brooklyn.location.basic.BasicLocationRegistry Maven / Gradle / Ivy
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package brooklyn.location.basic;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.ServiceLoader;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import brooklyn.config.ConfigMap;
import brooklyn.config.ConfigPredicates;
import brooklyn.config.ConfigUtils;
import brooklyn.location.Location;
import brooklyn.location.LocationDefinition;
import brooklyn.location.LocationRegistry;
import brooklyn.location.LocationResolver;
import brooklyn.management.ManagementContext;
import brooklyn.util.collections.MutableMap;
import brooklyn.util.text.Identifiers;
import brooklyn.util.text.WildcardGlobs;
import brooklyn.util.text.WildcardGlobs.PhraseTreatment;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMap;
@SuppressWarnings({"rawtypes","unchecked"})
public class BasicLocationRegistry implements LocationRegistry {
public static final Logger log = LoggerFactory.getLogger(BasicLocationRegistry.class);
/**
* Splits a comma-separated list of locations (names or specs) into an explicit list.
* The splitting is very careful to handle commas embedded within specs, to split correctly.
*/
public static List expandCommaSeparateLocations(String locations) {
return WildcardGlobs.getGlobsAfterBraceExpansion("{"+locations+"}", false, PhraseTreatment.INTERIOR_NOT_EXPANDABLE, PhraseTreatment.INTERIOR_NOT_EXPANDABLE);
// don't do this, it tries to expand commas inside parentheses which is not good!
// QuotedStringTokenizer.builder().addDelimiterChars(",").buildList((String)id);
}
private final ManagementContext mgmt;
/** map of defined locations by their ID */
private final Map definedLocations = new LinkedHashMap();
protected final Map resolvers = new LinkedHashMap();
public BasicLocationRegistry(ManagementContext mgmt) {
this.mgmt = checkNotNull(mgmt, "mgmt");
findServices();
updateDefinedLocations();
}
protected void findServices() {
ServiceLoader loader = ServiceLoader.load(LocationResolver.class);
for (LocationResolver r: loader) {
r.init(mgmt);
resolvers.put(r.getPrefix(), r);
}
if (log.isDebugEnabled()) log.debug("Location resolvers are: "+resolvers);
if (resolvers.isEmpty()) log.warn("No location resolvers detected: is src/main/resources correctly included?");
}
@Override
public Map getDefinedLocations() {
synchronized (definedLocations) {
return ImmutableMap.copyOf(definedLocations);
}
}
@Deprecated
@Override
public LocationDefinition getDefinedLocation(String id) {
return getDefinedLocationById(id);
}
@Override
public LocationDefinition getDefinedLocationById(String id) {
return definedLocations.get(id);
}
@Override
public LocationDefinition getDefinedLocationByName(String name) {
synchronized (definedLocations) {
for (LocationDefinition l: definedLocations.values()) {
if (l.getName().equals(name)) return l;
}
return null;
}
}
@Override
public void updateDefinedLocation(LocationDefinition l) {
synchronized (definedLocations) {
definedLocations.put(l.getId(), l);
}
}
@Override
public void removeDefinedLocation(String id) {
synchronized (definedLocations) {
definedLocations.remove(id);
}
}
public void updateDefinedLocations() {
synchronized (definedLocations) {
// first read all properties starting brooklyn.location.named.xxx
// (would be nice to move to a better way, then deprecate this approach, but first
// we need ability/format for persisting named locations, and better support for adding+saving via REST/GUI)
int count = 0;
String NAMED_LOCATION_PREFIX = "brooklyn.location.named.";
ConfigMap namedLocationProps = mgmt.getConfig().submap(ConfigPredicates.startingWith(NAMED_LOCATION_PREFIX));
for (String k: namedLocationProps.asMapWithStringKeys().keySet()) {
String name = k.substring(NAMED_LOCATION_PREFIX.length());
// If has a dot, then is a sub-property of a named location (e.g. brooklyn.location.named.prod1.user=bob)
if (!name.contains(".")) {
// this is a new named location
String spec = (String) namedLocationProps.asMapWithStringKeys().get(k);
// make up an ID
String id = Identifiers.makeRandomId(8);
Map config = ConfigUtils.filterForPrefixAndStrip(namedLocationProps.asMapWithStringKeys(), k+".");
definedLocations.put(id, new BasicLocationDefinition(id, name, spec, config));
count++;
}
}
if (log.isDebugEnabled())
log.debug("Found "+count+" defined locations from properties (*.named.* syntax): "+definedLocations.values());
if (getDefinedLocationByName("localhost")==null && !BasicOsDetails.Factory.newLocalhostInstance().isWindows()) {
log.debug("Adding a defined location for localhost");
// add 'localhost' *first*
ImmutableMap oldDefined = ImmutableMap.copyOf(definedLocations);
definedLocations.clear();
String id = Identifiers.makeRandomId(8);
definedLocations.put(id, localhost(id));
definedLocations.putAll(oldDefined);
}
}
}
// TODO save / serialize
@VisibleForTesting
void disablePersistence() {
