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package com.orbekk.same;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.TreeSet;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
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;
/**
* This class is thread-safe.
*/
public class State {
private Logger logger = LoggerFactory.getLogger(getClass());
private Map<String, Component> state = new HashMap<String, Component>();
private ObjectMapper mapper = new ObjectMapper();
private Set<String> updatedComponents = new TreeSet<String>();
public State(String networkName) {
update(".networkName", networkName, 0);
updateFromObject(".participants", new ArrayList<String>(), 0);
}
public boolean update(String componentName, String data, long revision) {
Component component = null;
if (!state.containsKey(componentName)) {
component = new Component(0, "");
} else {
component = state.get(componentName);
}
if (revision == component.getRevision()) {
component.setRevision(revision + 1);
component.setData(data);
state.put(componentName, component);
updatedComponents.add(componentName);
return true;
} else {
return false;
}
}
public String getDataOf(String componentName) {
Component component = state.get(componentName);
if (component != null) {
return component.getData();
} else {
return null;
}
}
public long getRevision(String componentName) {
Component component = state.get(componentName);
if (component != null) {
return component.getRevision();
} else {
logger.warn("getRevision: Unknown component {}. Returning 0",
componentName);
return 0;
}
}
/**
* Parses a JSON value using Jackson ObjectMapper.
*/
public <T> T getParsedData(String componentName, TypeReference<T> type) {
String data = getDataOf(componentName);
if (data != null) {
try {
return mapper.readValue(data, type);
} catch (JsonParseException e) {
logger.warn("Failed to parse value {} ", data);
logger.warn("Parse exception: {}", e);
} catch (JsonMappingException e) {
logger.warn("Failed to parse value {} ", data);
logger.warn("Parse exception: {}", e);
} catch (IOException e) {
logger.warn("Failed to parse value {} ", data);
logger.warn("Parse exception: {}", e);
}
}
return null;
}
public List<String> getList(String componentName) {
return getParsedData(componentName,
new TypeReference<List<String>>(){});
}
public boolean updateFromObject(String componentName, Object data, long revision) {
String dataS;
try {
dataS = mapper.writeValueAsString(data);
return update(componentName, dataS, revision);
} catch (JsonGenerationException e) {
logger.warn("Failed to convert to JSON: {} ", data);
logger.warn("Parse exception: {}", e);
return false;
} catch (JsonMappingException e) {
logger.warn("Failed to convert to JSON: {} ", data);
logger.warn("Parse exception: {}", e);
return false;
} catch (IOException e) {
logger.warn("Failed to convert to JSON: {} ", data);
logger.warn("Parse exception: {}", e);
return false;
}
}
/**
* Pretty print a component.
*/
public String show(String componentName) {
return componentName + ": " + state.get(componentName);
}
public synchronized Set<String> getAndClearUpdatedComponents() {
Set<String> copy = new TreeSet<String>(updatedComponents);
updatedComponents.clear();
return copy;
}
public static class Component {
private long revision;
private String data;
public Component(long revision, String data) {
this.revision = revision;
this.data = data;
}
public long getRevision() {
return revision;
}
public void setRevision(long revision) {
this.revision = revision;
}
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
@Override public String toString() {
return this.data + " @" + revision;
}
}
//
// @Override
// public String toString() {
// StringBuilder participantsString = new StringBuilder();
// participantsString.append("[");
// boolean first = true;
// for (Map.Entry<String, String> e : participants.entrySet()) {
// if (!first) {
// participantsString.append(", ");
// }
// first = false;
// participantsString.append(e.getKey())
// .append("(")
// .append(e.getValue())
// .append(")");
// String clientId = e.getKey();
// String url = e.getValue();
// }
// participantsString.append("]");
//
// return String.format(
// "State( \n" +
// " stateIteration = %d,\n" +
// " networkName = %s,\n" +
// " masterId = %s,\n" +
// " data = %s,\n" +
// " participants = %s\n" +
// ")", stateIteration, networkName, masterId, data,
// participantsString);
// }
}
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