/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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.google.walkaround.wave.client;
import com.google.walkaround.slob.shared.MessageException;
import com.google.walkaround.wave.client.rpc.Rpc;
import com.google.walkaround.wave.client.rpc.Rpc.ConnectionState;
import com.google.walkaround.wave.client.rpc.Rpc.Method;
import com.google.walkaround.wave.client.rpc.Rpc.RpcCallback;
import org.waveprotocol.wave.client.scheduler.Scheduler.IncrementalTask;
import org.waveprotocol.wave.model.util.CollectionUtils;
/**
* @author danilatos@google.com (Daniel Danilatos)
*/
public class VersionChecker implements IncrementalTask {
private final Rpc rpc;
private final int thisClientVersion;
public VersionChecker(Rpc rpc, int thisClientVersion) {
this.rpc = rpc;
this.thisClientVersion = thisClientVersion;
}
@Override
public boolean execute() {
rpc.makeRequest(Method.GET, "version",
CollectionUtils.newStringMap("version", "" + thisClientVersion),
new RpcCallback() {
@Override
public void onSuccess(String data) throws MessageException {
int requiredClientVersion;
try {
requiredClientVersion = Integer.parseInt(data);
} catch (NumberFormatException nfe) {
throw new MessageException(nfe);
}
if (requiredClientVersion != thisClientVersion) {
// TODO(danilatos): Automatically refresh (after a random delay),
// if there's no unsaved data.
rpc.maybeSetConnectionState(ConnectionState.HARD_RELOAD);
}
}
@Override
public void onConnectionError(Throwable e) {
// do nothing
// TODO(danilatos): Back off
}
@Override
public void onFatalError(Throwable e) {
// do nothing
// TODO(danilatos): Back off
}
});
return true;
}
}