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Internal surgery to AppStateManager to provide more

Browse Source 
consistent app state lifecycle, fix some state transition
related bugs, and stop confusing users... well, at least
confusing them less hopefully.


git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8524 75d07b2b-3a1a-0410-a2c5-0572b91ccdca
3.0
PSp..om 13 years ago
parent 2a65ca4cb7
commit cf18f48182
1 changed files with 122 additions and 32 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 154
      engine/src/core/com/jme3/app/state/AppStateManager.java

154
engine/src/core/com/jme3/app/state/AppStateManager.java
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@ -34,7 +34,9 @@ package com.jme3.app.state;
import com.jme3.app.Application;
import com.jme3.renderer.RenderManager;
import java.util.ArrayList;
import com.jme3.util.SafeArrayList;
import java.util.Arrays;
import java.util.List;
/**
* The <code>AppStateManager</code> holds a list of {@link AppState}s which
@ -42,13 +44,50 @@ import java.util.ArrayList;
* When an {@link AppState} is attached or detached, the
* {@link AppState#stateAttached(com.jme3.app.state.AppStateManager) } and
* {@link AppState#stateDetached(com.jme3.app.state.AppStateManager) } methods
* will be called respectively.
* will be called respectively.
*
* @author Kirill Vainer
* <p>The lifecycle for an attached AppState is as follows:</p>
* <ul>
* <li>stateAttached() : called when the state is attached on the thread on which
* the state was attached.
* <li>initialize() : called ONCE on the render thread at the beginning of the next
* AppStateManager.update().
* <li>stateDetached() : called when the state is attached on the thread on which
* the state was detached. This is not necessarily on the
* render thread and it is not necessarily safe to modify
* the scene graph, etc..
* <li>cleanup() : called ONCE on the render thread at the beginning of the next update
* after the state has been detached or when the application is
* terminating.
* </ul>
*
* @author Kirill Vainer, Paul Speed
*/
public class AppStateManager {
private final ArrayList<AppState> states = new ArrayList<AppState>();
/**
* List holding the attached app states that are pending
* initialization. Once initialized they will be added to
* the running app states.
*/
private final SafeArrayList<AppState> initializing = new SafeArrayList<AppState>(AppState.class);
/**
* Holds the active states once they are initialized.
*/
private final SafeArrayList<AppState> states = new SafeArrayList<AppState>(AppState.class);
/**
* List holding the detached app states that are pending
* cleanup.
*/
private final SafeArrayList<AppState> terminating = new SafeArrayList<AppState>(AppState.class);
// All of the above lists need to be thread safe but access will be
// synchronized separately.... but always on the states list. This
// is to avoid deadlocking that may occur and the most common use case
// is that they are all modified from the same thread anyway.
private final Application app;
private AppState[] stateArray;
@ -56,12 +95,21 @@ public class AppStateManager {
this.app = app;
}
protected AppState[] getArray(){
protected AppState[] getInitializing() {
synchronized (states){
if (stateArray == null){
stateArray = states.toArray(new AppState[states.size()]);
}
return stateArray;
return initializing.getArray();
}
}
protected AppState[] getTerminating() {
synchronized (states){
return terminating.getArray();
}
}
protected AppState[] getStates(){
synchronized (states){
return states.getArray();
}
}
@ -75,10 +123,9 @@ public class AppStateManager {
*/
public boolean attach(AppState state){
synchronized (states){
if (!states.contains(state)){
if (!states.contains(state) && !initializing.contains(state)){
state.stateAttached(this);
states.add(state);
stateArray = null;
initializing.add(state);
return true;
}else{
return false;
@ -98,7 +145,11 @@ public class AppStateManager {
if (states.contains(state)){
state.stateDetached(this);
states.remove(state);
stateArray = null;
terminating.add(state);
return true;
} else if(initializing.contains(state)){
state.stateDetached(this);
initializing.remove(state);
return true;
}else{
return false;
@ -116,7 +167,7 @@ public class AppStateManager {
*/
public boolean hasState(AppState state){
synchronized (states){
return states.contains(state);
return states.contains(state) || initializing.contains(state);
}
}
@ -128,9 +179,19 @@ public class AppStateManager {
*/
public <T extends AppState> T getState(Class<T> stateClass){
synchronized (states){
int num = states.size();
for (int i = 0; i < num; i++){
AppState state = states.get(i);
AppState[] array = getStates();
for (AppState state : array) {
if (stateClass.isAssignableFrom(state.getClass())){
return (T) state;
}
}
// This may be more trouble than its worth but I think
// it's necessary for proper decoupling of states and provides
// similar behavior to before where a state could be looked
// up even if it wasn't initialized. -pspeed
array = getInitializing();
for (AppState state : array) {
if (stateClass.isAssignableFrom(state.getClass())){
return (T) state;
}
@ -139,16 +200,51 @@ public class AppStateManager {
return null;
}
protected void initializePending(){
AppState[] array = getInitializing();
synchronized( states ) {
// Move the states that will be initialized
// into the active array. In all but one case the
// order doesn't matter but if we do this here then
// a state can detach itself in initialize(). If we
// did it after then it couldn't.
List<AppState> transfer = Arrays.asList(array);
states.addAll(transfer);
initializing.removeAll(transfer);
}
for (AppState state : array) {
state.initialize(this, app);
}
}
protected void terminatePending(){
AppState[] array = getTerminating();
for (AppState state : array) {
state.cleanup();
}
synchronized( states ) {
// Remove just the states that were terminated...
// which might now be a subset of the total terminating
// list.
terminating.removeAll(Arrays.asList(array));
}
}
/**
* Calls update for attached states, do not call directly.
* @param tpf Time per frame.
*/
public void update(float tpf){
AppState[] array = getArray();
for (AppState state : array){
if (!state.isInitialized())
state.initialize(this, app);
// Cleanup any states pending
terminatePending();
// Initialize any states pending
initializePending();
// Update enabled states
AppState[] array = getStates();
for (AppState state : array){
if (state.isEnabled()) {
state.update(tpf);
}
@ -156,15 +252,12 @@ public class AppStateManager {
}
/**
* Calls render for all attached states, do not call directly.
* Calls render for all attached and initialized states, do not call directly.
* @param rm The RenderManager
*/
public void render(RenderManager rm){
AppState[] array = getArray();
AppState[] array = getStates();
for (AppState state : array){
if (!state.isInitialized())
state.initialize(this, app);
if (state.isEnabled()) {
state.render(rm);
}
@ -172,14 +265,11 @@ public class AppStateManager {
}
/**
* Calls render for all attached states, do not call directly.
* Calls render for all attached and initialized states, do not call directly.
*/
public void postRender(){
AppState[] array = getArray();
AppState[] array = getStates();
for (AppState state : array){
if (!state.isInitialized())
state.initialize(this, app);
if (state.isEnabled()) {
state.postRender();
}
@ -190,7 +280,7 @@ public class AppStateManager {
* Calls cleanup on attached states, do not call directly.
*/
public void cleanup(){
AppState[] array = getArray();
AppState[] array = getStates();
for (AppState state : array){
state.cleanup();
}

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