com.scudata.dm.cursor.CursorSkipper Maven / Gradle / Ivy

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

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package com.scudata.dm.cursor;

import com.scudata.thread.Job;
import com.scudata.thread.ThreadPool;

/**
 * ???ڶ??̴߳??α????????ݵ????񣬽????ȡ?ߺ??????ᱻ???뵽?̳߳??У?????????????
 * @author WangXiaoJun
 *
 */
class CursorSkipper extends Job {
	//private ThreadPool threadPool; // ?̳߳?
	private ICursor cursor; // Ҫȡ?????α?
	private long skipCount; // ÿ???????ļ?¼??
	private long actualSkipCount; // ʵ???????ļ?¼??

	/**
	 * ???????α?????ָ????¼????????ʹ??getActualSkipCount?õ?ʵ???????ļ?¼??
	 * @param threadPool ?̳߳?
	 * @param cursor ?α?
	 * @param count ÿ???????ļ?¼??
	 */
	public CursorSkipper(ThreadPool threadPool, ICursor cursor, long count) {
		//this.threadPool = threadPool;
		this.cursor = cursor;
		this.skipCount = count;
		threadPool.submit(this);
	}
	
	/**
	 * ȡʵ???????ļ?¼??
	 * @return long
	 */
	public long getActualSkipCount() {
		join();
		long count = actualSkipCount;
		actualSkipCount = 0;
		
		//if (count >= skipCount) {
		//	threadPool.submit(this);
		//}
		
		return count;
	}

	/**
	 * ???̳߳?????̵߳??ã??????α?????
	 */
	public void run() {
		actualSkipCount = cursor.skip(skipCount);
	}
}