io.ebeaninternal.server.lib.DaemonExecutorService Maven / Gradle / Ivy
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package io.ebeaninternal.server.lib;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
/**
* A "CachedThreadPool" based on Daemon threads.
*
* The Threads are created as needed and once idle live for 60 seconds.
*/
public final class DaemonExecutorService {
private static final Logger logger = LoggerFactory.getLogger(DaemonExecutorService.class);
private final String namePrefix;
private final int shutdownWaitSeconds;
private final ExecutorService service;
/**
* Construct the DaemonThreadPool.
*
* @param shutdownWaitSeconds the time in seconds allowed for the pool to shutdown nicely. After
* this the pool is forced to shutdown.
*/
public DaemonExecutorService(int shutdownWaitSeconds, String namePrefix) {
this.service = Executors.newCachedThreadPool(new DaemonThreadFactory(namePrefix));
this.shutdownWaitSeconds = shutdownWaitSeconds;
this.namePrefix = namePrefix;
}
/**
* Execute the Runnable.
*/
public void execute(Runnable runnable) {
service.execute(runnable);
}
/**
* Shutdown this thread pool nicely if possible.
*
* This will wait a maximum of 20 seconds before terminating any threads still
* working.
*
*/
public void shutdown() {
synchronized (this) {
if (service.isShutdown()) {
logger.debug("DaemonExecutorService[{}] already shut down", namePrefix);
return;
}
try {
logger.debug("DaemonExecutorService[{}] shutting down...", namePrefix);
service.shutdown();
if (!service.awaitTermination(shutdownWaitSeconds, TimeUnit.SECONDS)) {
logger.info("DaemonExecutorService[{}] shut down timeout exceeded. Terminating running threads.", namePrefix);
service.shutdownNow();
}
} catch (Exception e) {
logger.error("Error during shutdown of DaemonThreadPool[" + namePrefix + "]", e);
e.printStackTrace();
}
}
}
}