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A distributed stream processing framework built upon Apache Kafka and Apache Hadoop YARN.

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/*
 * 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.samza.system.azureblob;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.apache.samza.system.SystemAdmin;
import org.apache.samza.system.SystemStreamMetadata;
import org.apache.samza.system.SystemStreamPartition;


/**
 * {@inheritDoc}
 */
public class AzureBlobSystemAdmin implements SystemAdmin {
  public Map getOffsetsAfter(Map offsets) {
    throw new UnsupportedOperationException("getOffsetsAfter not supported for AzureBlobSystemAdmin");
  }

  /**
   * SystemAdmin.getSystemStreamMetadata is directly or indirectly used for the following purposes
   * 1. Get number of partitions which is then used to validate joins or calculate intermediate streams
   * 2. CoordinatorStream purposes, offsets for SystemConsumer, changelog offsets or cache of SSP metadata
   * The (2) category of usages are not relevant for AzureBlob as it has no consumer.
   * The (1) usage is again not relevant for AzureBlob as it can not be an input to join
   * or affect an intermediate stream as it is currently supporting only an output stream.
   * Additionally, AzureBlob has no concept of a partition and
   * SystemStreamMetadata gives oldest, newest and upcoming offsets for a stream which are not relevant for an Azure Blob.
   * Hence, returning empty map is acceptable.
   * @param streamNames
   *          The streams to to fetch metadata for.
   * @return map of streamName to {@link org.apache.samza.system.SystemStreamMetadata}
   *         returns an empty map.
   */
  public Map getSystemStreamMetadata(Set streamNames) {
    return new HashMap<>();
  }

  public Integer offsetComparator(String offset1, String offset2) {
    throw new UnsupportedOperationException("offsetComparator not supported for AzureBlobSystemAdmin");
  }
}