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  package org.apache.cayenne.datasource;
  
  /**
   * A thread that manages the state of a {@link UnmanagedPoolingDataSource} instance,
   * performing periodic expansion/contraction of pooled connections, and
   * orchestrating shutdown.
   * 
   * @since 4.0
   */
  class PoolingDataSourceManager extends Thread {
  
  	private volatile boolean shouldStop;
  	private UnmanagedPoolingDataSource dataSource;
  	private long managerWakeTime;
  
  	PoolingDataSourceManager(UnmanagedPoolingDataSource dataSource, long managerWakeTime) {
  		setName("PoolingDataSourceManager-" + dataSource.hashCode());
  		setDaemon(true);
  
  		this.dataSource = dataSource;
  		this.shouldStop = false;
  		this.managerWakeTime = managerWakeTime;
  	}
  
  	void shutdown() {
  		shouldStop = true;
  		dataSource.close();
  		interrupt();
  	}
  
  	UnmanagedPoolingDataSource getDataSource() {
  		return dataSource;
  	}
  
  	boolean isStopped() {
  		return shouldStop;
  	}
  
  	@Override
  	public void run() {
  		while (true) {
  
  			try {
  				Thread.sleep(managerWakeTime);
  			} catch (InterruptedException iex) {
  				// ignore...
  			}
  
  			if (shouldStop) {
  				break;
  			}
  
  			dataSource.managePool();
  		}
  	}
  }