futuredata.java

来自「< Java多线程设计模式>> 一书」· Java 代码 · 共 22 行

public class FutureData implements Data {
    private RealData realdata = null;
    private boolean ready = false;
    public synchronized void setRealData(RealData realdata) {
        if (ready) {                        
            return;     // balk
        }
        this.realdata = realdata;
        this.ready = true;
        notifyAll();
    }
    public synchronized String getContent() {
        while (!ready) {
            try {
                wait();
            } catch (InterruptedException e) {
            }
        }
        return realdata.getContent();
    }
}