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/**
* Copyright 2012 Kjetil Ørbekk <kjetil.orbekk@gmail.com>
*
* 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.orbekk.same;
import java.io.IOException;
import java.util.ArrayList;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.orbekk.same.State.Component;
import com.orbekk.util.DelayedOperation;
/**
* TODO: Use WeakReference in order to make variables GC-able.
*/
public class VariableFactory {
private Logger logger = LoggerFactory.getLogger(getClass());
private ClientInterface client;
private ObjectMapper mapper = new ObjectMapper();
private class VariableImpl<T> implements Variable<T>, StateChangedListener {
String identifier;
TypeReference<T> type;
T value;
long revision = 0;
ArrayList<OnChangeListener<T>> listeners =
new ArrayList<OnChangeListener<T>>();
public VariableImpl(String identifier, TypeReference<T> type) {
this.identifier = identifier;
this.type = type;
}
@Override
public T get() {
return value;
}
@Override
public DelayedOperation set(T value) {
try {
String serializedValue = mapper.writeValueAsString(value);
State.Component update = new State.Component(identifier,
revision, serializedValue);
return client.set(update);
} catch (JsonGenerationException e) {
logger.warn("Failed to convert to JSON: {}", value);
logger.warn("Parse exception.", e);
throw new RuntimeException(e);
} catch (JsonMappingException e) {
logger.warn("Failed to convert to JSON: {}", value);
logger.warn("Parse exception.", e);
throw new RuntimeException(e);
} catch (IOException e) {
logger.warn("Failed to cornvert to JSON: {}", value);
logger.warn("Parse exception.", e);
throw new RuntimeException(e);
}
}
@Override
public void update() {
value = client.getState().getParsedData(identifier, type);
revision = client.getState().getRevision(identifier);
}
@Override
public synchronized void addOnChangeListener(OnChangeListener<T> listener) {
listeners.add(listener);
}
@Override
public synchronized void removeOnChangeListener(OnChangeListener<T> listener) {
listeners.remove(listener);
}
@Override
public synchronized void stateChanged(Component component) {
if (component.getName().equals(identifier)) {
for (OnChangeListener<T> listener : listeners) {
listener.valueChanged(this);
}
}
}
}
public static VariableFactory create(ClientInterface client) {
return new VariableFactory(client);
}
VariableFactory(ClientInterface client) {
this.client = client;
}
public <T> Variable<T> create(String identifier, TypeReference<T> type) {
VariableImpl<T> variable = new VariableImpl<T>(identifier, type);
variable.update();
client.addStateListener(variable);
return variable;
}
public Variable<String> createString(String identifier) {
return create(identifier, new TypeReference<String>() {});
}
}
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