# Distributed Shared Objects for Android
A platform that provides shared objects for ad-hoc networks of Android devices.

## Goal
Fault-tolerant, distributed, fast synchronization of application state across
several Android phones. A suitable library for programmers to interact with the
system.

## Feature list
An incomplete list of implemented and planned features.

* Fault-tolerance with automatic master selection. (0.6)
* Network discovery with directory service. (0.3)
* Ability to share variables with other peers. (Implemented, 0.1)

## Example
With Same you can share variables easily, like so:

```Java
// First: Some setup to get all your devices connected to the same network.
// Then, in your Activity:
ClientInterfaceBridge client = new ClientInterfaceBridge(this);
client.connect();
try {
    // A VariableFactory is used to create distributed objects.
    VariableFactory variableFactory = client.createVariableFactory();
    Variable<String> myVariable = variableFactory.createString("MyVariable");

    // Set the variable. It is automatically distributed to your other devices.
    myVariable.set("Hello, Same!");

    // Run update() to get the most recent version.
    myVariable.update();

    // Get the current value.
    Log.i("The current value is: " + myVariable.get());
} finally {
    // Always remember to disconnect.
    client.disconnect();
}
```

## Release log
Pre-1.0: A release is a milestone in the project. Whenever the system seems to
be working fairly well, a commit is tagged as the release version.

### 0.6.1
* Tag: 0.6.1
* Improved discovery service. Overwrite network after master takeover.
* Add master kill switch in SystemService.
* RPC logging support.
* Monitoring support with SystemService and GetSystemStatus.
* Fixes VariableUpdater.
* Fixes lookup bug with duplicate network names.
* Experiment and support for generating statistics. (Statsserver)

### 0.5
* Tag: 0.5
* Add timeouts to outgoing RPCs. (Actually a protobuf-simple-rpc feature)
* Master takeover works again.
* Timed out queries to old master doesn't interfere with master election.

### 0.4
* Tag: 0.4.
* Use protocol buffer services based on [protobuf-simple-rpc](https://github.com/orbekk/protobuf-simple-rpc).
* Advertise new master. => New clients can join the network.
* Kill SameService if SameController fails. (E.g. when binding Jetty).
* Known issue: Master takeover doesn't work anymore.

### 0.3
* Tag: 0.3
* Centralized network discovery: Enables network discovery on networks that
  don't support UDP broadcasts.
* Master takeover: When the master dies, another client takes over.
  This version does not recover inconsistent state.
  This version does not advertise the new master URL.
* UDP broadcast discovery no longer supported. Uses centralized discovery only.

### 0.2
* Tag: 0.2-new-main-screen
* Many Android related bugs were fixed. App is generally stable.
* More sophisticated state handling in the demo Activities.
* Benchmark activity shows reasonable performance on Galaxy S.
* README file that makes sense.

### 0.1
* Tag: working-graphics-0.1
* An interactive graphics demo with several participants.
* Web management on http://ip:port/_/state