javax.inject.Provider类的使用及代码示例

x33g5p2x  于2022-01-25 转载在 其他  
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本文整理了Java中javax.inject.Provider类的一些代码示例，展示了Provider类的具体用法。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。Provider类的具体详情如下：
包路径：javax.inject.Provider
类名称：Provider

Provider介绍

[英]Provides instances of T. Typically implemented by an injector. For any type T that can be injected, you can also inject Provider. Compared to injecting T directly, injecting Provider enables:

  • retrieving multiple instances.
  • lazy or optional retrieval of an instance.
  • breaking circular dependencies.
  • abstracting scope so you can look up an instance in a smaller scope from an instance in a containing scope.

For example:

class Car { 
@Inject Car(Provider<Seat> seatProvider) { 
Seat driver = seatProvider.get(); 
Seat passenger = seatProvider.get(); 
... 
} 
}

[中]

代码示例

代码示例来源：origin: dropwizard/dropwizard

@Override
public void writeTo(T entity,
          Class<?> type,
          Type genericType,
          Annotation[] annotations,
          MediaType mediaType,
          MultivaluedMap<String, Object> responseHeaders,
          OutputStream entityStream)
  throws IOException, WebApplicationException {
  final MessageBodyWriter<U> writer = requireNonNull(mbw).get().getMessageBodyWriter(representation,
    representation, annotations, contentType);
  // Fix the headers, because Dropwizard error mappers always set the content type to APPLICATION_JSON
  responseHeaders.putSingle(HttpHeaders.CONTENT_TYPE, contentType);
  writer.writeTo(getRepresentation(entity), representation, representation, annotations,
    contentType, responseHeaders, entityStream);
}

代码示例来源：origin: org.eclipse.che.core/che-core-api-workspace

@Override
@Transactional
public Page<WorkspaceImpl> getWorkspaces(String userId, int maxItems, long skipCount)
  throws ServerException {
 try {
  final List<WorkspaceImpl> list =
    managerProvider
      .get()
      .createNamedQuery("Workspace.getAll", WorkspaceImpl.class)
      .setMaxResults(maxItems)
      .setFirstResult((int) skipCount)
      .getResultList()
      .stream()
      .map(WorkspaceImpl::new)
      .collect(Collectors.toList());
  final long count =
    managerProvider
      .get()
      .createNamedQuery("Workspace.getAllCount", Long.class)
      .getSingleResult();
  return new Page<>(list, skipCount, maxItems, count);
 } catch (RuntimeException x) {
  throw new ServerException(x.getLocalizedMessage(), x);
 }
}

代码示例来源：origin: org.eclipse.che.core/che-core-api-installer

@Override
@Transactional
public List<String> getVersions(String id) throws InstallerException {
 try {
  return managerProvider
    .get()
    .createNamedQuery("Inst.getAllById", InstallerImpl.class)
    .setParameter("id", id)
    .getResultList()
    .stream()
    .map(InstallerImpl::getVersion)
    .collect(Collectors.toList());
 } catch (RuntimeException x) {
  throw new InstallerException(x.getMessage(), x);
 }
}

代码示例来源：origin: Netflix/metacat

@Override
  public Map<String, List<QualifiedName>> getByUris(final String sourceName, final List<String> uris,
    final boolean prefixSearch) {
    final StringBuilder builder = new StringBuilder(SQL_GET_TABLE_NAMES_BY_URIS);
    if (prefixSearch) {
      builder.append(" and ( 1=0");
      uris.forEach(uri -> builder.append(" or uri like '").append(uri).append("%'"));
      builder.append(")");
    } else {
      builder.append(" and uri in (:uris)");
    }
    final Query query = em.get().createNativeQuery(builder.toString());
    query.setParameter("sourceName", sourceName);
    if (!prefixSearch) {
      query.setParameter("uris", uris);
    }
    final List<Object[]> result = query.getResultList();
    return result.stream().collect(Collectors.groupingBy(o -> (String) o[2], Collectors
      .mapping(o -> QualifiedName.ofTable(sourceName, (String) o[0], (String) o[1]), Collectors.toList())));
  }
}

代码示例来源：origin: Netflix/metacat

@Override
public Long count(final String sourceName, final String databaseName, final String tableName) {
  final TypedQuery<Long> query = em.get().createNamedQuery(Partition.NAME_QUERY_GET_COUNT_FOR_TABLE,
    Long.class);
  query.setParameter("sourceName", sourceName);
  query.setParameter("databaseName", databaseName);
  query.setParameter("tableName", tableName);
  return query.getSingleResult();
}

代码示例来源：origin: org.eclipse.che.core/che-core-api-workspace

@Override
@Transactional
public WorkspaceImpl get(String id) throws NotFoundException, ServerException {
 requireNonNull(id, "Required non-null id");
 try {
  final WorkspaceImpl workspace = managerProvider.get().find(WorkspaceImpl.class, id);
  if (workspace == null) {
   throw new NotFoundException(format("Workspace with id '%s' doesn't exist", id));
  }
  return new WorkspaceImpl(workspace);
 } catch (RuntimeException x) {
  throw new ServerException(x.getLocalizedMessage(), x);
 }
}

代码示例来源：origin: Netflix/metacat

@Override
public List<Database> getBySourceDatabaseNames(final String sourceName, final List<String> databaseNames) {
  final TypedQuery<Database> query = em.get().createNamedQuery(Database.NAME_QUERY_GET_BY_SOURCE_DATABASE_NAMES,
    Database.class);
  query.setParameter("sourceName", sourceName);
  query.setParameter("databaseNames", databaseNames);
  return query.getResultList();
}

代码示例来源：origin: org.eclipse.che.core/che-core-api-ssh

@Transactional
protected void doCreate(SshPairImpl entity) {
 EntityManager manager = managerProvider.get();
 manager.persist(entity);
 manager.flush();
}

