[jira] [Created] (CELIX-441) Add service tracker api to bundle context

["Pepijn Noltes (JIRA)" <ji...@apache.org>]

Pepijn Noltes created CELIX-441:
-----------------------------------

             Summary: 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


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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