/*
* Copyright (c) 2011 PonySDK
* Owners:
* Luciano Broussal <luciano.broussal AT gmail.com>
* Mathieu Barbier <mathieu.barbier AT gmail.com>
* Nicolas Ciaravola <nicolas.ciaravola.pro AT gmail.com>
*
* WebSite:
* http://code.google.com/p/pony-sdk/
*
* 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.ponysdk.ui.terminal.ui;
import java.util.HashMap;
import java.util.Map;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.RepeatingCommand;
import com.ponysdk.ui.terminal.Dictionnary.HANDLER;
import com.ponysdk.ui.terminal.Dictionnary.PROPERTY;
import com.ponysdk.ui.terminal.Dictionnary.TYPE;
import com.ponysdk.ui.terminal.UIBuilder;
import com.ponysdk.ui.terminal.UIService;
import com.ponysdk.ui.terminal.event.CommunicationErrorEvent;
import com.ponysdk.ui.terminal.instruction.PTInstruction;
public class PTScheduler extends AbstractPTObject implements CommunicationErrorEvent.Handler {
private final Map<Long, SchedulerCommand> commandByIDs = new HashMap<Long, PTScheduler.SchedulerCommand>();
private boolean hasCommunicationError = false;
public PTScheduler() {
UIBuilder.getRootEventBus().addHandler(CommunicationErrorEvent.TYPE, this);
}
@Override
public void create(final PTInstruction create, final UIService uiService) {}
@Override
public void update(final PTInstruction update, final UIService uiService) {
final long commandID = update.getLong(PROPERTY.COMMAND_ID);
if (update.containsKey(PROPERTY.STOP)) {
// Stop the command
commandByIDs.remove(commandID).cancel();
} else if (update.containsKey(PROPERTY.FIXDELAY)) {
// Fix-delay
// Wait for execution terminated before scheduling again
final SchedulerCommand previousCmd = commandByIDs.remove(commandID);
if (previousCmd != null) previousCmd.cancel();
final int delay = update.getInt(PROPERTY.FIXDELAY);
final FixDelayCommand command = new FixDelayCommand(uiService, update.getObjectID(), commandID, delay);
Scheduler.get().scheduleFixedDelay(command, delay);
commandByIDs.put(commandID, command);
} else if (update.containsKey(PROPERTY.FIXRATE)) {
// Fix-rate
final SchedulerCommand previousCmd = commandByIDs.remove(commandID);
if (previousCmd != null) previousCmd.cancel();
final int delay = update.getInt(PROPERTY.FIXRATE);
final FixRateCommand command = new FixRateCommand(uiService, update.getObjectID(), commandID, delay);
Scheduler.get().scheduleFixedDelay(command, delay);
commandByIDs.put(commandID, command);
}
}
@Override
public void gc(final UIService uiService) {
for (final SchedulerCommand command : commandByIDs.values()) {
command.cancel();
}
commandByIDs.clear();
}
protected abstract class SchedulerCommand implements RepeatingCommand {
protected final UIService uiService;
protected final long schedulerID;
protected final long commandID;
protected final int delay;
protected boolean cancelled = false;
public SchedulerCommand(final UIService uiService, final long schedulerID, final long commandID, final int delay) {
this.uiService = uiService;
this.schedulerID = schedulerID;
this.commandID = commandID;
this.delay = delay;
}
public void cancel() {
cancelled = true;
}
}
protected class FixRateCommand extends SchedulerCommand {
public FixRateCommand(final UIService uiService, final long schedulerID, final long commandID, final int delay) {
super(uiService, schedulerID, commandID, delay);
}
@Override
public boolean execute() {
if (cancelled) return false;
final PTInstruction instruction = new PTInstruction();
instruction.setObjectID(schedulerID);
instruction.put(TYPE.KEY, TYPE.KEY_.EVENT);
instruction.put(HANDLER.KEY, HANDLER.KEY_.SCHEDULER);
instruction.put(PROPERTY.ID, commandID);
instruction.put(PROPERTY.FIXRATE, delay);
uiService.sendDataToServer(instruction);
return !hasCommunicationError;
}
}
protected class FixDelayCommand extends SchedulerCommand {
public FixDelayCommand(final UIService uiService, final long schedulerID, final long commandID, final int delay) {
super(uiService, schedulerID, commandID, delay);
}
@Override
public boolean execute() {
if (cancelled) return false;
final PTInstruction instruction = new PTInstruction();
instruction.setObjectID(schedulerID);
instruction.put(TYPE.KEY, TYPE.KEY_.EVENT);
instruction.put(HANDLER.KEY, HANDLER.KEY_.SCHEDULER);
instruction.put(PROPERTY.ID, commandID);
instruction.put(PROPERTY.FIXDELAY, delay);
uiService.sendDataToServer(instruction);
return false;
}
}
@Override
public void onCommunicationError(final CommunicationErrorEvent event) {
hasCommunicationError = true;
}
}