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Java SDK for ConfigCat, a feature flag, feature toggle, and configuration management service. That lets you launch new features and change your software configuration remotely without actually (re)deploying code. ConfigCat even helps you do controlled roll-outs like canary releases and blue-green deployments.

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package com.configcat;

public class Entry {
    private final Config config;
    private final String eTag;
    private final String cacheString;
    private final long fetchTime;

    public Config getConfig() {
        return config;
    }

    public String getETag() {
        return eTag;
    }

    public long getFetchTime() {
        return fetchTime;
    }

    public String getCacheString() {
        return cacheString;
    }

    public Entry withFetchTime(long fetchTime) {
        String cacheString = getCacheString();
        int fetchTimeIndex = cacheString.indexOf("\n");
        if (fetchTimeIndex == -1) {
            return this;
        }
        int eTagIndex = cacheString.indexOf("\n", fetchTimeIndex + 1);
        if (eTagIndex == -1) {
            return this;
        }
        String configJson = cacheString.substring(eTagIndex + 1);
        return new Entry(getConfig(), getETag(), configJson, fetchTime);
    }

    public boolean isExpired(long threshold) {
        return fetchTime <= threshold ;
    }
    public Entry(Config config, String eTag, String configJson, long fetchTime) {
        this.config = config;
        this.eTag = eTag;
        this.cacheString = serialize(fetchTime, eTag, configJson);
        this.fetchTime = fetchTime;
    }

    boolean isEmpty() {
        return EMPTY.equals(this);
    }

    public static final Entry EMPTY = new Entry(Config.EMPTY, "", "", Constants.DISTANT_PAST);

    private static String serialize(long fetchTime, String etag, String configJson) {
        return fetchTime + "\n" + etag + "\n" + configJson;
    }

    public static Entry fromString(String cacheValue) throws IllegalArgumentException {
        if (cacheValue == null || cacheValue.isEmpty()) {
            return Entry.EMPTY;
        }

        int fetchTimeIndex = cacheValue.indexOf("\n");
        int eTagIndex = cacheValue.indexOf("\n", fetchTimeIndex + 1);
        if (fetchTimeIndex < 0 || eTagIndex < 0) {
            throw new IllegalArgumentException("Number of values is fewer than expected.");
        }
        String fetchTimeRaw = cacheValue.substring(0, fetchTimeIndex);
        if (!DateTimeUtils.isValidDate(fetchTimeRaw)) {
            throw new IllegalArgumentException("Invalid fetch time: " + fetchTimeRaw);
        }
        long fetchTimeUnixMillis = Long.parseLong(fetchTimeRaw);


        String eTag = cacheValue.substring(fetchTimeIndex + 1, eTagIndex);
        if (eTag.isEmpty()) {
            throw new IllegalArgumentException("Empty eTag value.");
        }
        String configJson = cacheValue.substring(eTagIndex + 1);
        if (configJson.isEmpty()) {
            throw new IllegalArgumentException("Empty config jsom value.");
        }
        try {
            Config config = Utils.deserializeConfig(configJson);
            return new Entry(config, eTag, configJson, fetchTimeUnixMillis);
        } catch (Exception e) {
            throw new IllegalArgumentException("Invalid config JSON content: " + configJson);
        }
    }
}