Example usage for io.vertx.core.http HttpHeaders ETAG

Introduction

In this page you can find the example usage for io.vertx.core.http HttpHeaders ETAG.

Prototype

CharSequence ETAG

To view the source code for io.vertx.core.http HttpHeaders ETAG.

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Document

Etag header name

Usage

From source file:com.github.ithildir.airbot.service.impl.AirNowMeasurementServiceImpl.java

License:Open Source License

@Override
public void init(Handler<AsyncResult<Void>> handler) {
    if (StringUtils.isBlank(_reportingAreaETag)) {
        _initReportingAreaRecords(handler);

        return;//w  ww .j  ava  2s  . c  o  m
    }

    HttpRequest<?> httpRequest = _webClient.head(_REPORTING_AREA_URI);

    httpRequest = httpRequest.as(BodyCodec.none());

    httpRequest.send(asyncResult -> {
        HttpResponse<?> httpResponse = _handleHttpResponse(asyncResult, handler);

        if (httpResponse == null) {
            return;
        }

        String etag = httpResponse.getHeader(HttpHeaders.ETAG.toString());

        if (_reportingAreaETag.equals(etag)) {
            if (_logger.isDebugEnabled()) {
                _logger.debug("AirNow reporting area records are already " + "up-to-date with ETag {0}", etag);
            }

            return;
        }

        _initReportingAreaRecords(handler);
    });
}

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From source file:com.github.ithildir.airbot.service.impl.AirNowMeasurementServiceImpl.java

License:Open Source License

private void _initReportingAreaRecords(Handler<AsyncResult<Void>> handler) {
    HttpRequest<?> httpRequest = _webClient.get(_REPORTING_AREA_URI);

    RecordParser recordParser = RecordParser.newDelimited("\n", this::_initReportingAreaRecord);

    httpRequest = httpRequest.as(BodyCodec.pipe(new RecordParserWriteStream(recordParser)));

    httpRequest.send(asyncResult -> {
        HttpResponse<?> httpResponse = _handleHttpResponse(asyncResult, handler);

        if (httpResponse == null) {
            return;
        }//from   w  ww .j a va2 s .com

        _reportingAreaETag = httpResponse.getHeader(HttpHeaders.ETAG.toString());

        if (_logger.isInfoEnabled()) {
            _logger.info("AirNow reporting area records updated with ETag {0}", _reportingAreaETag);
        }

        handler.handle(Future.succeededFuture());
    });
}

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