本文整理汇总了TypeScript中rxjs/operators.throwIfEmpty函数的典型用法代码示例。如果您正苦于以下问题：TypeScript throwIfEmpty函数的具体用法？TypeScript throwIfEmpty怎么用？TypeScript throwIfEmpty使用的例子？那么, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了throwIfEmpty函数的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: asDiagram
asDiagram('throwIfEmpty')('should error when empty', () => {
const source = cold('----|');
const expected = '----#';
expectObservable(
source.pipe(throwIfEmpty(() => new Error('test')))
).toBe(expected, undefined, new Error('test'));
});示例2: it
it('should error when empty', () => {
const source = cold('----|');
const sub1 = '^ !';
const expected = '----#';
expectObservable(
source.pipe(throwIfEmpty(() => new Error('test')))
).toBe(expected, undefined, new Error('test'));
expectSubscriptions(source.subscriptions).toBe([sub1]);
});示例3: runBenchmark
export function runBenchmark({
command, captures, reporters = [], iterations = 5, retries = 5, logger = new logging.NullLogger(),
}: RunBenchmarkOptions): Observable<MetricGroup[]> {
let successfulRuns = 0;
let failedRuns = 0;
const notDoneYet = new BaseException('Not done yet.');
const processFailed = new BaseException('Wrong exit code.');
const debugPrefix = () => `Run #${successfulRuns + 1}:`;
let aggregatedMetricGroups: MetricGroup[] = [];
// Run the process and captures, wait for both to finish, and average out the metrics.
return new Observable(obs => {
const monitoredProcess = new LocalMonitoredProcess(command);
const metric$ = captures.map(capture => capture(monitoredProcess));
obs.next([monitoredProcess, ...metric$]);
}).pipe(
tap(() => logger.debug(`${debugPrefix()} starting`)),
concatMap(([monitoredProcess, ...metric$]) => forkJoin(monitoredProcess.run(), ...metric$)),
throwIfEmpty(() => new Error('Nothing was captured')),
concatMap((results) => {
const [processExitCode, ...metrics] = results;
if ((processExitCode as number) != command.expectedExitCode) {
logger.debug(`${debugPrefix()} exited with ${processExitCode} but `
+ `${command.expectedExitCode} was expected`);
return throwError(processFailed);
}
logger.debug(`${debugPrefix()} finished successfully`);
return of(metrics as MetricGroup[]);
}),
map(newMetricGroups => {
// Aggregate metric groups into a single one.
if (aggregatedMetricGroups.length === 0) {
aggregatedMetricGroups = newMetricGroups;
} else {
aggregatedMetricGroups = aggregatedMetricGroups.map((_, idx) =>
aggregateMetricGroups(aggregatedMetricGroups[idx], newMetricGroups[idx]),
);
}
successfulRuns += 1;
return aggregatedMetricGroups;
}),
concatMap(val => successfulRuns < iterations ? throwError(notDoneYet) : of(val)),
// This is where we control when the process should be run again.
retryWhen(errors => errors.pipe(concatMap(val => {
// Always run again while we are not done yet.
if (val === notDoneYet) { return of(val); }
// Otherwise check if we're still within the retry threshold.
failedRuns += 1;
if (failedRuns < retries) { return of(val); }
if (val === processFailed) { return throwError(new MaximumRetriesExceeded(retries)); }
// Not really sure what happened here, just re-throw it.
return throwError(val);
}))),
tap(groups => reporters.forEach(reporter => reporter(command, groups))),
take(1),
);
}