confirmShutdown() — netty Function Reference

Source Code

transport/src/main/java/io/netty/channel/ManualIoEventLoop.java lines 559–608

    private boolean confirmShutdown() {
        if (!isShuttingDown()) {
            return false;
        }

        if (!inEventLoop()) {
            throw new IllegalStateException("must be invoked from an event loop");
        }

        cancelScheduledTasks();

        if (gracefulShutdownStartTime == 0) {
            gracefulShutdownStartTime = ticker.nanoTime();
        }

        if (runAllTasks(-1, false) > 0) {
            if (isShutdown()) {
                // Executor shut down - no new tasks anymore.
                return true;
            }

            // There were tasks in the queue. Wait a little bit more until no tasks are queued for the quiet period or
            // terminate if the quiet period is 0.
            // See https://github.com/netty/netty/issues/4241
            if (gracefulShutdownQuietPeriod == 0) {
                return true;
            }
            return false;
        }

        final long nanoTime = ticker.nanoTime();

        if (isShutdown() || nanoTime - gracefulShutdownStartTime > gracefulShutdownTimeout) {
            return true;
        }

        if (nanoTime - lastExecutionTime <= gracefulShutdownQuietPeriod) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                // Ignore
            }

            return false;
        }

        // No tasks were added for last quiet period - hopefully safe to shut down.
        // (Hopefully because we really cannot make a guarantee that there will be no execute() calls by a user.)
        return true;
    }