/*
* (non-Javadoc)
*
* @see
* org.eclipse.smarthome.core.service.AbstractWatchService#getSourcePath()
*/
@Override
protected String getSourcePath() {
String progArg = System.getProperty(SERVICEDIR_PROG_ARGUMENT);
if (progArg != null) {
return ConfigConstants.getConfigFolder() + File.separator + progArg;
} else {
return ConfigConstants.getConfigFolder() + File.separator + SERVICES_FOLDER;
}
}
private String getDefaultServiceConfigFile() {
String progArg = System.getProperty(SERVICECFG_PROG_ARGUMENT);
if (progArg != null) {
return progArg;
} else {
return ConfigConstants.getConfigFolder() + File.separator + SERVICE_CFG_FILE;
}
}
/**
* handles requests for chart series data from the CometVisu client used by the diagram plugin
*
* @author Tobias Bräutigam
* @since 2.0.0
*/
@Path(Config.COMETVISU_BACKEND_ALIAS + "/" + Config.COMETVISU_BACKEND_CHART_ALIAS)
public class ChartResource implements RESTResource {
private static final Logger logger = LoggerFactory.getLogger(ChartResource.class);
// pattern RRDTool uses to format doubles in XML files
static final String PATTERN = "0.0000000000E00";
static final DecimalFormat df;
protected static final String RRD_FOLDER =
org.eclipse.smarthome.config.core.ConfigConstants.getUserDataFolder()
+ File.separator
+ "persistence"
+ File.separator
+ "rrd4j";
static {
df = (DecimalFormat) NumberFormat.getNumberInstance(Locale.ENGLISH);
df.applyPattern(PATTERN);
// df.setPositivePrefix("+");
}
protected static Map<String, QueryablePersistenceService> persistenceServices =
new HashMap<String, QueryablePersistenceService>();
private ItemRegistry itemRegistry;
@Context private UriInfo uriInfo;
public void addPersistenceService(PersistenceService service) {
if (service instanceof QueryablePersistenceService) {
persistenceServices.put(service.getId(), (QueryablePersistenceService) service);
}
}
public void removePersistenceService(PersistenceService service) {
persistenceServices.remove(service.getId());
}
public static Map<String, QueryablePersistenceService> getPersistenceServices() {
return persistenceServices;
}
protected void setItemRegistry(ItemRegistry itemRegistry) {
this.itemRegistry = itemRegistry;
}
protected void unsetItemRegistry(ItemRegistry itemRegistry) {
this.itemRegistry = null;
}
@GET
@Produces({MediaType.APPLICATION_JSON})
public Response getChartSeries(
@Context HttpHeaders headers,
@QueryParam("rrd") String itemName,
@QueryParam("ds") String consFunction,
@QueryParam("start") String start,
@QueryParam("end") String end,
@QueryParam("res") long resolution) {
if (logger.isDebugEnabled()) {
logger.debug("Received GET request at '{}' for rrd '{}'.", uriInfo.getPath(), itemName);
}
String responseType = MediaType.APPLICATION_JSON;
// RRD specific: no equivalent in PersistenceService known
ConsolFun consilidationFunction = ConsolFun.valueOf(consFunction);
// read the start/end time as they are provided in the RRD-way, we use
// the RRD4j to read them
long[] times = Util.getTimestamps(start, end);
Date startTime = new Date();
startTime.setTime(times[0] * 1000L);
Date endTime = new Date();
endTime.setTime(times[1] * 1000L);
if (itemName.endsWith(".rrd")) {
itemName = itemName.substring(0, itemName.length() - 4);
}
String[] parts = itemName.split(":");
String service = "rrd4j";
if (parts.length == 2) {
itemName = parts[1];
service = parts[0];
}
Item item;
try {
item = itemRegistry.getItem(itemName);
logger.debug("item '{}' found ", item);
// Prefer RRD-Service
QueryablePersistenceService persistenceService = getPersistenceServices().get(service);
// Fallback to first persistenceService from list
if (persistenceService == null) {
Iterator<Entry<String, QueryablePersistenceService>> pit =
getPersistenceServices().entrySet().iterator();
if (pit.hasNext()) {
persistenceService = pit.next().getValue();
} else {
throw new IllegalArgumentException("No Persistence service found.");
}
}
Object data = null;
if (persistenceService.getId().equals("rrd4j")) {
data =
getRrdSeries(
persistenceService, item, consilidationFunction, startTime, endTime, resolution);
} else {
data = getPersistenceSeries(persistenceService, item, startTime, endTime, resolution);
}
return Response.ok(data, responseType).build();
} catch (ItemNotFoundException e1) {
logger.error("Item '{}' not found error while requesting series data.", itemName);
}
return Response.serverError().build();
}
public Object getPersistenceSeries(
QueryablePersistenceService persistenceService,
Item item,
Date timeBegin,
Date timeEnd,
long resolution) {
Map<Long, ArrayList<String>> data = new HashMap<Long, ArrayList<String>>();
// Define the data filter
FilterCriteria filter = new FilterCriteria();
filter.setBeginDate(timeBegin);
filter.setEndDate(timeEnd);
filter.setItemName(item.getName());
filter.setOrdering(Ordering.ASCENDING);
// Get the data from the persistence store
Iterable<HistoricItem> result = persistenceService.query(filter);
Iterator<HistoricItem> it = result.iterator();
// Iterate through the data
int dataCounter = 0;
while (it.hasNext()) {
dataCounter++;
HistoricItem historicItem = it.next();
org.eclipse.smarthome.core.types.State state = historicItem.getState();
if (state instanceof DecimalType) {
ArrayList<String> vals = new ArrayList<String>();
vals.add(formatDouble(((DecimalType) state).doubleValue(), "null", true));
data.put(historicItem.getTimestamp().getTime(), vals);
}
}
logger.debug(
"'{}' querying item '{}' from '{}' to '{}' => '{}' results",
persistenceService.getId(),
filter.getItemName(),
filter.getBeginDate(),
filter.getEndDate(),
dataCounter);
return convertToRrd(data);
}
/**
* returns a rrd series data, an array of [[timestamp,data1,data2,...]]
