ContextHubService: Keep handles across hub reboot

    return 0;

}

static void query_hub_for_apps(uint64_t appId, uint32_t hubHandle) {

static void query_hub_for_apps(uint32_t hubHandle) {

    hub_message_t msg;

    query_apps_request_t queryMsg;

    queryMsg.app_name.id = appId;

    // TODO(b/30835598): When we're able to tell which request our

    //     response matches, then we should allow this to be more

    //     targetted, instead of always being every app in the

    //     system.

    queryMsg.app_name.id = ALL_APPS;

    msg.message_type = CONTEXT_HUB_QUERY_APPS;

    msg.message_len  = sizeof(queryMsg);

    }

}

static void sendQueryForApps(uint64_t appId) {

static void sendQueryForApps() {

    for (int i = 0; i < db.hubInfo.numHubs; i++ ) {

        query_hub_for_apps(appId, i);

        query_hub_for_apps(i);

    }

}

static jint add_app_instance(const hub_app_info *appInfo, uint32_t hubHandle,

        jint appInstanceHandle, JNIEnv *env) {

    ALOGI("Loading App");

    // Not checking if the apps are indeed distinct

    app_instance_info_s entry;

    assert(appInfo);

    db.appInstances[appInstanceHandle] = entry;

    // Finally - let the service know of this app instance

    // Finally - let the service know of this app instance, to populate

    // the Java cache.

    env->CallIntMethod(db.jniInfo.jContextHubService,

                       db.jniInfo.contextHubServiceAddAppInstance,

                       hubHandle, entry.instanceId, entry.truncName,

                       entry.appInfo.version);

    ALOGW("%s App 0x%" PRIx64 " on hub Handle %" PRId32

    ALOGI("%s App 0x%" PRIx64 " on hub Handle %" PRId32

          " as appInstance %" PRId32, action, entry.truncName,

          entry.hubHandle, appInstanceHandle);

            }

        }

        sendQueryForApps(ALL_APPS);

        sendQueryForApps();

    } else {

        ALOGW("No Context Hub Module present");

    }

    }

    int numApps = msgLen / sizeof(hub_app_info);

    hub_app_info info;

    const hub_app_info *unalignedInfoAddr = (const hub_app_info*)msg;

    for (int i = 0; i < numApps; i++, unalignedInfoAddr++) {

        memcpy(&info, unalignedInfoAddr, sizeof(info));

    // We use this information to sync our JNI and Java caches of nanoapp info.

    // We want to accomplish two things here:

    // 1) Remove entries from our caches which are stale, and pertained to

    //    apps no longer running on Context Hub.

    // 2) Populate our caches with the latest information of all these apps.

    // We make a couple of assumptions here:

    // A) The JNI and Java caches are in sync with each other (this isn't

    //    necessarily true; any failure of a single call into Java land to

    //    update its cache will leave that cache in a bad state.  For NYC,

    //    we're willing to tolerate this for now).

    // B) The total number of apps is relatively small, so horribly inefficent

    //    algorithms aren't too painful.

    // C) We're going to call this relatively infrequently, so its inefficency

    //    isn't a big impact.

    // (1).  Looking for stale cache entries.  Yes, this is O(N^2).  See

    // assumption (B).  Per assumption (A), it is sufficient to iterate

    // over just the JNI cache.

    auto end = db.appInstances.end();

    for (auto current = db.appInstances.begin(); current != end; ) {

        app_instance_info_s cache_entry = current->second;

        // We perform our iteration here because if we call

        // delete_app_instance() below, it will erase() this entry.

        current++;

        bool entryIsStale = true;

        for (int i = 0; i < numApps; i++) {

            // We use memcmp since this could be unaligned.

            if (memcmp(&unalignedInfoAddr[i].app_name.id,

                       &cache_entry.appInfo.app_name.id,

                       sizeof(cache_entry.appInfo.app_name.id)) == 0) {

                // We found a match; this entry is current.

                entryIsStale = false;

                break;

            }

        }

        if (entryIsStale) {

            delete_app_instance(cache_entry.instanceId, env);

        }

    }

    // (2).  Update our caches with the latest.

    for (int i = 0; i < numApps; i++) {

        hub_app_info query_info;

        memcpy(&query_info, &unalignedInfoAddr[i], sizeof(query_info));

        // We will only have one instance of the app

        // TODO : Change this logic once we support multiple instances of the same app

        jint appInstance = get_app_instance_for_app_id(info.app_name.id);

        add_app_instance(&info, hubHandle, appInstance, env);

        jint appInstance = get_app_instance_for_app_id(query_info.app_name.id);

        if (appInstance == -1) {

            // This is a previously unknown app, let's allocate an "id" for it.

            appInstance = generate_id();

        }

        add_app_instance(&query_info, hubHandle, appInstance, env);

    }

    return 0;

            ALOGW("Could not attach to JVM !");

            success = false;

        }

        sendQueryForApps(info->appInfo.app_name.id);

        // While we just called add_app_instance above, our info->appInfo was

        // incomplete (for example, the 'version' is hardcoded to -1).  So we

        // trigger an additional query to the CHRE, so we'll be able to get

        // all the app "info", and have our JNI and Java caches with the

        // full information.

        sendQueryForApps();

    } else {

        ALOGW("Could not load the app successfully ! Unexpected failure");

        *appInstanceHandle = INVALID_APP_ID;

    return true;

}

static void invalidateNanoApps(uint32_t hubHandle) {

    JNIEnv *env;

    if ((db.jniInfo.vm)->AttachCurrentThread(&env, nullptr) != JNI_OK) {

        ALOGW("Could not attach to JVM !");

        env = nullptr;

    }

    auto end = db.appInstances.end();

    for (auto current = db.appInstances.begin(); current != end; ) {

        app_instance_info_s info = current->second;

        current++;

        if (info.hubHandle == hubHandle) {

             delete_app_instance(info.instanceId, env);

        }

    }

}

static int handle_os_message(uint32_t msgType, uint32_t hubHandle,

                             const uint8_t *msg, int msgLen) {

    int retVal = -1;

              ALOGW("Context Hub handle %d restarted", hubHandle);

              closeTxn();

              passOnOsResponse(hubHandle, msgType, &rsp, nullptr, 0);

              invalidateNanoApps(hubHandle);

              query_hub_for_apps(ALL_APPS, hubHandle);

              query_hub_for_apps(hubHandle);

              retVal = 0;

          }

          break;