Java Map.computeIfAbsent方法代碼示例

import java.util.Map; //導入方法依賴的package包/類
protected Map<String, List<CacheEndpoint>> createTransportMap() {
  Map<String, List<CacheEndpoint>> transportMap = new HashMap<>();
  for (MicroserviceInstance instance : instanceMap.values()) {
    // 過濾到不可用實例
    if (instance.getStatus() != MicroserviceInstanceStatus.UP) {
      continue;
    }
    for (String endpoint : instance.getEndpoints()) {
      try {
        URI uri = URI.create(endpoint);
        String transportName = uri.getScheme();

        List<CacheEndpoint> cacheEndpointList = transportMap.computeIfAbsent(transportName, k -> new ArrayList<>());
        cacheEndpointList.add(new CacheEndpoint(endpoint, instance));
      } catch (Exception e) {
        LOGGER.warn("unrecognized address find, ignore " + endpoint);
      }
    }
  }
  return transportMap;
}
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * Sum collection of ResultAndUpdate into one: results are reduced by specified binary operator and updates are merged.
 *
 * @param reducer Reducer used to combine computation results.
 * @param resultsAndUpdates ResultAndUpdates to be combined with.
 * @param <R> Type of computation result.
 * @return Sum of collection ResultAndUpdate objects.
 */
@SuppressWarnings("unchecked")
static <R> ResultAndUpdates<R> sum(IgniteFunction<List<R>, R> reducer,
    Collection<ResultAndUpdates<R>> resultsAndUpdates) {
    Map<String, Map> allUpdates = new HashMap<>();

    for (ResultAndUpdates<R> ru : resultsAndUpdates) {
        for (String cacheName : ru.updates.keySet()) {
            allUpdates.computeIfAbsent(cacheName, s -> new HashMap());

            allUpdates.get(cacheName).putAll(ru.updates.get(cacheName));
        }
    }

    List<R> results = resultsAndUpdates.stream().map(ResultAndUpdates::result).collect(Collectors.toList());

    return new ResultAndUpdates<>(reducer.apply(results), allUpdates);
}
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * An unsafe version of {@link Map#computeIfAbsent(Object, Function) Map.computeIfAbsent} that may throw a checked
 * exception.
 *
 * @param map      the map to modify
 * @param key      the key to get
 * @param function the compute function
 * @param <K>      the type of keys in the map
 * @param <V>      the type of values in the map
 * @param <X>      the type of exception that the compute function may throw
 *
 * @return
 *
 * @throws X if the compute function threw an exception
 */
public static <K, V, X extends Throwable> V computeIfAbsent(
    Map<K, V> map, K key, ThrowingFunction<? super K, ? extends V, ? extends X> function) throws X {
  Throwable[] exception = {null};
  final Object none = new Object();
  V value = map.computeIfAbsent(key, k -> {
    try {
      return function.apply(k);
    } catch (Throwable e) {
      exception[0] = e;
      return (V) none;
    }
  });
  if (value == none) { // NOPMD reference equality check
    throw (X) exception[0];
  } else {
    return value;
  }
}
 

import java.util.Map; //導入方法依賴的package包/類
private String productNameForInvoiceItem(final InvoiceItem invoiceItem,
        final Map<String, String> planToProductCache, final UUID kbTenantId) {
    final String planName = invoiceItem.getPlanName();
    if (planName == null) {
        return null;
    }

    return planToProductCache.computeIfAbsent(planName, k -> {
        try {
            StaticCatalog catalog = killbillApi.getCatalogUserApi().getCurrentCatalog(null,
                    new EasyTaxTenantContext(kbTenantId, invoiceItem.getAccountId()));
            Plan plan = catalog.findCurrentPlan(planName);
            return (plan != null && plan.getProduct() != null ? plan.getProduct().getName()
                    : null);
        } catch (CatalogApiException e) {
            return null;
        }
    });
}
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * Checks a configuration and the module-to-loader mapping to ensure that
 * no two modules mapped to the same class loader have the same package.
 * It also checks that no two automatic modules have the same package.
 *
 * @throws LayerInstantiationException
 */
private static void checkForDuplicatePkgs(Configuration cf,
                                          Function<String, ClassLoader> clf)
{
    // HashMap allows null keys
    Map<ClassLoader, Set<String>> loaderToPackages = new HashMap<>();
    for (ResolvedModule resolvedModule : cf.modules()) {
        ModuleDescriptor descriptor = resolvedModule.reference().descriptor();
        ClassLoader loader = clf.apply(descriptor.name());

        Set<String> loaderPackages
            = loaderToPackages.computeIfAbsent(loader, k -> new HashSet<>());

        for (String pkg : descriptor.packages()) {
            boolean added = loaderPackages.add(pkg);
            if (!added) {
                throw fail("More than one module with package %s mapped" +
                           " to the same class loader", pkg);
            }
        }
    }
}
 

import java.util.Map; //導入方法依賴的package包/類
@Override
public Map<String, List<EventEnvelope>> findPendingSagaEvents() {
  List<SagaEventEntity> events = repo.findIncompleteSagaEventsGroupBySagaId();