*
* @param persistenceService
* @param item
* @param consilidationFunction
* @param timeBegin
* @param timeEnd
* @param resolution
* @return
*/
public Object getRrdSeries(
QueryablePersistenceService persistenceService,
Item item,
ConsolFun consilidationFunction,
Date timeBegin,
Date timeEnd,
long resolution) {
Map<Long, ArrayList<String>> data = new TreeMap<Long, ArrayList<String>>();
try {
List<String> itemNames = new ArrayList<String>();
if (item instanceof GroupItem) {
GroupItem groupItem = (GroupItem) item;
for (Item member : groupItem.getMembers()) {
itemNames.add(member.getName());
}
} else {
itemNames.add(item.getName());
}
for (String itemName : itemNames) {
addRrdData(data, itemName, consilidationFunction, timeBegin, timeEnd, resolution);
}
} catch (FileNotFoundException e) {
// rrd file does not exist, fallback to generic persistance service
logger.debug(
"no rrd file found '{}'", (RRD_FOLDER + File.separator + item.getName() + ".rrd"));
return getPersistenceSeries(persistenceService, item, timeBegin, timeEnd, resolution);
} catch (Exception e) {
logger.error(e.getLocalizedMessage() + ": fallback to generic persistance service");
return getPersistenceSeries(persistenceService, item, timeBegin, timeEnd, resolution);
}
return convertToRrd(data);
}
private ArrayList<Object> convertToRrd(Map<Long, ArrayList<String>> data) {
// sort data by key
Map<Long, ArrayList<String>> treeMap = new TreeMap<Long, ArrayList<String>>(data);
ArrayList<Object> rrd = new ArrayList<Object>();
for (Long time : treeMap.keySet()) {
Object[] entry = new Object[2];
entry[0] = time;
entry[1] = data.get(time);
rrd.add(entry);
}
return rrd;
}
private Map<Long, ArrayList<String>> addRrdData(
Map<Long, ArrayList<String>> data,
String itemName,
ConsolFun consilidationFunction,
Date timeBegin,
Date timeEnd,
long resolution)
throws IOException {
RrdDb rrdDb = new RrdDb(RRD_FOLDER + File.separator + itemName + ".rrd");
FetchRequest fetchRequest =
rrdDb.createFetchRequest(
consilidationFunction,
Util.getTimestamp(timeBegin),
Util.getTimestamp(timeEnd),
resolution);
FetchData fetchData = fetchRequest.fetchData();
// logger.info(fetchData.toString());
long[] timestamps = fetchData.getTimestamps();
double[][] values = fetchData.getValues();
logger.debug(
"RRD fetch returned '{}' rows and '{}' columns",
fetchData.getRowCount(),
fetchData.getColumnCount());
for (int row = 0; row < fetchData.getRowCount(); row++) {
// change to microseconds
long time = timestamps[row] * 1000;
if (!data.containsKey(time)) {
data.put(time, new ArrayList<String>());
}
ArrayList<String> vals = data.get(time);
int indexOffset = vals.size();
for (int dsIndex = 0; dsIndex < fetchData.getColumnCount(); dsIndex++) {
vals.add(dsIndex + indexOffset, formatDouble(values[dsIndex][row], "null", true));
}
}
rrdDb.close();
return data;
}
static String formatDouble(double x, String nanString, boolean forceExponents) {
if (Double.isNaN(x)) {
return nanString;
}
if (forceExponents) {
return df.format(x);
}
return "" + x;
}
}
