Superinit

Async dependency tree loader

Gradle

repositories {
    jcenter()
}

dependencies {
	// Your dependencies
	...

	// Async dependency tree loader
    // https://github.com/ncornette/superinit
    compile 'com.ncornette.superinit:superinit:0.9.7'
}

Usage

Wrap any Runnable into a InitNode object, then define dependencies :

    InitNode nodeA = new InitNode(runnableA);
    InitNode nodeB = new InitNode(runnableB);
    InitNode nodeC = new InitNode(runnableC);

    // Setup dependencies
    nodeA.dependsOn(nodeB);

Then use InitLoader.load() to execute all nodes in order based on dependencies, and in parallel when possible.

    InitLoader initLoader =  new InitLoader(3); // N Threads in Thread pool executor

    // Execute tasks
    initLoader.load(loaderCallback, nodeA, nodeB, nodeC);

Use the InitLoaderCallback interface to be notified of the InitLoader

public interface InitLoaderCallback {

    // Is called once on success, even if error occurred
    // Not called if InitLoader.interrupt() is called during execution 
    void onFinished();

    // Is called each time a node execution fails with an Exception
    void onNodeError(NodeExecutionError nodeError);

    // Is called when an exception occurs outside a node execution
    void onError(Throwable error);

}

Features

A ThreadpoolExecutor with a fixed number of Threads will excute the tasks. Even with One Thread, execution order is guaranteed to be respected.

Circular dependencies are prevented as early as possible, and will throw IllegalArgumentException :

• When adding a dependency with dependsOn() for direct circular dependencies.
• When calling Initloader.load() for indirect circular dependencies.

Nodes use CountDownLatch to wait for execution of their dependencies and to notify their execution is finished.

Reference

Dependency Resolving Algorithm

License

Copyright 2016 Nicolas Cornette

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.