本文整理了Java中org.apache.pulsar.zookeeper.ZooKeeperDataCache.get()方法的一些代码示例，展示了ZooKeeperDataCache.get()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ZooKeeperDataCache.get()方法的具体详情如下：
包路径：org.apache.pulsar.zookeeper.ZooKeeperDataCache
类名称：ZooKeeperDataCache
方法名：get

ZooKeeperDataCache.get介绍

[英]Return an item from the cache If node doens't exist, the value will be not present.s
[中]从缓存中返回项如果节点不存在，则该值将不存在。s

代码示例

代码示例来源：origin: org.apache.pulsar/pulsar-discovery-service

private void updateBrokerList(Set<String> brokerNodes) throws Exception {
  List<LoadManagerReport> availableBrokers = new ArrayList<>(brokerNodes.size());
  for (String broker : brokerNodes) {
    availableBrokers.add(brokerInfo.get(LOADBALANCE_BROKERS_ROOT + '/' + broker).get());
  }
  this.availableBrokers = availableBrokers;
}

代码示例来源：origin: org.apache.pulsar/pulsar-proxy

private void updateBrokerList(Set<String> brokerNodes) throws Exception {
  List<LoadManagerReport> availableBrokers = new ArrayList<>(brokerNodes.size());
  for (String broker : brokerNodes) {
    availableBrokers.add(brokerInfo.get(LOADBALANCE_BROKERS_ROOT + '/' + broker).get());
  }
  this.availableBrokers = availableBrokers;
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

private String getDynamicConfigurationFromZK(String zkPath, String settingName, String defaultValue) {
  try {
    return dynamicConfigurationCache.get(zkPath).map(c -> c.get(settingName)).orElse(defaultValue);
  } catch (Exception e) {
    log.warn("Got exception when reading ZooKeeper path [{}]:", zkPath, e);
    return defaultValue;
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

public BacklogQuota getBacklogQuota(String namespace, String policyPath) {
  try {
    return zkCache.get(policyPath)
        .map(p -> p.backlog_quota_map.getOrDefault(BacklogQuotaType.destination_storage, defaultQuota))
        .orElse(defaultQuota);
  } catch (Exception e) {
    log.error(String.format("Failed to read policies data, will apply the default backlog quota: namespace=%s",
        namespace), e);
    return this.defaultQuota;
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

private Optional<NamespaceIsolationPolicies> getIsolationPolicies(String clusterName) {
  try {
    return namespaceIsolationPolicies
        .get(AdminResource.path("clusters", clusterName, NAMESPACE_ISOLATION_POLICIES));
  } catch (Exception e) {
    LOG.warn("GetIsolationPolicies: Unable to get the namespaceIsolationPolicies [{}]", e);
    return Optional.empty();
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

private ResourceQuota readQuotaFromZnode(String zpath) {
  try {
    return this.resourceQuotaCache.get(zpath).orElseGet(() -> new ResourceQuota());
  } catch (Exception e) {
    LOG.warn("Failed to read quota from znode {}: {}", zpath, e);
    return new ResourceQuota();
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-zookeeper-utils

@Override
public void setConf(Configuration conf) {
  super.setConf(conf);
  bookieMappingCache = getAndSetZkCache(conf);
  try {
    racksWithHost = bookieMappingCache.get(BOOKIE_INFO_ROOT_PATH).orElse(new BookiesRackConfiguration());
  } catch (Exception e) {
    throw new RuntimeException(e);
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

