exhesham

.gradle
/local.properties
/.idea/workspace.xml
/.idea/libraries
.DS_Store
/build

exhesham

<application>
  ....
<meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

</application>

<uses-permission android:name="android.permission.INTERNET" />

exhesham

[LOG]: "Total tasks: 10" 
[LOG]: "worker 1 is started" 
[LOG]: "worker 1 handles task" 
[LOG]: "  --> Task 1 started" 
[LOG]: "worker 2 is started" 
[LOG]: "worker 2 handles task" 
[LOG]: "  --> Task 2 started" 
[LOG]: "worker 3 is started" 
[LOG]: "worker 3 handles task" 
[LOG]: "  --> Task 3 started" 

exhesham

await Promise.all([worker(1), worker(2), worker(3), worker(4)]);

exhesham

let worker = async (index: number) => {
    console.log(`worker ${index} is started`);
    while(tasksQueue.length > 0) {
        console.log(`worker ${index} handles task`);
        let task = tasksQueue[0]; // should be atomic
        tasksQueue = tasksQueue.slice(1);
        await task();
        console.log(`worker ${index} finished handling task`);
    }
    console.log(`worker ${index} is retired`);

exhesham

let idx =1, tasksQueue = Array(numberOfTasks).fill(1)
    .map(v => Math.round(Math.random() * 30) + v)
    .map(v => (() => taskExecutor({delay: v, index: `${idx++}` })));

exhesham

[LOG]: "* start running batch 0" 
[LOG]: "  --> Task 0 started" 
[LOG]: "  --> Task 1 started" 
[LOG]: "  --> Task 2 started" 
[LOG]: "  <-- Task 0 finished" 
[LOG]: "  <-- Task 1 finished" 
[LOG]: "  <-- Task 2 finished" 
[LOG]: "* finished running batch 0" 
[LOG]: "* start running batch 3" 
[LOG]: "  --> Task 3 started" 

exhesham

let taskExecutor = async (task: {delay: number, index: string}) => {
    console.log(`  --> Task ${task.index} started`);
    await sleep(task.delay);
    console.log(`  <-- Task ${task.index} finished`);
};

exhesham

async function solution1() {
    for(let i = 0; i < tasksSleepInput.length; i+= chunkSize) {
        let batch = tasksSleepInput.slice(i, i + chunkSize);
        console.log(`* start running batch ${i}`);
        await Promise.all(batch.map(taskExecutor));
        console.log(`* finished running batch ${i}`);
    }
}

exhesham

const chunkSize = 3;
const numberOfTasks = 10;
let tasksSleepInput = Array(numberOfTasks).fill(30).map(v => ({delay: v, index: '' }));
// add indices
Object.keys(tasksSleepInput).forEach(k => tasksSleepInput[Number.parseInt(k)].index = k);