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From "Pepijn Noltes (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CELIX-441) Add service tracker api to bundle context
Date Tue, 10 Apr 2018 18:46:00 GMT

     [ https://issues.apache.org/jira/browse/CELIX-441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pepijn Noltes updated CELIX-441:
--------------------------------
    Attachment: bundle_context_additions.h

> Add service tracker api to bundle context
> -----------------------------------------
>
>                 Key: CELIX-441
>                 URL: https://issues.apache.org/jira/browse/CELIX-441
>             Project: Celix
>          Issue Type: Improvement
>          Components: Framework
>    Affects Versions: 2.3.0
>            Reporter: Pepijn Noltes
>            Priority: Major
>         Attachments: bundle_context_additions.h
>
>
> To make the use of service trackers easier integrate a service tracker API directly on
the bundle context.
> The service tracker should be stored in the bundle context and automatically be closed
and destroy when the bundle is respectively stopped / destroyed. 
> Proposed API:
> /**
>  * track service for the provided serviceName and/or filter.
>  * The highest ranking services will used for the callback.
>  * If a new and higher ranking services the callback with be called again with the new
service.
>  * If a service is removed a the callback with be called with next highest ranking service
or NULL as service.
>  *
>  * @param ctx The bundle context.
>  * @param serviceName Optional the service name to track
>  * @param serviceVersionRange Optional the service version range to track
>  * @param filter Optional the LDAP filter to use
>  * @param data The data pointer, which will be used in the callbacks
>  * @param setting The callback, which will be called when a new highest ranking service
is set.
>  * @return the tracker uuid or null uuid (uuid_is_null) if unsuccessful.
>  */
> uuid_t bundleContext_trackService(
>         bundle_context_t* mod,
>         const char* serviceName,
>         const char* serviceVersionRange,
>         const char* filter,
>         void* data,
>         int (*setting)(void* data, void* svc)
> );
> /**
>  * track services for the provided serviceName and/or filter.
>  *
>  * @param ctx The bundle context.
>  * @param serviceName Optional the service name to track
>  * @param serviceVersionRange Optional the service version range to track
>  * @param filter Optional the LDAP filter to use
>  * @param data The data pointer, which will be used in the callbacks
>  * @param adding The callback, which will be called when service is added.
>  * @param removing The callback, which will be called when a service is removed
>  * @return the tracker uuid or null uuid (uuid_is_null) if unsuccessful.
>  */
> uuid_t bundleContext_trackServices(
>         bundle_context_t* ctx,
>         const char* serviceName,
>         const char* serviceVersionRange,
>         const char* filter,
>         void* data,
>         int (*adding)(void* data, void* svc),
>         int (*removing)(void* data, void* svc)
> );
> typedef struct celix_service_tracker_options {
>     //service filter options
>     const char* serviceName;
>     const char* serviceVersionRange;
>     const char* filter;
>     const char* lang; //NULL -> 'CELIX_LANG_C'
>     //callback options
>     void* callbackHandle;
>     int (*onSettingFp)(void *handle, void *svc); //highest ranking
>     int (*onAddingFp)(void *handle, void *svc);
>     int (*onRemovingFp)(void *handle, void *svc);
>     int (*onSettingWithProperties)(void *handle, properties_t *props, void *svc); //highest
ranking
>     int (*onAddingWithProperties)(void *handle, properties_t *props, void *svc);
>     int (*onRemovingWithProperties)(void *handle, properties_t *props, void *svc);
>     int (*onSettingWithOwner)(void *handle, bundle_t *owner, properties_t *props, void
*svc); //highest ranking
>     int (*onAddingWithOwner)(void *handle, bundle_t *owner, properties_t *props, void
*svc);
>     int (*onRemovingWithOwner)(void *handle, bundle_t *owner, properties_t *props, void
*svc);
> } celix_service_tracker_options;
> /**
>  * Tracks services using the provided tracker options.
>  * The tracker options are only using during this call and can safely be freed/reused
after this call returns.
>  *
>  * @param ctx The module context.
>  * @param opts The pointer to the tracker options.
>  * @return the tracker uuid or null uuid (uuid_is_null) if unsuccessful.
>  */
> uint64_t bundleContext_trackServicesWithOptions(bundle_context_t *ctx, const celix_service_tracker_options
*opts);
> //shortcut could be const celix_service_tracker_options opts = {0};
> /**
>  * Stop the tracker with the provided track id.
>  * Only works for the trackers owned by the bundle of the bundle context.
>  *
>  * @return CELIX_SUCCESS if the tracker is stopped correctly.
>  */
> int bundleContext_stopTracking(bundle_context_t *ctx, uuid_t trackerId);



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