Scaling ThreadPoolExecutor. Android. Java

Somewhere.java

    @NonNull
    @UiThread
    public Executor getThreadPool() {
        if (threadPool == null) {
            final String threadNamePrefix = getClass().getSimpleName();

            int corePoolSize = 0;
            int maxPoolSize = Math.max(2, Runtime.getRuntime().availableProcessors() * 2 + 1);
            long keepAliveTime = 10;

            ThreadPoolExecutor tp = new ThreadPoolExecutor(
                    corePoolSize, maxPoolSize, keepAliveTime, TimeUnit.SECONDS,
                    new LinkedTransferQueue<Runnable>() {
                        @Override
                        public boolean offer(Runnable e) {
                            return tryTransfer(e);
                        }
                    },
                    new ThreadFactory() {
                        final AtomicInteger counter = new AtomicInteger();

                        public Thread newThread(@NonNull Runnable runnable) {
                            return new Thread(runnable, threadNamePrefix + "-" + counter.incrementAndGet());
                        }
                    },
                    new RejectedExecutionHandler() {
                        @Override
                        public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
                            try {
                                executor.getQueue().put(r);
                            } catch (InterruptedException ex) {
                                Thread.currentThread().interrupt();
                            }
                        }
                    });

            tp.allowCoreThreadTimeOut(true);

            threadPool = tp;
        }

        return threadPool;
    }

https://stackoverflow.com/a/24493856/1891118