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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;

class FetchResponse {
    public enum Status {
        FETCHED,
        NOT_MODIFIED,
        FAILED
    }

    private final Status status;
    private final Entry entry;
    private final Object error;
    private final boolean fetchTimeUpdatable;

    public boolean isFetched() {
        return this.status == Status.FETCHED;
    }

    public boolean isNotModified() {
        return this.status == Status.NOT_MODIFIED;
    }

    public boolean isFailed() {
        return this.status == Status.FAILED;
    }

    public boolean isFetchTimeUpdatable() {
        return fetchTimeUpdatable;
    }

    public Entry entry() {
        return this.entry;
    }

    public Object error() {
       return error;
    }

    FetchResponse(Status status, Entry entry, Object error, boolean fetchTimeUpdatable) {
        this.status = status;
        this.entry = entry;
        this.error = error;
        this.fetchTimeUpdatable = fetchTimeUpdatable;
    }

    public static FetchResponse fetched(Entry entry) {
        return new FetchResponse(Status.FETCHED, entry == null ? Entry.EMPTY : entry, null, false);
    }

    public static FetchResponse notModified() {
        return new FetchResponse(Status.NOT_MODIFIED, Entry.EMPTY, null, true);
    }

    public static FetchResponse failed(Object error, boolean fetchTimeUpdatable) {
        return new FetchResponse(Status.FAILED, Entry.EMPTY, error, fetchTimeUpdatable);
    }
}