hadoop AbstractDTService 源码

  • 2022-10-20
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haddop AbstractDTService 代码


 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.hadoop.fs.s3a.auth.delegation;

import java.io.IOException;
import java.net.URI;

import org.apache.hadoop.util.Preconditions;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.s3a.impl.StoreContext;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.service.AbstractService;

import static java.util.Objects.requireNonNull;

 * This is the base class for both the delegation binding
 * code and the back end service created; allows for
 * shared methods across both.
 * The lifecycle sequence is as follows
 * <pre>
 *   - create
 *   - bindToFileSystem(uri, ownerFS)
 *   - init
 *   - start
 *   ...api calls...
 *   - stop
 * </pre>
 * As the S3ADelegation mechanism is all configured during the filesystem
 * initalize() operation, it is not ready for use through all the start process.
public abstract class AbstractDTService
    extends AbstractService {

   * URI of the filesystem.
   * Valid after {@link #bindToFileSystem(URI, StoreContext, DelegationOperations)}.
  private URI canonicalUri;

   * Owner of the filesystem.
   * Valid after {@link #bindToFileSystem(URI, StoreContext, DelegationOperations)}.
  private UserGroupInformation owner;

   * Store Context for callbacks into the FS.
   * Valid after {@link #bindToFileSystem(URI, StoreContext, DelegationOperations)}.
  private StoreContext storeContext;

   * Callbacks for DT-related operations.
  private DelegationOperations policyProvider;

   * Protected constructor.
   * @param name service name.
  protected AbstractDTService(final String name) {

   * Bind to the filesystem.
   * Subclasses can use this to perform their own binding operations -
   * but they must always call their superclass implementation.
   * This <i>Must</i> be called before calling {@code init()}.
   * <b>Important:</b>
   * This binding will happen during FileSystem.initialize(); the FS
   * is not live for actual use and will not yet have interacted with
   * AWS services.
   * @param uri the canonical URI of the FS.
   * @param context store context
   * @param delegationOperations delegation operations
   * @throws IOException failure.
  public void bindToFileSystem(
      final URI uri,
      final StoreContext context,
      final DelegationOperations delegationOperations) throws IOException {
    Preconditions.checkState(canonicalUri == null,
        "bindToFileSystem called twice");
    this.canonicalUri = requireNonNull(uri);
    this.storeContext = requireNonNull(context);
    this.owner = context.getOwner();
    this.policyProvider = delegationOperations;

   * Get the canonical URI of the filesystem, which is what is
   * used to identify the tokens.
   * @return the URI.
  public URI getCanonicalUri() {
    return canonicalUri;

   * Get the owner of this Service.
   * @return owner; non-null after binding to an FS.
  public UserGroupInformation getOwner() {
    return owner;

  protected StoreContext getStoreContext() {
    return storeContext;

  protected DelegationOperations getPolicyProvider() {
    return policyProvider;

   * Require that the service is in a given state.
   * @param state desired state.
   * @throws IllegalStateException if the condition is not met
  protected void requireServiceState(final STATE state)
      throws IllegalStateException {
        "Required State: %s; Actual State %s", state, getServiceState());

   * Require the service to be started.
   * @throws IllegalStateException if it is not.
  protected void requireServiceStarted() throws IllegalStateException {

  protected void serviceInit(final Configuration conf) throws Exception {
    requireNonNull(canonicalUri, "service does not have a canonical URI");


hadoop 源码目录


hadoop AWSPolicyProvider 源码

hadoop AbstractDelegationTokenBinding 源码

hadoop AbstractS3ATokenIdentifier 源码

hadoop DelegationConstants 源码

hadoop DelegationOperations 源码

hadoop DelegationTokenIOException 源码

hadoop DelegationTokenProvider 源码

hadoop EncryptionSecretOperations 源码

hadoop EncryptionSecrets 源码

hadoop FullCredentialsTokenBinding 源码

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