代码示例来源：origin: Netflix/eureka

@Override
  public Supplier<Boolean> get() {
    final EurekaUpStatusResolver resolver = upStatus.get();
    return new Supplier<Boolean>() {
      @Override
      public Boolean get() {
        return !resolver.getStatus().equals(InstanceInfo.InstanceStatus.UP);
      }
    };
  }
}

代码示例来源：origin: org.eclipse.che.multiuser/che-multiuser-api-resource

@Transactional
protected void doRemove(String id) {
 final EntityManager manager = managerProvider.get();
 final FreeResourcesLimitImpl resourcesLimit = manager.find(FreeResourcesLimitImpl.class, id);
 if (resourcesLimit != null) {
  manager.remove(resourcesLimit);
  manager.flush();
 }
}

代码示例来源：origin: Netflix/metacat

@Override
public List<Table> searchBySourceDatabaseTableName(final String sourceName, final String databaseName,
  final String tableNamePrefix, final Sort sort, final Pageable pageable) {
  final StringBuilder queryBuilder = new StringBuilder(SQL_SEARCH_TABLES);
  if (sort != null && sort.hasSort()) {
    queryBuilder.append(" order by ").append(sort.getSortBy()).append(" ").append(sort.getOrder().name());
  }
  final TypedQuery<Table> query = em.get().createQuery(queryBuilder.toString(), Table.class);
  query.setParameter("sourceName", sourceName);
  query.setParameter("databaseName", databaseName);
  query.setParameter("isTableNameNull", tableNamePrefix == null ? 1 : 0);
  query.setParameter("tableName", tableNamePrefix + "%");
  if (pageable != null && pageable.isPageable()) {
    query.setFirstResult(pageable.getOffset());
    query.setMaxResults(pageable.getLimit());
  }
  return query.getResultList();
}

代码示例来源：origin: Netflix/metacat

@Override
public List<T> get(final Iterable<Long> ids) {
  final EntityManager entityManager = em.get();
  final CriteriaBuilder cb = entityManager.getCriteriaBuilder();
  final CriteriaQuery<T> criteriaQuery = cb.createQuery(getEntityClass());
  final Root<T> root = criteriaQuery.from(getEntityClass());
  criteriaQuery.where(root.get("id").in(Lists.newArrayList(ids)));
  return entityManager.createQuery(criteriaQuery).getResultList();
}

代码示例来源：origin: Netflix/metacat

@Override
@SuppressFBWarnings
public T getByName(final String name) {
  T result = null;
  Preconditions.checkArgument(name != null, "Name cannot be null.");
  final TypedQuery<T> query = em.get()
    .createQuery(String.format(SQL_GET_BY_NAME, getEntityClass().getName()), getEntityClass());
  query.setParameter("name", name);
  try {
    result = query.getSingleResult();
  } catch (Exception ignored) { }
  return result;
}

代码示例来源：origin: Netflix/metacat

@Override
  public long count() {
    return (long) em.get().createQuery("select count(a) from " + getEntityClass().getName() + " a")
      .getSingleResult();
  }
}

代码示例来源：origin: org.eclipse.che.core/che-core-api-installer

@Transactional
protected void doRemove(InstallerFqn fqn) {
 final EntityManager manager = managerProvider.get();
 InstallerImpl installer =
   manager
     .createNamedQuery("Inst.getByKey", InstallerImpl.class)
     .setParameter("id", fqn.getId())
     .setParameter("version", fqn.getVersion())
     .getSingleResult();
 manager.remove(installer);
 manager.flush();
}

代码示例来源：origin: Netflix/metacat

@Override
public T get(final Long id) {
  Preconditions.checkArgument(id != null, "Id cannot be null.");
  return em.get().find(getEntityClass(), id);
}

代码示例来源：origin: org.eclipse.che.multiuser/che-multiuser-api-resource

private long getTotalCount() throws ServerException {
 return managerProvider
   .get()
   .createNamedQuery("FreeResourcesLimit.getTotalCount", Long.class)
   .getSingleResult();
}

代码示例来源：origin: org.eclipse.che.core/che-core-api-installer

@Override
@Transactional
public Page<InstallerImpl> getAll(int maxItems, long skipCount) throws InstallerException {
 checkArgument(maxItems >= 0, "The number of items to return can't be negative.");
 checkArgument(
   skipCount >= 0 && skipCount <= Integer.MAX_VALUE,
   "The number of items to skip can't be negative or greater than " + Integer.MAX_VALUE);
 try {
  final List<InstallerImpl> list =
    managerProvider
      .get()
      .createNamedQuery("Inst.getAll", InstallerImpl.class)
      .setMaxResults(maxItems)
      .setFirstResult((int) skipCount)
      .getResultList();
  return new Page<>(list, skipCount, maxItems, getTotalCount());
 } catch (RuntimeException x) {
  throw new InstallerException(x.getMessage(), x);
 }
}

代码示例来源：origin: Netflix/metacat

@Override
public void delete(final T entity) {
  Preconditions.checkArgument(entity != null, "Entity cannot be null.");
  final EntityManager entityManager = em.get();
  entityManager.remove(entity);
}

代码示例来源：origin: Netflix/metacat

@Override
public void deleteByNames(final String sourceName, final String databaseName, final String tableName,
  final List<String> partitionNames) {
  final Query query = em.get().createNamedQuery(Partition.NAME_QUERY_DELETE_BY_PARTITION_NAMES);
  query.setParameter("sourceName", sourceName);
  query.setParameter("databaseName", databaseName);
  query.setParameter("tableName", tableName);
  query.setParameter("partitionNames", partitionNames);
  query.executeUpdate();
}

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