com.scudata.dm.InputStreamManager Maven / Gradle / Ivy

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SPL(Structured Process Language) A programming language specially for structured data computing.

There is a newer version: 20240823

package com.scudata.dm;

import java.util.LinkedList;

/**
 * ???ڶ԰??????????????????й???
 * @author WangXiaoJun
 *
 */
public final class InputStreamManager extends Thread {
	private static InputStreamManager manager;
	
	// ?ڵȴ???ȡ???ݵ???????
	private LinkedList bisList = new LinkedList();

	private InputStreamManager(ThreadGroup group) {
		super(group, "InputStreamManager");
	}

	/**
	 * ȡ??????????????
	 * @return InputStreamManager
	 */
	public synchronized static InputStreamManager getInstance() {
		if (manager == null) { // || !manager.isAlive()
			ThreadGroup group = currentThread().getThreadGroup();
			while (true) {
				ThreadGroup g = group.getParent();
				if (g == null) {
					break;
				} else {
					group = g;
				}
			}

			manager = new InputStreamManager(group);
			manager.setDaemon(true);
			manager.start();
		}

		return manager;
	}

	/**
	 * ????????????????ж?ȡһ??????
	 * @param is
	 */
	public void read(BlockInputStream is) {
		synchronized(bisList) {
			bisList.add(is);
			bisList.notify();
		}
	}

	/**
	 * ?????ݺ???
	 */
	public void run() {
		while (true) {
			synchronized(bisList) {
				if (bisList.size() == 0) {
					try {
						// ?ȴ???????????read
						bisList.wait();
					} catch (InterruptedException e) {
					}
				}
			}

			// ѭ???????????У?ֱ?????е???????????ȡ??????
			while (true) {
				BlockInputStream bis;
				synchronized(bisList) {
					if (bisList.size() == 0) {
						break;
					}
					
					bis = bisList.removeFirst();
				}

				bis.fillBuffers();
			}
		}
	}
}