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Presto - Black Hole Connector

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/*
 * Licensed 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 com.facebook.presto.plugin.blackhole;

import com.facebook.presto.spi.NodeManager;
import com.facebook.presto.spi.Plugin;
import com.facebook.presto.spi.connector.ConnectorFactory;
import com.facebook.presto.spi.type.TypeManager;
import com.google.common.collect.ImmutableList;

import javax.inject.Inject;

import java.util.List;

import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;

public final class BlackHolePlugin
        implements Plugin
{
    private NodeManager nodeManager;
    private TypeManager typeManager;

    @Inject
    public void setNodeManager(NodeManager nodeManager)
    {
        this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
    }

    @Inject
    public void setTypeManager(TypeManager typeManager)
    {
        this.typeManager = requireNonNull(typeManager, "typeManager is null");
    }

    @Override
    public  List getServices(Class type)
    {
        if (type == ConnectorFactory.class) {
            checkState(nodeManager != null, "NodeManager has not been set");
            checkState(typeManager != null, "TypeManager has not been set");
            return ImmutableList.of(type.cast(new BlackHoleConnectorFactory(nodeManager, typeManager)));
        }
        return ImmutableList.of();
    }
}