/*
 * 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.
 */
 digraph g {

  graph [compound = true];

  //presentation
  splines = true;
  overlap = false;
  rankdir = TB;

  subgraph cluster_upstream {
    label="Upstream Systems";
    upstream_databases [label="Databases", shape="cylinder"]
    upstream_filesystems [label="Filesystems", shape="tab"]
    upstream_generators [label="Generators"]
    upstream_queues [label="Queues", shape="trapezium"]
  }

  subgraph cluster_streams {
    label="Apache Streams Pipelines";
    providers [label="Providers"]
    persistReaders [label="PersistReaders"]
    processors [label="Processors"]
    persistWriters [label="PersistWriters"]
  }

  subgraph cluster_downstream {
    label="Downstream Systems";
    downstream_databases [label="Databases", shape="cylinder"]
    downstream_filesystems [label="Filesystems", shape="tab"]
    downstream_queues [label="Queues", shape="trapezium"]
  }

  upstream_generators -> providers
  upstream_databases -> persistReaders
  upstream_filesystems -> persistReaders
  upstream_queues -> persistReaders
  providers,persistReaders -> processors
  processors -> processors
  processors -> persistWriters
  persistWriters -> downstream_databases
  persistWriters -> downstream_filesystems
  persistWriters -> downstream_queues

}