  Map<String, List<EventEnvelope>> pendingEvents = new HashMap<>();
  for (SagaEventEntity event : events) {
    pendingEvents.computeIfAbsent(event.sagaId(), id -> new LinkedList<>());
    pendingEvents.get(event.sagaId()).add(
        new EventEnvelope(
            event.id(),
            event.creationTime(),
            sagaEventFormat.toSagaEvent(event.sagaId(), event.type(), event.contentJson())));
  }

  return pendingEvents;
}
 

import java.util.Map; //導入方法依賴的package包/類
public Rpcs mapRpcs() {

        final Map<String, Map<String, ModuleRpcs>> map = new HashMap<>();

        for (final Map.Entry<String, Map<String, ModuleMXBeanEntry>> namespaceToModuleEntry : yangStoreService
                .getModuleMXBeanEntryMap().entrySet()) {

            Map<String, ModuleRpcs> namespaceToModules = map.computeIfAbsent(namespaceToModuleEntry.getKey(),
                k -> new HashMap<>());

            for (final Map.Entry<String, ModuleMXBeanEntry> moduleEntry : namespaceToModuleEntry.getValue()
                    .entrySet()) {

                ModuleRpcs rpcMapping = namespaceToModules.computeIfAbsent(moduleEntry.getKey(),
                    k -> new ModuleRpcs(yangStoreService.getEnumResolver()));

                final ModuleMXBeanEntry entry = moduleEntry.getValue();

                for (final RuntimeBeanEntry runtimeEntry : entry.getRuntimeBeans()) {
                    rpcMapping.addNameMapping(runtimeEntry);
                    for (final RuntimeBeanEntry.Rpc rpc : runtimeEntry.getRpcs()) {
                        rpcMapping.addRpc(runtimeEntry, rpc);
                    }
                }
            }
        }

        return new Rpcs(map);
    }
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * Retrieve the computed value for specified parameters, creating it if necessary.
 *
 * @param args the arguments passed to the memoized function.
 */
@SuppressWarnings( "unchecked" )
private ComputedValue<T> getComputedValue( @Nonnull final Object... args )
{
  apiInvariant( () -> args.length == _argCount,
                () -> "MemoizeCache.getComputedValue called with " + args.length + " arguments but expected " +
                      _argCount + " arguments." );
  Map<Object, Object> map = _cache;
  final int size = args.length - 1;
  for ( int i = 0; i < size; i++ )
  {
    map = (Map<Object, Object>) map.computeIfAbsent( args[ i ], v -> new HashMap<>() );
  }
  return (ComputedValue<T>) map.computeIfAbsent( args[ size ], v -> createComputedValue( args ) );
}
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * Adjust the Class Tree. Add the class interface  in to it's super classes
 * or super interface's sub-interface set.
 *
 * @param map the entire map.
 * @param superclass java.lang.Object or the super-interface.
 * @param typeElement sub-interface to be mapped.
 * @returns boolean true if class added, false if class already processed.
 */
private boolean add(Map<TypeElement, SortedSet<TypeElement>> map, TypeElement superclass, TypeElement typeElement) {
    SortedSet<TypeElement> sset = map.computeIfAbsent(superclass, s ->  new TreeSet<>(comparator));
    if (sset.contains(typeElement)) {
        return false;
    } else {
        sset.add(typeElement);
    }
    return true;
}
 

import java.util.Map; //導入方法依賴的package包/類
public void validateGitHubRepositoryExists(UIValidationContext context, String repository) {
    Map<Object, Object> attributeMap = context.getUIContext().getAttributeMap();
    String validationMessage = (String) attributeMap.computeIfAbsent("validate_repo_" + repository, key -> {
        List<String> authList = (List<String>) attributeMap.get(HttpHeaders.AUTHORIZATION);
        String authHeader = (authList == null || authList.isEmpty()) ? null : authList.get(0);
        return missionControlFacade.validateGitHubRepositoryExists(authHeader, repository);
    });
    if (validationMessage != null && !MissionControl.VALIDATION_MESSAGE_OK.equals(validationMessage)) {
        context.addValidationError(context.getCurrentInputComponent(), validationMessage);
    }
}
 