@GET
@Path("/{tenant}")
@ApiOperation(value = "Get the admin configuration for a given tenant.")
@ApiResponses(value = { @ApiResponse(code = 403, message = "The requester doesn't have admin permissions"),
    @ApiResponse(code = 404, message = "Tenant does not exist") })
public TenantInfo getTenantAdmin(@PathParam("tenant") String tenant) {
  validateSuperUserAccess();
  try {
    return tenantsCache().get(path(POLICIES, tenant))
        .orElseThrow(() -> new RestException(Status.NOT_FOUND, "Tenant does not exist"));
  } catch (Exception e) {
    log.error("[{}] Failed to get tenant {}", clientAppId(), tenant, e);
    throw new RestException(e);
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected boolean isNamespaceReplicated(NamespaceName namespaceName) {
    try {
      final Policies policies = policiesCache().get(ZkAdminPaths.namespacePoliciesPath(namespaceName))
          .orElseThrow(() -> new RestException(Status.NOT_FOUND, "Namespace does not exist"));
      return policies.replication_clusters.size() > 1;
    } catch (RestException re) {
      throw re;
    } catch (Exception e) {
      log.error("[{}] Failed to get namespace policies {}", clientAppId(), namespaceName, e);
      throw new RestException(e);
    }
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected void validateClusterExists(String cluster) {
  try {
    if (!clustersCache().get(path("clusters", cluster)).isPresent()) {
      throw new RestException(Status.PRECONDITION_FAILED, "Cluster " + cluster + " does not exist.");
    }
  } catch (Exception e) {
    throw new RestException(e);
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-websocket

private ClusterData retrieveClusterData() throws PulsarServerException {
  if (configurationCacheService == null) {
    throw new PulsarServerException(
      "Failed to retrieve Cluster data due to empty ConfigurationStoreServers");
  }
  try {
    String path = "/admin/clusters/" + config.getClusterName();
    return localCluster = configurationCacheService.clustersCache().get(path)
        .orElseThrow(() -> new KeeperException.NoNodeException(path));
  } catch (Exception e) {
    throw new PulsarServerException(e);
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

private NamespaceIsolationPolicies getLocalNamespaceIsolationPolicies() throws Exception {
  String localCluster = pulsar.getConfiguration().getClusterName();
  return pulsar.getConfigurationCache().namespaceIsolationPoliciesCache()
      .get(AdminResource.path("clusters", localCluster, NAMESPACE_ISOLATION_POLICIES)).orElseGet(() -> {
        // the namespace isolation policies are empty/undefined = an empty object
        return new NamespaceIsolationPolicies();
      });
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected Policies getNamespacePolicies(NamespaceName namespaceName) {
  try {
    Policies policies = policiesCache().get(AdminResource.path(POLICIES, namespaceName.toString()))
        .orElseThrow(() -> new RestException(Status.NOT_FOUND, "Namespace does not exist"));
    // fetch bundles from LocalZK-policies
    NamespaceBundles bundles = pulsar().getNamespaceService().getNamespaceBundleFactory()
        .getBundles(namespaceName);
    BundlesData bundleData = NamespaceBundleFactory.getBundlesData(bundles);
    policies.bundles = bundleData != null ? bundleData : policies.bundles;
    return policies;
  } catch (RestException re) {
    throw re;
  } catch (Exception e) {
    log.error("[{}] Failed to get namespace policies {}", clientAppId(), namespaceName, e);
    throw new RestException(e);
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected Policies getNamespacePolicies(String property, String cluster, String namespace) {
  try {
    Policies policies = policiesCache().get(AdminResource.path(POLICIES, property, cluster, namespace))
        .orElseThrow(() -> new RestException(Status.NOT_FOUND, "Namespace does not exist"));
    // fetch bundles from LocalZK-policies
    NamespaceBundles bundles = pulsar().getNamespaceService().getNamespaceBundleFactory()
        .getBundles(NamespaceName.get(property, cluster, namespace));
    BundlesData bundleData = NamespaceBundleFactory.getBundlesData(bundles);
    policies.bundles = bundleData != null ? bundleData : policies.bundles;
    return policies;
  } catch (RestException re) {
    throw re;
  } catch (Exception e) {
    log.error("[{}] Failed to get namespace policies {}/{}/{}", clientAppId(), property, cluster, namespace, e);
    throw new RestException(e);
  }
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected boolean isConsumersExceededOnSubscription() {
  Policies policies;
  try {
    policies = topic.getBrokerService().pulsar().getConfigurationCache().policiesCache()
        .get(AdminResource.path(POLICIES, TopicName.get(topicName).getNamespace()))
        .orElseGet(() -> new Policies());
  } catch (Exception e) {
    policies = new Policies();
  }
  final int maxConsumersPerSubscription = policies.max_consumers_per_subscription > 0 ?
      policies.max_consumers_per_subscription :
      serviceConfig.getMaxConsumersPerSubscription();
  if (maxConsumersPerSubscription > 0 && maxConsumersPerSubscription <= consumers.size()) {
    return true;
  }
  return false;
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected boolean isConsumersExceededOnTopic() {
  Policies policies;
  try {
    policies = topic.getBrokerService().pulsar().getConfigurationCache().policiesCache()
        .get(AdminResource.path(POLICIES, TopicName.get(topicName).getNamespace()))
        .orElseGet(() -> new Policies());
  } catch (Exception e) {
    policies = new Policies();
  }
  final int maxConsumersPerTopic = policies.max_consumers_per_topic > 0 ?
      policies.max_consumers_per_topic :
      serviceConfig.getMaxConsumersPerTopic();
  if (maxConsumersPerTopic > 0 && maxConsumersPerTopic <= topic.getNumberOfConsumers()) {
    return true;
  }
  return false;
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected boolean isConsumersExceededOnSubscription() {
  Policies policies;
  try {
    policies = topic.getBrokerService().pulsar().getConfigurationCache().policiesCache()
        .get(AdminResource.path(POLICIES, TopicName.get(topicName).getNamespace()))
        .orElseGet(() -> new Policies());
  } catch (Exception e) {
    policies = new Policies();
  }
  final int maxConsumersPerSubscription = policies.max_consumers_per_subscription > 0 ?
      policies.max_consumers_per_subscription :
      serviceConfig.getMaxConsumersPerSubscription();
  if (maxConsumersPerSubscription > 0 && maxConsumersPerSubscription <= consumers.size()) {
    return true;
  }
  return false;
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

