Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
package org.yamcs.parameter;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yamcs.InvalidIdentification;
import org.yamcs.InvalidRequestIdentification;
import org.yamcs.NoPermissionException;
import org.yamcs.protobuf.Pvalue.AcquisitionStatus;
import org.yamcs.protobuf.Yamcs.NamedObjectId;
import org.yamcs.security.ObjectPrivilegeType;
import org.yamcs.security.User;
import org.yamcs.utils.AggregateUtil;
import org.yamcs.utils.StringConverter;
import org.yamcs.xtce.Parameter;
import org.yamcs.xtce.PathElement;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
/**
* This sits in front of the ParameterRequestManager and implements subscriptions based on NamedObjectId taking care to
* send to the consumers the parameters with the requested id.
*
* A client can request in fact the same parameter with two different names and they will get it twice each time.
*
* In addition it can also provide updates on parameter expirations.
*
* TODO: impose some subscription limits
*
* @author nm
*
*/
public class ParameterWithIdRequestHelper implements ParameterConsumer {
ParameterRequestManager prm;
final ParameterWithIdConsumer listener;
static Logger log = LoggerFactory.getLogger(ParameterWithIdRequestHelper.class.getName());
Map subscriptions = new ConcurrentHashMap<>();
// how often to check expiration
private static long CHECK_EXPIRATION_INTERVAL = 1000;
final static ScheduledThreadPoolExecutor timer = new ScheduledThreadPoolExecutor(1);
int subscribeAllId = -1;
public ParameterWithIdRequestHelper(ParameterRequestManager prm, ParameterWithIdConsumer listener) {
this.prm = prm;
this.listener = listener;
schedulePeriodicExpirationChecking(this);
}
public int addRequest(List idList, User user)
throws InvalidIdentification, NoPermissionException {
return addRequest(idList, false, user);
}
public int addRequest(List idList, boolean checkExpiration, User user)
throws InvalidIdentification, NoPermissionException {
List plist = checkNames(idList);
Subscription subscr = new Subscription(checkExpiration);
for (int i = 0; i < idList.size(); i++) {
checkParameterPrivilege(user, plist.get(i).p.getQualifiedName());
subscr.add(plist.get(i));
}
int subscriptionId = prm.addRequest(plist.stream().map(pwid -> pwid.p).collect(Collectors.toList()), this);
subscriptions.put(subscriptionId, subscr);
return subscriptionId;
}
public void addItemsToRequest(int subscriptionId, List idList, User user)
throws InvalidIdentification, NoPermissionException {
Subscription subscr = subscriptions.get(subscriptionId);
if (subscr == null) {
log.warn("add item requested for an invalid subscription id {}", subscriptionId);
throw new InvalidRequestIdentification("Invalid subcription id", subscriptionId);
}
List plist = checkNames(idList);
synchronized (subscr) {
for (int i = 0; i < idList.size(); i++) {
Parameter p = plist.get(i).p;
checkParameterPrivilege(user, p.getQualifiedName());
NamedObjectId id = idList.get(i);
if (!subscr.add(plist.get(i))) {
log.info("Ignoring duplicate subscription for '{}', id: {}", p.getName(),
StringConverter.idToString(id));
}
}
}
prm.addItemsToRequest(subscriptionId, plist.stream().map(pwid -> pwid.p).collect(Collectors.toList()));
}
private static void schedulePeriodicExpirationChecking(ParameterWithIdRequestHelper x) {
// trick to allow GC to collect this object and remove it from the timer
final WeakReference ref = new WeakReference<>(x);
final AtomicReference> futureRef = new AtomicReference<>();
ScheduledFuture future = timer.scheduleAtFixedRate(() -> {
ParameterWithIdRequestHelper pwirh = ref.get();
if (pwirh == null) {
ScheduledFuture f = futureRef.get();
