/*
 * 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.nifi.controller.repository;

import org.apache.nifi.connectable.Connection;
import org.apache.nifi.controller.flow.FlowManager;
import org.apache.nifi.controller.queue.FlowFileQueue;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class StandardQueueProvider implements QueueProvider {
    private final FlowManager flowManager;

    public StandardQueueProvider(final FlowManager flowManager) {
        this.flowManager = flowManager;
    }

    @Override
    public Collection<FlowFileQueue> getAllQueues() {
        final Collection<Connection> connections = flowManager.findAllConnections();
        final List<FlowFileQueue> queues = new ArrayList<>(connections.size());
        for (final Connection connection : connections) {
            queues.add(connection.getFlowFileQueue());
        }

        return queues;
    }
}
