Examples with ConfigurationCache org.apache.nifi.minifi.c2.api.cache.ConfigurationCache used on opensource projects

Example 1 with ConfigurationCache

use of org.apache.nifi.minifi.c2.api.cache.ConfigurationCache in project nifi-minifi by apache.

the class NiFiRestConfigurationProvider method getConfiguration.

@Override
public Configuration getConfiguration(String contentType, Integer version, Map<String, List<String>> parameters) throws ConfigurationProviderException {
    if (!CONTENT_TYPE.equals(contentType)) {
        throw new ConfigurationProviderException("Unsupported content type: " + contentType + " supported value is " + CONTENT_TYPE);
    }
    String filename = templateNamePattern;
    for (Map.Entry<String, List<String>> entry : parameters.entrySet()) {
        if (entry.getValue().size() != 1) {
            throw new InvalidParameterException("Multiple values for same parameter not supported in this provider.");
        }
        filename = filename.replaceAll(Pattern.quote("${" + entry.getKey() + "}"), entry.getValue().get(0));
    }
    int index = filename.indexOf("${");
    while (index != -1) {
        int endIndex = filename.indexOf("}", index);
        if (endIndex == -1) {
            break;
        }
        String variable = filename.substring(index + 2, endIndex);
        if (!"version".equals(variable)) {
            throw new InvalidParameterException("Found unsubstituted parameter " + variable);
        }
        index = endIndex + 1;
    }
    String id = null;
    if (version == null) {
        String filenamePattern = Arrays.stream(filename.split(Pattern.quote("${version}"), -1)).map(Pattern::quote).collect(Collectors.joining("([0-9+])"));
        Pair<String, Integer> maxIdAndVersion = getMaxIdAndVersion(filenamePattern);
        id = maxIdAndVersion.getFirst();
        version = maxIdAndVersion.getSecond();
    }
    filename = filename.replaceAll(Pattern.quote("${version}"), Integer.toString(version));
    WriteableConfiguration configuration = configurationCache.getCacheFileInfo(contentType, parameters).getConfiguration(version);
    if (configuration.exists()) {
        if (logger.isDebugEnabled()) {
            logger.debug("Configuration " + configuration + " exists and can be served from configurationCache.");
        }
    } else {
        if (logger.isDebugEnabled()) {
            logger.debug("Configuration " + configuration + " doesn't exist, will need to download and convert template.");
        }
        if (id == null) {
            try {
                String tmpFilename = templateNamePattern;
                for (Map.Entry<String, List<String>> entry : parameters.entrySet()) {
                    if (entry.getValue().size() != 1) {
                        throw new InvalidParameterException("Multiple values for same parameter not supported in this provider.");
                    }
                    tmpFilename = tmpFilename.replaceAll(Pattern.quote("${" + entry.getKey() + "}"), entry.getValue().get(0));
                }
                Pair<Stream<Pair<String, String>>, Closeable> streamCloseablePair = getIdAndFilenameStream();
                try {
                    String finalFilename = filename;
                    id = streamCloseablePair.getFirst().filter(p -> finalFilename.equals(p.getSecond())).map(Pair::getFirst).findFirst().orElseThrow(() -> new InvalidParameterException("Unable to find template named " + finalFilename));
                } finally {
                    streamCloseablePair.getSecond().close();
                }
            } catch (IOException | TemplatesIteratorException e) {
                throw new ConfigurationProviderException("Unable to retrieve template list", e);
            }
        }
        HttpURLConnection urlConnection = httpConnector.get("/templates/" + id + "/download");
        try (InputStream inputStream = urlConnection.getInputStream()) {
            ConfigSchema configSchema = ConfigMain.transformTemplateToSchema(inputStream);
            SchemaSaver.saveConfigSchema(configSchema, configuration.getOutputStream());
        } catch (IOException e) {
            throw new ConfigurationProviderException("Unable to download template from url " + urlConnection.getURL(), e);
        } catch (JAXBException e) {
            throw new ConfigurationProviderException("Unable to convert template to yaml", e);
        } finally {
            urlConnection.disconnect();
        }
    }
    return configuration;
}