f.cancel(false);
} else {
pwirh.checkPeriodicExpiration();
}
}, CHECK_EXPIRATION_INTERVAL, CHECK_EXPIRATION_INTERVAL, TimeUnit.MILLISECONDS);
futureRef.set(future);
}
List checkNames(List idList) throws InvalidIdentification {
return checkNames(prm, idList);
}
// turn NamedObjectId to Parameter references
public static ParameterWithId checkName(ParameterRequestManager prm, NamedObjectId id)
throws InvalidIdentification {
String name = id.getName();
int x = AggregateUtil.findSeparator(name);
NamedObjectId id1;
PathElement[] path;
if (x > 0) { // this is an array or aggregate element
id1 = NamedObjectId.newBuilder(id).setName(name.substring(0, x)).build();
try {
path = AggregateUtil.parseReference(name.substring(x));
} catch (IllegalArgumentException e) {
throw new InvalidIdentification(id);
}
} else {
id1 = id;
path = null;
}
Parameter p = prm.getParameter(id1);
if (path != null) {
if (!AggregateUtil.verifyPath(p.getParameterType(), path)) {
throw new InvalidIdentification(id);
}
}
return new ParameterWithId(p, id, path);
}
// turn NamedObjectId to Parameter references
public static List checkNames(ParameterRequestManager prm, List idList)
throws InvalidIdentification {
List result = new ArrayList<>();
List invalid = new ArrayList<>(0);
for (NamedObjectId id : idList) {
try {
result.add(checkName(prm, id));
} catch (InvalidIdentification e) {
invalid.add(id);
continue;
}
}
if (!invalid.isEmpty()) {
log.info("Throwing invalid identification for the following items: {}", invalid);
throw new InvalidIdentification(invalid);
}
return result;
}
public void removeRequest(int subscriptionId) {
if (subscriptions.remove(subscriptionId) == null) {
log.warn("remove requested for an invalid subscription id {}", subscriptionId);
return;
}
prm.removeRequest(subscriptionId);
}
public void removeItemsFromRequest(int subscriptionId, List parameterIds, User user)
throws NoPermissionException {
Subscription subscr = subscriptions.get(subscriptionId);
if (subscr == null) {
log.warn("remove requested for an invalid subscription id {}", subscriptionId);
return;
}
List paramsToRemove = new ArrayList<>();
synchronized (subscr) {
for (NamedObjectId id : parameterIds) {
Parameter p = subscr.remove(id);
if (p != null) {
paramsToRemove.add(p);
}
}
}
if (!paramsToRemove.isEmpty()) {
prm.removeItemsFromRequest(subscriptionId, paramsToRemove);
}
}
public ParameterRequestManager getPrm() {
return prm;
}
public int subscribeAll(User user) throws NoPermissionException {
checkParameterPrivilege(user, ".*");
subscribeAllId = prm.subscribeAll(this);
return subscribeAllId;
}
/**
* retrieve the subscribed values from cache
*
* @param subscriptionId
* @return
*/
public List getValuesFromCache(int subscriptionId) {
Subscription subscr = subscriptions.get(subscriptionId);
if (subscr == null) {
log.warn("add item requested for an invalid subscription id {}", subscriptionId);
throw new InvalidRequestIdentification("Invalid subcription id", subscriptionId);
}
long now = prm.processor.getCurrentTime();
List values = prm.getValuesFromCache(subscr.params.keySet());
List pvlist = new ArrayList<>(values.size());
for (ParameterValue pv : values) {
if (pv.isExpired(now)) {
pv = new ParameterValue(pv);
pv.setAcquisitionStatus(AcquisitionStatus.EXPIRED);
}
if (subscr.checkExpiration && pv.hasExpirationTime()) {
subscr.pvexp.put(pv.getParameter(), pv);
}
List l = subscr.params.get(pv.getParameter());
if (l == null) {
log.warn("Received values for a parameter not requested: {}", pv.getParameter());
continue;
}
addValueForAllIds(pvlist, l, pv);
}
return pvlist;
}
/**
* Retrieve a list of parameter values from cache. This call does not block.
