| Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 1 | 7 feb 2014 (marrs & uiterlix): |
| 2 | |
| 3 | This prototype demonstrates the new concurrency principles that form the basis for the DM: |
| 4 | |
| 5 | * All external events that influence the state of dependencies are recorded and given |
| 6 | to the serial executor of the component. We record whatever data comes in, so when the |
| 7 | actual job is run by the serial executor, we still have access to the original data |
| 8 | without having to access other sources whose state might have changed since. |
| 9 | * The serial executor of a component will execute a job immediately if it is being called |
| 10 | by the thread that is already executing jobs. |
| 11 | * If the serial executor of a component had not yet started a job, it will queue and start |
| 12 | it on the current thread. |
| 13 | * If the serial executor gets invoked from a different thread than the one currently |
| 14 | executing jobs, the job will be put at the end of the queue. As mentioned before, any |
| 15 | data associated with the event will also be recorded so it is available when the job |
| 16 | executes. |
| 17 | * State in the component and dependency can only be modified via the serial executor |
| 18 | thread. This means we don't need explicit synchronization anywhere. |
| 19 | |
| 20 | 20 sept 2014 (pderop): |
| 21 | |
| 22 | * Added support for parallelism: To allow components to be started and handled in parallel, you can |
| 23 | now register in the OSGi service registry a ComponentExecutorFactory service that is used to get |
| 24 | an Executor for the management of all components dependencies/lifecycle callbacks. See javadoc |
| 25 | from the org.apache.felix.dm.ComponentExecutorFactory interface for more informations. |
| 26 | |
| 27 | You can also take a look at the the org.apache.felix.dependencymanager.samples project, which is |
| 28 | registering a ComponentExecutorFactory from org.apache.felix.dependencymanager.samples.tpool |
| 29 | bundle. |
| 30 | |
| 31 | See also the following property in the org.apache.felix.dependencymanager.samples/bnd.bnd |
| 32 | |
| 33 | org.apache.felix.dependencymanager.parallel=\ |
| 34 | '!org.apache.felix.dependencymanager.samples.tpool, *',\ |
| 35 | |
| 36 | Here, all components will be handled by Executors provided by the ComponentExecutorFactory, |
| 37 | except those having a package starting with "org.apache.felix.dependencymanager.samples.tpool" |
| 38 | (because the threadpool is itself defined using the Dependency Manager API). |
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