Example usage for com.google.common.net HttpHeaders CACHE

Introduction

In this page you can find the example usage for com.google.common.net HttpHeaders CACHE_CONTROL.

Prototype

String CACHE_CONTROL

To view the source code for com.google.common.net HttpHeaders CACHE_CONTROL.

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Document

The HTTP Cache-Control header field name.

Usage

From source file:org.haiku.haikudepotserver.pkg.controller.PkgIconController.java

/**
 * @param isAsFallback is true if the request was originally for a package, but fell back to this generic.
 *//* w  w  w .  j a  v a2 s  .com*/

private void handleGenericHeadOrGet(RequestMethod requestMethod, HttpServletResponse response, Integer size,
        boolean isAsFallback) throws IOException {

    if (null == size) {
        size = 64; // largest natural size
    }

    size = normalizeSize(size);
    byte[] data = renderedPkgIconRepository.renderGeneric(size);
    response.setHeader(HttpHeaders.CONTENT_LENGTH, Integer.toString(data.length));
    response.setContentType(MediaType.PNG.toString());

    if (isAsFallback) {
        response.setHeader(HttpHeaders.CACHE_CONTROL, "no-cache, no-store, must-revalidate");
        response.setHeader(HttpHeaders.PRAGMA, "no-cache");
        response.setHeader(HttpHeaders.EXPIRES, "0");
    } else {
        response.setDateHeader(HttpHeaders.LAST_MODIFIED, startupMillis);
    }

    if (requestMethod == RequestMethod.GET) {
        response.getOutputStream().write(data);
    }
}

From source file:org.haiku.haikudepotserver.job.controller.JobController.java

/**
 * <p>This URL can be used to download job data that has resulted from a job being run.</p>
 *///from w w w  .  j  a  v a2  s.c o  m

@RequestMapping(value = "/" + SEGMENT_JOBDATA + "/{" + KEY_GUID + "}/"
        + SEGMENT_DOWNLOAD, method = RequestMethod.GET)
public void downloadGeneratedData(HttpServletRequest request, HttpServletResponse response,
        @PathVariable(value = KEY_GUID) String guid) throws IOException {

    Preconditions.checkArgument(PATTERN_GUID.matcher(guid).matches(),
            "the supplied guid does not match the required pattern");

    ObjectContext context = serverRuntime.newContext();

    JobSnapshot job = jobService.tryGetJobForData(guid).orElseThrow(() -> {
        LOGGER.warn("attempt to access job data {} for which no job exists", guid);
        return new JobDataAuthorizationFailure();
    });

    // If there is no user who is assigned to the job then the job is for nobody in particular and is thereby
    // secured by the GUID of the job's data; if you know the GUID then you can have the data.

    if (!Strings.isNullOrEmpty(job.getOwnerUserNickname())) {

        User user = tryObtainAuthenticatedUser(context).orElseThrow(() -> {
            LOGGER.warn("attempt to obtain job data {} with no authenticated user", guid);
            return new JobDataAuthorizationFailure();
        });

        User ownerUser = User.tryGetByNickname(context, job.getOwnerUserNickname()).orElseThrow(() -> {
            LOGGER.warn("owner of job does not seem to exist; {}", job.getOwnerUserNickname());
            return new JobDataAuthorizationFailure();
        });

        if (!authorizationService.check(context, user, ownerUser, Permission.USER_VIEWJOBS)) {
            LOGGER.warn("attempt to access jobs view for; {}", job.toString());
            throw new JobDataAuthorizationFailure();
        }
    } else {
        LOGGER.debug("access to job [{}] allowed for unauthenticated access", job.toString());
    }

    JobDataWithByteSource jobDataWithByteSink = jobService.tryObtainData(guid).orElseThrow(() -> {
        LOGGER.warn("requested job data {} not found", guid);
        return new JobDataAuthorizationFailure();
    });

    // finally access has been checked and the logic can move onto actual
    // delivery of the material.

    JobData jobData = jobDataWithByteSink.getJobData();

    if (!Strings.isNullOrEmpty(jobData.getMediaTypeCode())) {
        response.setContentType(jobData.getMediaTypeCode());
    } else {
        response.setContentType(MediaType.OCTET_STREAM.toString());
    }

    response.setContentType(MediaType.CSV_UTF_8.toString());
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION,
            "attachment; filename=" + jobService.deriveDataFilename(guid));
    response.setDateHeader(HttpHeaders.EXPIRES, 0);
    response.setHeader(HttpHeaders.CACHE_CONTROL, "no-cache");

    // now switch to async for the delivery of the data.

    AsyncContext async = request.startAsync();
    async.setTimeout(TIMEOUT_DOWNLOAD_MILLIS);
    ServletOutputStream outputStream = response.getOutputStream();
    outputStream.setWriteListener(new JobDataWriteListener(guid, jobService, async, outputStream));

    LOGGER.info("did start async stream job data; {}", guid);

}

Example usage for com.google.common.net HttpHeaders CACHE_CONTROL

Introduction

Prototype

Document

Usage