@Override
public String toString() {
// serialise message to JSON and return final message string data
try {
final StringBuilderWriter buffer = new StringBuilderWriter(512);
final JSONWriter writer = new JSONWriter(buffer);
writer.startObject();
writer.writeValue(ClusterMessage.JSON_SENDER, getSender());
writer.startValue(ClusterMessage.JSON_MESSAGE);
writer.startObject();
writer.writeValue(ClusterMessage.JSON_TYPE, getType());
writer.startValue(ClusterMessage.JSON_PAYLOAD);
serialiseMessageObjects(writer, null, this.payload);
writer.endValue();
writer.endObject();
writer.endValue();
writer.endObject();
return buffer.toString();
} catch (IOException e) {
throw new IllegalStateException("Unable to output cluster message: " + e.getMessage(), e);
}
}
/**
* Recursively serialise objects to a JSONWriter.
*
* <p>Handles basic Java type suitable for the current messaging implementation.
*
* @param writer JSONWriter for output
* @param name Name of the current value, can be null for array item
* @param obj Object representing the value to serialise
*/
static void serialiseMessageObjects(
final JSONWriter writer, final String name, final Serializable obj) throws IOException {
if (obj instanceof Map) {
// recursively serialise the map entries
if (name != null) {
writer.startValue(name);
}
writer.startObject();
Map<String, Serializable> map = (Map<String, Serializable>) obj;
for (final String key : map.keySet()) {
serialiseMessageObjects(writer, key, map.get(key));
}
writer.endObject();
if (name != null) {
writer.endValue();
}
} else if (obj instanceof List) {
// recursively serialise the list items
if (name != null) {
writer.startValue(name);
}
writer.startArray();
for (final Object item : (List) obj) {
serialiseMessageObjects(writer, null, (Serializable) item);
}
writer.endArray();
if (name != null) {
writer.endValue();
}
} else if (obj instanceof Integer) {
if (name != null) {
writer.writeValue(name, (Integer) obj);
} else {
writer.writeValue((Integer) obj);
}
} else if (obj instanceof Boolean) {
if (name != null) {
writer.writeValue(name, (Boolean) obj);
} else {
writer.writeValue((Boolean) obj);
}
} else if (obj instanceof Date) {
if (name != null) {
writer.writeValue(name, ISO8601DateFormat.format((Date) obj));
} else {
writer.writeValue(ISO8601DateFormat.format((Date) obj));
}
} else if (obj == null) {
if (name != null) {
writer.writeNullValue(name);
} else {
writer.writeNullValue();
}
} else {
if (name != null) {
writer.writeValue(name, obj.toString());
} else {
writer.writeValue(obj.toString());
}
}
}