protected boolean isConsumersExceededOnTopic() {
  Policies policies;
  try {
    policies = topic.getBrokerService().pulsar().getConfigurationCache().policiesCache()
        .get(AdminResource.path(POLICIES, TopicName.get(topicName).getNamespace()))
        .orElseGet(() -> new Policies());
  } catch (Exception e) {
    policies = new Policies();
  }
  final int maxConsumersPerTopic = policies.max_consumers_per_topic > 0 ?
      policies.max_consumers_per_topic :
      serviceConfig.getMaxConsumersPerTopic();
  if (maxConsumersPerTopic > 0 && maxConsumersPerTopic <= topic.getNumberOfConsumers()) {
    return true;
  }
  return false;
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

private boolean isProducersExceeded() {
  Policies policies;
  try {
    policies =  brokerService.pulsar().getConfigurationCache().policiesCache()
        .get(AdminResource.path(POLICIES, TopicName.get(topic).getNamespace()))
        .orElseGet(() -> new Policies());
  } catch (Exception e) {
    policies = new Policies();
  }
  final int maxProducers = policies.max_producers_per_topic > 0 ?
      policies.max_producers_per_topic :
      brokerService.pulsar().getConfiguration().getMaxProducersPerTopic();
  if (maxProducers > 0 && maxProducers <= producers.size()) {
    return true;
  }
  return false;
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

private boolean isProducersExceeded() {
  Policies policies;
  try {
    policies =  brokerService.pulsar().getConfigurationCache().policiesCache()
        .get(AdminResource.path(POLICIES, TopicName.get(topic).getNamespace()))
        .orElseGet(() -> new Policies());
  } catch (Exception e) {
    policies = new Policies();
  }
  final int maxProducers = policies.max_producers_per_topic > 0 ?
      policies.max_producers_per_topic :
      brokerService.pulsar().getConfiguration().getMaxProducersPerTopic();
  if (maxProducers > 0 && maxProducers <= producers.size()) {
    return true;
  }
  return false;
}