Java Code Examples for io.reactivex.Single#defer()

The following examples show how to use io.reactivex.Single#defer() . These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source Project: redpipe   File: Server.java    License: Apache License 2.0 6 votes vote down vote up
protected Single<VertxResteasyDeployment> setupResteasy(Class<?>... resourceOrProviderClasses) {
	return Single.defer(() -> {
		// Build the Jax-RS hello world deployment
		VertxResteasyDeployment deployment = new VertxResteasyDeployment();
		deployment.getDefaultContextObjects().put(Vertx.class, AppGlobals.get().getVertx());
		deployment.getDefaultContextObjects().put(AppGlobals.class, AppGlobals.get());

		return doOnPlugins(plugin -> plugin.deployToResteasy(deployment)).toSingle(() -> {
			for(Class<?> klass : resourceOrProviderClasses) {
				if(klass.isAnnotationPresent(Path.class))
					deployment.getActualResourceClasses().add(klass);
				if(klass.isAnnotationPresent(Provider.class))
					deployment.getActualProviderClasses().add(klass);
			}
			try {
				deployment.start();
			}catch(ExceptionInInitializerError err) {
				// rxjava behaves badly on LinkageError
				RedpipeUtil.rethrow(err.getCause());
			}
			return deployment;
		}).doOnError(t -> t.printStackTrace());
	});
}
 
Example 2
@SuppressWarnings("unchecked")
private Single<TxWithoutValue> build() {
    return Single.defer(() -> {
        AtomicReference<Connection> con = new AtomicReference<Connection>();
        // set the atomic reference when transactedConnection emits
        Single<Connection> transactedConnection = b.connection //
                .map(c -> Util.toTransactedConnection(con, c));
        return Call //
                .createWithZeroOutParameters(transactedConnection, b.sql, parameterGroups(), b.params) //
                .materialize() //
                .filter(x -> !x.isOnNext()) //
                .<TxWithoutValue>flatMap(n -> Tx.toTx(n, con.get(), b.db)) //
                .doOnNext(tx -> {
                    if (tx.isComplete()) {
                        ((TxImpl<Object>) tx).connection().commit();
                    }
                }) //
                .lastOrError();
    });
}
 
Example 3
public static Single<Boolean> resetStats() {
    return Single.defer((Callable<SingleSource<Boolean>>) () -> {
        BriteDatabase db = MimiApplication.getInstance().getBriteDatabase();
        BriteDatabase.Transaction transaction = db.newTransaction();

        ContentValues values = new ContentValues();

        values.put(Board.KEY_ACCESS_COUNT, 0);
        values.put(Board.KEY_LAST_ACCESSED, 0);
        values.put(Board.KEY_POST_COUNT, 0);

        int val = 0;
        try {
            val = db.update(Board.TABLE_NAME, SQLiteDatabase.CONFLICT_IGNORE, values, null, null);
            transaction.markSuccessful();
        } catch (Exception e) {
            Log.e(LOG_TAG, "Error putting post options into the database", e);
        } finally {
            transaction.end();
        }

        return Single.just(val > 0);
    });

}
 
Example 4
Source Project: mimi-reader   File: DatabaseUtils.java    License: Apache License 2.0 6 votes vote down vote up
public static <K extends BaseModel> Single<Boolean> updateTable(final K model) {
    return Single.defer(() -> {
        BriteDatabase db = MimiApplication.getInstance().getBriteDatabase();
        BriteDatabase.Transaction transaction = db.newTransaction();
        int val = 0;
        try {
            val = db.update(model.getTableName(), SQLiteDatabase.CONFLICT_REPLACE, model.toContentValues(), model.clause(), model.vals());
            transaction.markSuccessful();
        } catch (Exception e) {
            Log.e(LOG_TAG, "Error putting model " + model.getClass().getSimpleName() + " into the database", e);
        } finally {
            transaction.end();
        }

        return Single.just(val > 0);
    });
}
 
Example 5
@Override
public Object invoke(Object proxy, Method method, @Nullable Object[] args) throws Throwable {