*
* @param idList
* @param user
* @return
* @throws InvalidIdentification
* @throws NoPermissionException
*/
public List getValuesFromCache(List idList, User user)
throws InvalidIdentification, NoPermissionException {
List plist = checkNames(idList);
ListMultimap lm = ArrayListMultimap.create();
for (int i = 0; i < idList.size(); i++) {
ParameterWithId pwid = plist.get(i);
checkParameterPrivilege(user, pwid.p.getQualifiedName());
lm.put(pwid.p, pwid);
}
List values = prm
.getValuesFromCache(plist.stream().map(pwid -> pwid.p).distinct().collect(Collectors.toList()));
List pvlist = new ArrayList<>(values.size());
for (ParameterValue pv : values) {
List l = lm.get(pv.getParameter());
if (l == null) {
log.warn("Received values for a parameter not requested: {}", pv.getParameter());
continue;
}
addValueForAllIds(pvlist, l, pv);
}
return pvlist;
}
// adds the pv into plist with all ids from idList
private void addValueForAllIds(List plist, List idList, ParameterValue pv) {
for (ParameterWithId pwid : idList) {
ParameterValue pv1 = null;
if (pwid.path != null) {
try {
pv1 = AggregateUtil.extractMember(pv, pwid.path);
if (pv1 == null) { // could be that we reference an element of an array that doesn't exist
continue;
}
} catch (Exception e) {
log.error("Failed to extract {} from parameter value {}", Arrays.toString(pwid.path), pv, e);
continue;
}
} else {
pv1 = pv;
}
ParameterValueWithId pvwi = new ParameterValueWithId(pv1, pwid.id);
plist.add(pvwi);
}
}
/**
* Called from {@link ParameterRequestManager when new parameters are available to be sent to clients}
*/
@Override
public void updateItems(int subscriptionId, List items) {
if (subscriptionId == subscribeAllId) {
updateAllSubscription(subscriptionId, items);
return;
}
Subscription subscription = subscriptions.get(subscriptionId);
if (subscription == null) { // probably the subscription has just been removed
log.debug("Received an updateItems for an unknown subscription {}", subscriptionId);
return;
}
List plist = new ArrayList<>(items.size());
synchronized (subscription) {
if (subscription.checkExpiration) {
long now = getAquisitionTime(items);
List expired = updateAndCheckExpiration(subscription, items, now);
if (!expired.isEmpty()) {
log.debug("Updating {} parameters due to expiration", expired.size());
listener.update(subscriptionId, expired);
}
}
for (ParameterValue pv : items) {
addValueForAllSubscribedIds(plist, subscription, pv);
}
}
listener.update(subscriptionId, plist);
}
private void updateAllSubscription(int subscriptionId, List items) {
List plist = new ArrayList<>(items.size());
for (ParameterValue pv : items) {
plist.add(new ParameterValueWithId(pv,
NamedObjectId.newBuilder().setName(pv.getParameterQualifiedName()).build()));
}
listener.update(subscriptionId, plist);
}
public void unselectPrm() {
for (int subscriptionId : subscriptions.keySet()) {
prm.removeRequest(subscriptionId);
}
prm = null;
}
public List selectPrm(ParameterRequestManager prm, User user) throws NoPermissionException {
List invalid = new ArrayList<>();
// Parameter references may be invalid for the new processor
// we have to re-create the subscriptions starting from the original subscribed names
// and take care that some names may have become invalid
this.prm = prm;
for (int subscriptionId : subscriptions.keySet()) {
Subscription subscr = subscriptions.get(subscriptionId);
synchronized (subscr) {
List idList = subscr.getallIds();
List plist;
try {
plist = checkNames(idList);
} catch (InvalidIdentification e) {
log.warn("Got invalid identification when selecting parameters for processor {}: {}",
prm.processor.getName(), e.getInvalidParameters());
idList.removeAll(e.getInvalidParameters());
invalid.addAll(e.getInvalidParameters());
try {
plist = checkNames(idList);
} catch (InvalidIdentification e1) { // shouldn't happen again
throw new IllegalStateException(e1);
}
}
assert (idList.size() == plist.size());
Subscription subscr1 = new Subscription(subscr.checkExpiration);
for (int i = 0; i < plist.size(); i++) {
ParameterWithId pwid = plist.get(i);
checkParameterPrivilege(user, pwid.p.getQualifiedName());
subscr1.add(pwid);
}
prm.addRequest(subscriptionId, plist.stream().map(pwid -> pwid.p).collect(Collectors.toList()), this);
subscriptions.put(subscriptionId, subscr1);
}
}
return invalid;
}
/**
* Change processor and return the list of parameters that were valid in the old processor and are not anymore
*/
public List switchPrm(ParameterRequestManager newPrm, User user) throws NoPermissionException {
if (prm != null) {
unselectPrm();
}
if (newPrm != null) {
return selectPrm(newPrm, user);
} else {
return Collections.emptyList();
}
}
