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package firebase; | |
public class FirebasePushIdGenerator { | |
// Modeled after base64 web-safe chars, but ordered by ASCII. | |
private final static String PUSH_CHARS = "-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"; | |
// Timestamp of last push, used to prevent local collisions if you push twice in one ms. | |
private static long LAST_PUSH_TIME = 0L; | |
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@ProductionComponent( | |
dependencies = AppComponent.class, | |
modules = GithubApiProducerModule.class | |
) | |
public interface AppProductionComponent { | |
ListenableFuture<UserManager> userManager(); | |
ListenableFuture<UserModule.Factory> userModuleFactory(); | |
} |
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/** | |
* Fancy ID generator that creates 20-character string identifiers with the following properties: | |
* | |
* 1. They're based on timestamp so that they sort *after* any existing ids. | |
* 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs. | |
* 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly). | |
* 4. They're monotonically increasing. Even if you generate more than one in the same timestamp, the | |
* latter ones will sort after the former ones. We do this by using the previous random bits | |
* but "incrementing" them by 1 (only in the case of a timestamp collision). | |
*/ |
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
This article is now published on my website: A one-off git repo server.