import java.util.Map; //導入方法依賴的package包/類
public void validateOpenShiftProjectExists(UIValidationContext context, String project, String cluster) {
    Map<Object, Object> attributeMap = context.getUIContext().getAttributeMap();
    String validationMessage = (String) attributeMap.computeIfAbsent("validate_project_" + project, key -> {
        List<String> authList = (List<String>) attributeMap.get(HttpHeaders.AUTHORIZATION);
        String authHeader = (authList == null || authList.isEmpty()) ? null : authList.get(0);
        return missionControlFacade.validateOpenShiftProjectExists(authHeader, project, cluster);
    });
    if (validationMessage != null && !MissionControl.VALIDATION_MESSAGE_OK.equals(validationMessage)) {
        context.addValidationWarning(context.getCurrentInputComponent(), validationMessage);
    }
}
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * Install a new region.
 */
private ProvLocation installRegion(final Map<String, ProvLocation> regions, final String region, final Node node) {
	return regions.computeIfAbsent(region, r -> {
		final ProvLocation location = new ProvLocation();
		location.setNode(node);
		location.setName(r);
		locationRepository.saveAndFlush(location);
		return location;
	});
}
 

import java.util.Map; //導入方法依賴的package包/類
private void addStatesToGlobalMapForMethod(
    DexEncodedMethod method, Set<NamingState<DexProto>> collectedStates,
    Map<Wrapper<DexMethod>, Set<NamingState<DexProto>>> globalStateMap,
    Map<Wrapper<DexMethod>, Set<DexMethod>> sourceMethodsMap,
    Map<Wrapper<DexMethod>, NamingState<DexProto>> originStates, DexType originInterface) {
  Wrapper<DexMethod> key = equivalence.wrap(method.method);
  Set<NamingState<DexProto>> stateSet =
      globalStateMap.computeIfAbsent(key, k -> new HashSet<>());
  stateSet.addAll(collectedStates);
  sourceMethodsMap.computeIfAbsent(key, k -> new HashSet<>()).add(method.method);
  originStates.putIfAbsent(key, states.get(originInterface));
}
 

import java.util.Map; //導入方法依賴的package包/類
/**
 * Inspects the instance graph for cycles, any cycle is printed as an error.   The nameToEntity parameter doesn't list expected
 * instances, any instances that are not found in the nameToInstances map (they are looked for because they are referenced as a
 * dependency by an instance in the map) and are not found by name in the definition's expectedInstances are treated as errors
 * as well.
 * 
 * @param definition definition being processed.  Will uses it's expected list, any instances references as dependencies but
 *     not found, not listed as expected in this DefinitionModel, will be treated as errors.
 * @param nameToEntity name to unique instanceModels, verified before call.
 * @param errorListner accepts and displays all errors produced by analyzing the models
 * @return true if an error occurred, false otherwise
 */
private boolean detectCyclesInEntityGraph(final DefinitionModel definition, final Map<String, InstanceModel> nameToEntity,
    final Consumer<ErrorModel> errorListener) {
  final Map<String, ExpectedModel> missing = new HashMap<>();
  final DirectedGraph<BaseInstanceModel, DefaultEdge> entityGraph = new DefaultDirectedGraph<>(DefaultEdge.class);
  for (BaseInstanceModel entity : nameToEntity.values()) {
    if (!entityGraph.containsVertex(entity)) {
      entityGraph.addVertex(entity);
    }
    if (InstanceModel.class.isAssignableFrom(entity.getClass())) {
      InstanceModel instanceModel = (InstanceModel) entity;
      for (InstanceDependencyModel instanceDependency : instanceModel.getDependencies()) {
        BaseInstanceModel dependency = nameToEntity.get(instanceDependency.getIdentity());
        if (dependency == null) {
          dependency = missing.computeIfAbsent(instanceDependency.getIdentity(), s -> new ExpectedModel(s));
          missing.get(instanceDependency.getIdentity())
            .addDefinitionReferenceToType(instanceModel.getIdentity(), instanceDependency.getType());
        }
        if (!entityGraph.containsVertex(dependency)) {
          entityGraph.addVertex(dependency);
        }
        entityGraph.addEdge(entity, dependency);
      }
    }
  }
  
  boolean errored = errorsForCycles(errorListener, entityGraph);
  errored = testAllMissingEntitiesAreExpected(definition, errorListener, missing, entityGraph) || errored;
  errored = errorUnusedExpectedsOnDefinition(definition, errorListener, missing) || errored;
  return errored;
}
 

import java.util.Map; //導入方法依賴的package包/類
private Suggest reducedSuggest(AtomicArray<QuerySearchResultProvider> results) {
    Map<String, List<Suggest.Suggestion<CompletionSuggestion.Entry>>> groupedSuggestion = new HashMap<>();
    for (AtomicArray.Entry<QuerySearchResultProvider> entry : results.asList()) {
        for (Suggest.Suggestion<?> suggestion : entry.value.queryResult().suggest()) {
            List<Suggest.Suggestion<CompletionSuggestion.Entry>> suggests =
                groupedSuggestion.computeIfAbsent(suggestion.getName(), s -> new ArrayList<>());
            suggests.add((Suggest.Suggestion<CompletionSuggestion.Entry>) suggestion);
        }
    }
    return new Suggest(groupedSuggestion.values().stream().map(CompletionSuggestion::reduceTo)
        .collect(Collectors.toList()));
}