// persistence isn't enabled yet anyway (have to manually save things,
// defining the format and file etc)
}
BasicLocationDefinition localhost(String id) {
return new BasicLocationDefinition(id, "localhost", "localhost", null);
}
/** to catch circular references */
protected ThreadLocal> specsSeen = new ThreadLocal>();
@Override @Deprecated
public boolean canResolve(String spec) {
return canMaybeResolve(spec);
}
@Override
public boolean canMaybeResolve(String spec) {
return getSpecResolver(spec) != null;
}
@Override
public final Location resolve(String spec) {
return resolve(spec, new MutableMap());
}
@Override
public final Location resolveIfPossible(String spec) {
if (!canMaybeResolve(spec)) return null;
try {
return resolve(spec);
} catch (Exception e) {
if (log.isTraceEnabled())
log.trace("Unable to resolve "+spec+": "+e, e);
// can't resolve
return null;
}
}
@Override
public Location resolve(String spec, Map locationFlags) {
try {
Set seenSoFar = specsSeen.get();
if (seenSoFar==null) {
seenSoFar = new LinkedHashSet();
specsSeen.set(seenSoFar);
}
if (seenSoFar.contains(spec))
throw new IllegalStateException("Circular reference in definition of location '"+spec+"' ("+seenSoFar+")");
seenSoFar.add(spec);
LocationResolver resolver = getSpecResolver(spec);
if (resolver != null) {
return resolver.newLocationFromString(locationFlags, spec, this);
}
throw new NoSuchElementException("No resolver found for '"+spec+"'");
} finally {
specsSeen.remove();
}
}
protected LocationResolver getSpecResolver(String spec) {
int colon = spec.indexOf(':');
String prefix = colon>=0 ? spec.substring(0, colon) : spec;
LocationResolver resolver = resolvers.get(prefix);
if (resolver == null)
resolver = getSpecDefaultResolver(spec);
return resolver;
}
protected LocationResolver getSpecDefaultResolver(String spec) {
return getSpecFirstResolver(spec, "id", "named", "jclouds");
}
protected LocationResolver getSpecFirstResolver(String spec, String ...resolversToCheck) {
for (String resolverId: resolversToCheck) {
LocationResolver resolver = resolvers.get(resolverId);
if (resolver!=null && resolver.accepts(spec, this))
return resolver;
}
return null;
}
/** providers default impl for RegistryLocationResolver.accepts */
public static boolean isResolverPrefixForSpec(LocationResolver resolver, String spec, boolean argumentRequired) {
if (spec==null) return false;
if (spec.startsWith(resolver.getPrefix()+":")) return true;
if (!argumentRequired && spec.equals(resolver.getPrefix())) return true;
return false;
}
/** @deprecated since 0.5; use resolve */
public List getLocationsById(Iterable specs) {
return resolve(specs);
}
/**
* Expects a collection of strings being the spec for locations, returns a list of locations.
* Also allows single elements which are comma-separated lists of locations.
*
* For legacy compatibility this also accepts nested lists, but that is deprecated
* (and triggers a warning).
*/
@Override
public List resolve(Iterable spec) {
List result = new ArrayList();
for (Object id : spec) {
if (id instanceof String) {
// if it as comma-separated list -- TODO with no comma in the brackets
List l = expandCommaSeparateLocations((String)id);
if (l.size()>1) id = l;
} else if (id instanceof Iterable) {
log.warn("Deprecated use of LocationRegistry got list of list of location strings, "+spec+"; flattening");
}
if (id instanceof String) {
result.add(resolve((String) id));
} else if (id instanceof Iterable) {
result.addAll(resolve((Iterable) id));
} else if (id instanceof Location) {
result.add((Location) id);
} else {
throw new IllegalArgumentException("Cannot resolve '"+id+"' to a location; unsupported type "+
(id == null ? "null" : id.getClass().getName()));
}
}
return result;
}
@Override
public Location resolve(LocationDefinition ld) {
return resolveLocationDefinition(ld, Collections.emptyMap(), null);
}
public Location resolveLocationDefinition(LocationDefinition ld, Map locationFlags, String optionalName) {
MutableMap newLocationFlags = new MutableMap().add(locationFlags).add(ld.getConfig());
if (optionalName==null && ld.getName()!=null) optionalName = ld.getName();
if (optionalName!=null) newLocationFlags.add("named", optionalName);
try {
return resolve(ld.getSpec(), newLocationFlags);
} catch (Exception e) {
throw new IllegalStateException("Cannot instantiate named location '"+optionalName+"' pointing at "+ld.getSpec()+": "+e, e);
}
}
@Override
public Map getProperties() {
return mgmt.getConfig().asMapWithStringKeys();
}
@VisibleForTesting
public static void setupLocationRegistryForTesting(ManagementContext mgmt) {
// ensure localhost is added (even on windows)
LocationDefinition l = mgmt.getLocationRegistry().getDefinedLocationByName("localhost");
if (l==null) mgmt.getLocationRegistry().updateDefinedLocation(
((BasicLocationRegistry)mgmt.getLocationRegistry()).localhost(Identifiers.makeRandomId(8)));
((BasicLocationRegistry)mgmt.getLocationRegistry()).disablePersistence();
}
}