internal.sdmxdl.cli.ext.SameThreadExecutorService Maven / Gradle / Ivy

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package internal.sdmxdl.cli.ext;

import java.util.Collections;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.TimeUnit;

// https://stackoverflow.com/a/13726463
public final class SameThreadExecutorService extends AbstractExecutorService {

    //volatile because can be viewed by other threads
    private volatile boolean terminated;

    @Override
    public void shutdown() {
        terminated = true;
    }

    @Override
    public boolean isShutdown() {
        return terminated;
    }

    @Override
    public boolean isTerminated() {
        return terminated;
    }

    @Override
    public boolean awaitTermination(long theTimeout, TimeUnit theUnit) throws InterruptedException {
        shutdown(); // TODO ok to call shutdown? what if the client never called shutdown???
        return terminated;
    }

    @Override
    public List shutdownNow() {
        return Collections.emptyList();
    }

    @Override
    public void execute(Runnable theCommand) {
        theCommand.run();
    }
}