com.launchdarkly.sdk.android.BackgroundThreadExecutor Maven / Gradle / Ivy

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package com.launchdarkly.sdk.android;

import android.os.Process;

import androidx.annotation.NonNull;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * Executes all threads with priority android.os.Process.THREAD_PRIORITY_BACKGROUND.
 */
class BackgroundThreadExecutor {

    private final ThreadFactory threadFactory;

    BackgroundThreadExecutor() {
        this.threadFactory = new PriorityThreadFactory(Process.THREAD_PRIORITY_BACKGROUND);
    }

    @SuppressWarnings("SameParameterValue")
    ExecutorService newFixedThreadPool(int nThreads) {
        return new ThreadPoolExecutor(nThreads, nThreads, 0L, TimeUnit.MILLISECONDS,
                new LinkedBlockingQueue(), threadFactory);
    }

    private static class PriorityThreadFactory implements ThreadFactory {

        private final int threadPriority;

        PriorityThreadFactory(int threadPriority) {
            this.threadPriority = threadPriority;
        }

        @Override
        public Thread newThread(@NonNull final Runnable runnable) {
            return new Thread(() -> {
                try {
                    Process.setThreadPriority(threadPriority);
                } catch (Throwable ignored) {
                    // ignore
                }
                runnable.run();
            });
        }

    }

}