import org.apache.catalina.session.StoreBase; //导入依赖的package包/类
private Manager getSessionManager(Context context)
{
	// Must be set for the persistent manager to work correctly.
	System.setProperty("org.apache.catalina.session.StandardSession.ACTIVITY_CHECK", "true");

	PersistentManager manager = new PersistentManager();
	StoreBase store;

	// Check if Migration has run and setup JDBC persistence
	if( !hibernateMigrationService.hasRunSystemMigration("com.tle.tomcat.migration.CreateTomcatSessionEntity") )
	{
		// Use filestore until JDBC setup complete
		LOGGER.info("Setting up temporary file session store");
		FileStore fileStore = new FileStore();
		fileStore.setDirectory(System.getProperty("java.io.tmpdir"));
		store = fileStore;
	}
	else
	{
		LOGGER.info("Setting up JDBC session store");
		JDBCStore jdbcStore = new JDBCStore();
		jdbcStore.setConnectionURL(dataSourceService.getSystemUrl());
		jdbcStore.setConnectionName(dataSourceService.getSystemUsername());
		jdbcStore.setConnectionPassword(dataSourceService.getSystemPassword());
		jdbcStore.setDriverName(dataSourceService.getDriverClass());
		jdbcStore.setSessionTable("tomcat_sessions");
		store = jdbcStore;
	}

	manager.setContext(context);
	manager.setProcessExpiresFrequency(3); // Every 30 seconds
	manager.setStore(store);
	// Persist immediately but leave in memory
	manager.setMaxIdleBackup(0);
	// Don't remove from memory for 30 minutes
	manager.setMaxIdleSwap((int) TimeUnit.MINUTES.toSeconds(30));

	return manager;
}
 

import org.apache.catalina.session.StoreBase; //导入依赖的package包/类
@Override
public void processExpires() {
  log.debug("Processing expired sessions");
  if (store instanceof StoreBase) {
    ((StoreBase) store).processExpires();
  }
}