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package com.orbekk.same;
import java.io.IOException;
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;
/**
* 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;
OnChangeListener<T> listener = null;
public VariableImpl(String identifier, TypeReference<T> type) {
this.identifier = identifier;
this.type = type;
}
@Override
public T get() {
return value;
}
@Override
public void set(T value) throws UpdateConflict {
try {
String serializedValue = mapper.writeValueAsString(value);
client.set(identifier, serializedValue, revision);
} 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 void setOnChangeListener(OnChangeListener<T> listener) {
this.listener = listener;
}
@Override
public void stateChanged(Component component) {
if (component.getName().equals(identifier)) {
if (listener != null) {
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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