Introduction

Hosted mode currently takes too long to start up. A significant portion of this startup time is in compiling from source. Instant Hosted Mode proposes to make use of existing class files where possible.

Work in progress

Considerations

• JSNI is not preserved in class files, so we will still need to read from source. We can however, save the JSNI to a file and reuse it if the source file has not changed.
• It isn't clear how super-source fits in.
• External bytecode rewriting tools, such as emma, need to be considered.
• The current generator API makes some aspects of this more complicated, so it might be useful to alter the API (and might be combined with other ideas for allowing generators to run outside a GWT compile)
• Method parameter names are not generally available (though it might be possible to use debug information to get them), and some generators require them.

Implementation Plan

Map dataMap = ...; ProgressManager progressManager = new ProgressManager(); progressManager.add(new ProgressTimer<Map>(dataMap, 5, 30, "progress message 1") { public void progressRun() { Map dataMap = getData(); ... } }); progressManager.add(new ProgressTimer<Map>(dataMap, 5, 50, "progress message 2") { public void progressRun() { Map dataMap = getData(); ... } }); progressManager.add(new ProgressTimer(5, 85, "progress message 3") { public void progressRun() { ... } }); progressManager.start();

진행할 과정들을 나눈 후에 ProgressTimer 를 구현하여 progressRun 메소드에서 실행하도록 한후 ProgressManager 에 추가하는 방식으로 추가된 순서대로 실행을 하도록 하는 방식입니다. 약간의 딜레이가 있을 경우에는 프로세스가 화면 렌더링을 하기전에 즉, 화면이 멈춰보이는 상태 전에 MessageBox 의 progress 를 업데이트합니다.

추가적으로 생성할 때 내부에서 사용할 객체를 넘겨주기 때문에 필요한 객체를 효과적으로 사용할 수 있습니다.


[#M_관련 소스|접기|ㅁ ProgressManager.java
public class ProgressManager { /** * 처음 시작할 타이머 */ private ProgressTimer firstTimer; /** * 가장 마지막에 추가된 타이머 */ private ProgressTimer lastTimer; /** * ProgressTimer 를 추가합니다. * @param timer 추가할 타이머 */ public void add(ProgressTimer timer) { if (firstTimer == null) { firstTimer = timer; lastTimer = timer; } else { lastTimer.setNextTimer(timer); lastTimer = timer; } } /** * first ProgressTimer를 시작합니다. */ public void start() { if (firstTimer != null) { firstTimer.schedule(firstTimer.getDelayMillis()); } } }


ㅁ ProgressTimer.java
import com.google.gwt.user.client.Timer; import com.gwtext.client.widgets.MessageBox; public abstract class ProgressTimer<T> extends Timer { /** * 타이머에서 사용할 데이터 */ private T data; /** * 타이머 딜레이 */ private int delayMillis; /** * 진행 퍼센테이지 */ private int percentage; /** * 진행 메세지 */ private String message; /** * 다음번에 진행할 타이머 */ private ProgressTimer nextTimer; public ProgressTimer(int delayMilli, int percentage) { this(null, delayMilli, percentage); } public ProgressTimer(T data, int delayMilli, int percentage) { this(data, delayMilli, percentage, percentage + "%"); } public ProgressTimer(int delayMilli, int percentage, String message) { this(null, delayMilli, percentage, message); } public ProgressTimer(T data, int delayMilli, int percentage, String message) { this.data = data; this.delayMillis = delayMilli; this.percentage = percentage; this.message = message; } public T getData() { return data; } public int getDelayMillis() { return delayMillis; } public void setNextTimer(ProgressTimer nextTimer) { this.nextTimer = nextTimer; } public void run() { progressRun(); if (nextTimer != null) { nextTimer.schedule(nextTimer.getDelayMillis()); } else { MessageBox.hide(); } } public abstract void progressRun(); public void schedule(int delayMillis) { MessageBox.updateProgress(percentage, message); super.schedule(delayMillis); } }