provides common structure for specifying the default executor
(#setExecutor) as well as logic for determining (and caching) which
executor should execute a given method (#determineAsyncExecutor) and
an abstract method to allow subclasses to provide specific strategies
for executor qualification (#getExecutorQualifier).
- Introduce AnnotationAsyncExecutionInterceptor as a specialization of
the existing AsyncExecutionInterceptor to allow for introspection of
the @Async annotation and its #value attribute for a given method.
Note that this new subclass was necessary for packaging reasons -
the original AsyncExecutionInterceptor lives in
org.springframework.aop and therefore does not have visibility to
the @Async annotation in org.springframework.scheduling.annotation.
This new subclass replaces usage of AsyncExecutionInterceptor
throughout the framework, though the latter remains usable and
undeprecated for compatibility with any existing third-party
extensions.
- Add documentation to spring-task-3.2.xsd and reference manual
explaining @Async executor qualification
- Add tests covering all new functionality
Note that the public API of all affected components remains backward-
compatible.
Issue: SPR-6847
This is the first merge from 3.1.x => master after the Gradle build
system migration. Notice how files changed under the 3.1.x directory
structure (org.springframework.*) merge seamlessly into the new
directory structure (spring-*).
Certain files had changed under 3.1.x that have since been deleted with
the Gradle build migration, e.g. all pom.xml files had <license>
sections added. These files showed up as a conflict during the merge,
but the resolution is to simply re-remove them and commit as they are
no longer relevant under 3.2.x / master.
Also noteworthy is the .gitignore file. It has been updated under 3.1.x
to ignore files and directories specific to the new Gradle-based
structure. However, this causes conflicts when trying to merge against
master, given that master should *not* ignore this directories. The
resolution in this situation is to simply force the 'master' version of
the file, i.e. when prompted for merge resolution:
anakata:~/Work/spring-framework/spring-framework[master|MERGING]
$ git status -sb
## master...springsource/master [ahead 24]
UU .gitignore
anakata:~/Work/spring-framework/spring-framework[master|MERGING]
$ git checkout master .gitignore
anakata:~/Work/spring-framework/spring-framework[master|MERGING]
$ git commit
It is helpful in situations like this one to enable git's "rerere"
feature beforehand, which records and remembers resolution strategies,
avoiding the need to repeat them in future merges:
$ git config --global rerere.enabled 1
See:
http://progit.org/2010/03/08/rerere.htmlhttp://gitfu.wordpress.com/2008/04/20/git-rerere-rereremember-what-you-did-last-time
Conflicts:
.gitignore
.springframework.*/pom.xml
Problems
- Eliminate — in favor of —
— was causing 'no such entity' errors during docbook
processing; — produces the equivalent output.
- Fix column issues in appendices
column counts were set to 3, when they are in fact 4. This passed
under DocBook 4 and Spring Build for unknown reasons, but caused a
hard stop under DocBook 5 and the docbook-reference-plugin.
- Add jdbc callout section in docbook 5-friendly style
use <co/> tags as advertised in DocBook documentation.
- Set correct widths for PDF ref doc images
images were rendering larger than the PDF page; just set all to
width=400 and everything looks good.
Polish
- Update reference doc copyright to 2012
- Remove "work-in-progress" language from ref docs
- Update maven URLs to repo.springsource.org
- Update javadoc urls from 3.0.x/javadoc-api => current/api
- Replace hardcoded "3.1" with ${version} in ref doc
This change eliminates the spring-framework-reference subproject, moving
these sources into the root project's own src directory.
This makes sense because the reference docs span all submodules, and
also because api Javadoc is created at the root project level as well.
This means that both api and reference documentation output will now
reside in the root project's 'build' directory. This is more consistent
and easy to discover.