    // 根据 https://zhuanlan.zhihu.com/p/40097338 对 Retrofit 进行的优化

    if (method.getReturnType() == Observable.class) {
        // 如果方法返回值是 Observable 的话,则包一层再返回,
        // 只包一层 defer 由外部去控制耗时方法以及网络请求所处线程,
        // 如此对原项目的影响为 0,且更可控。
        return Observable.defer(() -> {
            // 执行真正的 Retrofit 动态代理的方法
            return (Observable) method.invoke(getRetrofitService(), args);
        });
    } else if (method.getReturnType() == Single.class) {
        // 如果方法返回值是 Single 的话,则包一层再返回。
        return Single.defer(() -> {
            // 执行真正的 Retrofit 动态代理的方法
            return (Single) method.invoke(getRetrofitService(), args);
        });
    }

    // 返回值不是 Observable 或 Single 的话不处理。
    return method.invoke(getRetrofitService(), args);
}
 
Example 6
Source Project: redpipe   File: SQLUtil.java    License: Apache License 2.0 5 votes vote down vote up
public static <T> Single<T> doInConnection(Func1<? super SQLConnection, ? extends Single<T>> func){
	return Single.defer(() -> {
		Single<SQLConnection> connection = getConnection();
		return connection.flatMap(conn -> {
			return func.call(conn).doAfterTerminate(() -> {
				conn.close();
			});
		});
	});
}
 
Example 7
/**
 * Sometimes it happens that the {@link BluetoothGatt} will receive all {@link BluetoothGattService}'s,
 * {@link android.bluetooth.BluetoothGattCharacteristic}'s and {@link android.bluetooth.BluetoothGattDescriptor}
 * but it won't receive the final callback that the service discovery was completed. This is a potential workaround.
 * <p>
 * There is a change in Android 7.0.0_r1 where all data is received at once - in this situation returned services size will be always 0
 * https://android.googlesource.com/platform/frameworks/base/+/android-7.0.0_r1/core/java/android/bluetooth/BluetoothGatt.java#206
 * https://android.googlesource.com/platform/frameworks/base/+/android-6.0.1_r72/core/java/android/bluetooth/BluetoothGatt.java#205
 *
 * @param bluetoothGatt     the BluetoothGatt to use
 * @param rxBleGattCallback the RxBleGattCallback to use
 * @param timeoutScheduler  the Scheduler for timeout to use
 * @return Observable that may emit {@link RxBleDeviceServices} or {@link TimeoutException}
 */
@NonNull
@Override
protected Single<RxBleDeviceServices> timeoutFallbackProcedure(
        final BluetoothGatt bluetoothGatt,
        final RxBleGattCallback rxBleGattCallback,
        final Scheduler timeoutScheduler
) {
    return Single.defer(new Callable<SingleSource<? extends RxBleDeviceServices>>() {
        @Override
        public SingleSource<? extends RxBleDeviceServices> call() {
            final List<BluetoothGattService> services = bluetoothGatt.getServices();
            if (services.size() == 0) {
                // if after the timeout services are empty we have no other option to declare a failed discovery
                return Single.error(new BleGattCallbackTimeoutException(bluetoothGatt, BleGattOperationType.SERVICE_DISCOVERY));
            } else {
            /*
            it is observed that usually the Android OS is returning services, characteristics and descriptors in a short period of time
            if there are some services available we will wait for 5 more seconds just to be sure that
            the timeout was not triggered right in the moment of filling the services and then emit a value.
             */
                return Single
                        .timer(5, TimeUnit.SECONDS, timeoutScheduler)
                        .flatMap(new Function<Long, Single<RxBleDeviceServices>>() {
                            @Override
                            public Single<RxBleDeviceServices> apply(Long delayedSeconds) {
                                return Single.fromCallable(new Callable<RxBleDeviceServices>() {
                                    @Override
                                    public RxBleDeviceServices call() {
                                        return new RxBleDeviceServices(bluetoothGatt.getServices());
                                    }
                                });
                            }
                        });
            }
        }
    });
}
 
Example 8
@Override
public Single<Boolean> canReOpenEvent() {
    return Single.defer(() -> Single.fromCallable(() -> d2.userModule().authorities()
            .byName().in("F_UNCOMPLETE_EVENT", "ALL").one().blockingExists()
    ));
}
 
Example 9
Source Project: immutables   File: ElasticsearchOps.java    License: Apache License 2.0 4 votes vote down vote up
Single<WriteResult> insertBulk(List<ObjectNode> documents) {
  return Single.defer(() -> insertBulkInternal(documents));
}