Concurrency>cat SingleThreadRender.java
import java.util.*;
/**
* SingleThreadRendere
* <p/>
* Rendering page elements sequentially
*/
public abstract class SingleThreadRender {
public static void main(String[] args) {
SingleThreadRender str = new SingleThreadRender() {
@Override
void renderText(CharSequence s) {
try {
Thread.sleep(2000);
System.out.println(Thread.currentThread().toString() + " renders text finished.");
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("rendering text: " + s);
}
@Override
List<ImageInfo> scanForImageInfo(CharSequence s) {
List<ImageInfo> imageInfos = new ArrayList<>();
for(int i = 0; i < 5; i++) {
imageInfos.add(new ImageInfo() {
@Override
public ImageData downloadImage() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return new ImageData() {};
}
});
}
return imageInfos;
}
@Override
void renderImage(ImageData i) {
System.out.println("rendering image: " + i.toString());
}
};
str.renderPage("page HTML code here");
}
void renderPage(CharSequence source) {
renderText(source);
List<ImageData> imageData = new ArrayList<ImageData>();
for (ImageInfo imageInfo : scanForImageInfo(source))
imageData.add(imageInfo.downloadImage());
for (ImageData data : imageData)
renderImage(data);
renderText(source);
}
interface ImageData {
}
interface ImageInfo {
ImageData downloadImage();
}
abstract void renderText(CharSequence s);
abstract List<ImageInfo> scanForImageInfo(CharSequence s);
abstract void renderImage(ImageData i);
}
Concurrency>javac SingleThreadRender.java
Concurrency>date; java SingleThreadRender; date
Sat Jul 15 16:47:06 EDT 2017
Thread[main,5,main] renders text finished.
rendering text: page HTML code here
rendering image: SingleThreadRender$1$1$1@70dea4e
rendering image: SingleThreadRender$1$1$1@5c647e05
rendering image: SingleThreadRender$1$1$1@33909752
rendering image: SingleThreadRender$1$1$1@55f96302
rendering image: SingleThreadRender$1$1$1@3d4eac69
Thread[main,5,main] renders text finished.
rendering text: page HTML code here
Sat Jul 15 16:47:20 EDT 2017
Concurrency>