private long getAquisitionTime(List items) {
for (ParameterValue pv : items) {
if (pv.hasAcquisitionTime()) {
return pv.getAcquisitionTime();
}
}
return prm.processor.getCurrentTime();
}
// adds the pv into plist with all ids subscribed
private void addValueForAllSubscribedIds(List plist, Subscription subscription,
ParameterValue pv) {
Parameter p = pv.getParameter();
List idList = subscription.get(p);
if (idList == null || idList.isEmpty()) {
log.warn("Received values for a parameter not subscribed: {}", pv.getParameter());
return;
}
addValueForAllIds(plist, idList, pv);
}
private void checkPeriodicExpiration() {
for (Map.Entry me : subscriptions.entrySet()) {
Subscription subscription = me.getValue();
synchronized (subscription) {
long now = prm.processor.getCurrentTime();
if ((subscription.checkExpiration)
&& (now - subscription.lastExpirationCheck > CHECK_EXPIRATION_INTERVAL)) {
List expired = checkExpiration(subscription, now);
if (!expired.isEmpty()) {
log.debug("Updating {} parameters due to expiration", expired.size());
listener.update(me.getKey(), expired);
}
}
}
}
}
// update the expiration list with new values and check expiration of parameters that are just updating
// in case the expiration is shorter than the check interval - this method would detect and send the parameters that
// have just expired
private List updateAndCheckExpiration(Subscription subscription, List items,
long now) {
List expired = new ArrayList<>();
for (ParameterValue pv : items) {
Parameter p = pv.getParameter();
ParameterValue oldPv;
if (pv.hasExpirationTime()) {
oldPv = subscription.pvexp.put(p, pv);
} else {
oldPv = subscription.pvexp.remove(p);
}
if ((oldPv != null) && oldPv.getAcquisitionStatus() == AcquisitionStatus.ACQUIRED && oldPv.isExpired(now)) {
ParameterValue tmp = new ParameterValue(oldPv); // make a copy because this is shared by other
// subscribers
tmp.setAcquisitionStatus(AcquisitionStatus.EXPIRED);
addValueForAllSubscribedIds(expired, subscription, tmp);
}
}
return expired;
}
// check expiration of all parameters from subscription
private List checkExpiration(Subscription subscription, long now) {
List expired = new ArrayList<>();
for (ParameterValue pv : subscription.pvexp.values()) {
if (pv.getAcquisitionStatus() == AcquisitionStatus.ACQUIRED && pv.isExpired(now)) {
ParameterValue tmp = new ParameterValue(pv); // make a copy because this is shared by other subscribers
tmp.setAcquisitionStatus(AcquisitionStatus.EXPIRED);
subscription.pvexp.put(pv.getParameter(), tmp);
addValueForAllSubscribedIds(expired, subscription, tmp);
}
}
subscription.lastExpirationCheck = now;
return expired;
}
/**
* Check if the user has a privilege for the specified parameter name
*
* @param authToken
* @param parameterName
* @throws NoPermissionException
*/
private void checkParameterPrivilege(User user, String parameterName)
throws NoPermissionException {
if (!user.hasObjectPrivilege(ObjectPrivilegeType.ReadParameter, parameterName)) {
throw new NoPermissionException("User " + user + " has no permission for parameter " + parameterName);
}
}
public void quit() {
for (int subscriptionId : subscriptions.keySet()) {
prm.removeRequest(subscriptionId);
}
subscriptions.clear();
if (subscribeAllId != -1) {
prm.unsubscribeAll(subscribeAllId);
}
}
static class Subscription {
Map> params = new LinkedHashMap<>();
boolean checkExpiration = false;
long lastExpirationCheck = -1;
// contains the parameters that have an expiration time set
Map pvexp;
public Subscription(boolean checkExpiration) {
this.checkExpiration = checkExpiration;
if (checkExpiration) {
pvexp = new HashMap<>();
}
}
public List getallIds() {
List r = new ArrayList<>();
for (List l : params.values()) {
for (ParameterWithId pwid : l) {
r.add(pwid.id);
}
}
return r;
}
/**
* looks and removes the id from a list and returns the associated parameter if there is no id mapped to it
* anymore otherwise return null
*
* @param id
* @return
*/
public Parameter remove(NamedObjectId id) {
Parameter p = null;
boolean found = false;
for (Map.Entry> me : params.entrySet()) {
List l = me.getValue();
for (ParameterWithId pwid : l) {
if (pwid.id.equals(id)) {
l.remove(pwid);
found = true;
break;
}
}
if (found) {
if (l.isEmpty()) {
p = me.getKey();
}
break;
}
}
if (p != null) {
params.remove(p);
if (pvexp != null) {
pvexp.remove(p);
}
}
return p;
}
public List get(Parameter parameter) {
return params.get(parameter);
}
public boolean add(ParameterWithId pwid) {
List l = params.get(pwid.p);
if (l == null) {
l = new ArrayList<>();
params.put(pwid.p, l);
} else if (l.stream().anyMatch(pwid1 -> pwid1.id.equals(pwid.id))) {
return false;
}
l.add(pwid);
return true;
}
}
}
