com.shipdream.lib.android.mvc.controller.internal.BaseControllerImpl Maven / Gradle / Ivy
/*
* Copyright 2016 Kejun Xia
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.shipdream.lib.android.mvc.controller.internal;
import com.shipdream.lib.android.mvc.MvcBean;
import com.shipdream.lib.android.mvc.controller.BaseController;
import com.shipdream.lib.android.mvc.event.BaseEventC;
import com.shipdream.lib.android.mvc.event.BaseEventV;
import com.shipdream.lib.android.mvc.event.bus.EventBus;
import com.shipdream.lib.android.mvc.event.bus.annotation.EventBusC;
import com.shipdream.lib.android.mvc.event.bus.annotation.EventBusV;
import com.shipdream.lib.android.mvc.manager.internal.BaseManagerImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ExecutorService;
import javax.inject.Inject;
/**
* Base controller implementation implements {@link BaseController}. A controller is responsible to
* manage the corresponding view. When multiple controllers have shared logic or data, break them
* out into a manager extending {@link BaseManagerImpl}. For example, a common scenario is multiple
* controllers can share an AccountManager and monitor the account change events.
*/
public abstract class BaseControllerImpl extends MvcBean implements BaseController {
interface AndroidPoster {
void post(EventBus eventBusV, BaseEventV eventV);
}
static AndroidPoster androidPoster;
protected Logger logger = LoggerFactory.getLogger(getClass());
@Inject
@EventBusV
EventBus eventBus2V;
@Inject
@EventBusC
EventBus eventBus2C;
@Inject
ExecutorService executorService;
/**
* Called when the controller is constructed. Note that it could be called either when the
* controller is instantiated for the first time or restored by views.
*
* The model of the controller will be instantiated by model's default no-argument
* constructor here whe {@link #modelType()} doesn't return null.
*/
public void onConstruct() {
super.onConstruct();
eventBus2C.register(this);
}
/**
* Called when the controller is disposed. This occurs when the controller is de-referenced and
* not retained by any objects.
*/
@Override
public void onDisposed() {
super.onDisposed();
eventBus2C.unregister(this);
}
@Override
public void bindModel(Object sender, MODEL model) {
super.bindModel(model);
}
/**
* Model represents the state of the view this controller is managing.
* @return Null if the controller doesn't need to get its model saved and restored automatically
* when {@link #modelType()} returns null.
*/
@Override
public MODEL getModel() {
return super.getModel();
}
/**
* Post an event to controllers. The event will be posted on the same thread that the
* caller is running on.
*
* @param event event to controllers
*/
protected void postEvent2C(final BaseEventC event) {
if (eventBus2C != null) {
eventBus2C.post(event);
} else {
logger.warn("Trying to post event {} to EventBusC which is null", event.getClass().getName());
}
}
/**
* Post an event to views on
*
* - Android main thread -- when detected android OS. Note that, if the caller is on main thread, event will be
* execute immediately on the main thread. Otherwise it will be post to the main thread message queue.
* - Same thread of caller -- if on usual JVM
*
*
* @param event event to views
*/
protected void postEvent2V(final BaseEventV event) {
if (androidPoster != null) {
//Run on android OS
androidPoster.post(eventBus2V, event);
} else {
if (eventBus2V != null) {
eventBus2V.post(event);
} else {
logger.warn("Trying to post event {} to EventBusV which is null", event.getClass().getName());
}
}
}
/**
* Run async task on the default ExecutorService injected as a field of this class. Exceptions
* occur during running the task will be suppressed but logged at warning level. Be careful,
* only use this method when you are sure there will be no exceptions occur during the execution
* of async task, or you want to ignore all exceptions intentionally. Otherwise use
* {@link #runAsyncTask(Object, AsyncTask, AsyncExceptionHandler)} to handle errors explicitly.
*
* @param sender who initiated this task
* @param asyncTask task to execute
* @return returns the reference of {@link AsyncTask} that can be used to query its state and cancel it.
*/
protected AsyncTask runAsyncTask(Object sender, final AsyncTask asyncTask) {
return runAsyncTask(sender, executorService, asyncTask, null);
}
/**
* Run async task on the default ExecutorService injected as a field of this class. Exceptions
* occur during running the task will be handled by the given {@link AsyncExceptionHandler}.
*
* @param sender who initiated this task
* @param asyncTask task to execute
* @param asyncExceptionHandler error handler for the exception during running the task
* @return the reference of {@link AsyncTask} that can be used to query its state and cancel it.
*/
protected AsyncTask runAsyncTask(Object sender, final AsyncTask asyncTask,
final AsyncExceptionHandler asyncExceptionHandler) {
return runAsyncTask(sender, executorService, asyncTask, asyncExceptionHandler);
}
/**
* Run async task on the given ExecutorService. Exceptions occur during running the task will be
* suppressed but logged at warning level. Be careful, only use this method when you are sure
* there will be no exceptions occur during the execution of async task, or you want to ignore
* all exceptions intentionally. Otherwise use
* {@link #runAsyncTask(Object, java.util.concurrent.ExecutorService, AsyncTask, AsyncExceptionHandler)}
* to handle errors explicitly.
*
* @param sender who initiated this task
* @param executorService the executor service provided to execute the async task
* @param asyncTask task to execute
* @return the reference of {@link AsyncTask} that can be used to query its state and cancel it.
*/
protected AsyncTask runAsyncTask(Object sender, ExecutorService executorService,
final AsyncTask asyncTask) {
return runAsyncTask(sender, executorService, asyncTask, null);
}
/**
* Run async task on the given ExecutorService. Exceptions occur during running the task will be
* handled by the given {@link AsyncExceptionHandler}.
*
* @param sender who initiated this task
* @param executorService the executor service provided to execute the async task
* @param asyncTask task to execute
* @param asyncExceptionHandler error handler for the exception during running the task. If null
* is given all exceptions occur during the execution of the async
* task will be suppressed with warning level log.
* @return the reference of {@link AsyncTask} that can be used to query its state and cancel it.
*/
protected AsyncTask runAsyncTask(Object sender, ExecutorService executorService,
final AsyncTask asyncTask,
final AsyncExceptionHandler asyncExceptionHandler) {
asyncTask.state = AsyncTask.State.RUNNING;
executorService.submit(new Runnable() {
@Override
public void run() {
try {
asyncTask.execute();
if (asyncTask.state != AsyncTask.State.CANCELED) {
asyncTask.state = AsyncTask.State.DONE;
}
} catch (Exception e) {
asyncTask.state = AsyncTask.State.ERRED;
if (asyncExceptionHandler == null) {
logger.warn(e.getMessage(), e);
} else {
asyncExceptionHandler.handleException(e);
}
}
}
});
return asyncTask;
}
}
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