com.facebook.presto.split.DataStreamManager.java Source code

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Here is the source code for com.facebook.presto.split.DataStreamManager.java

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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.split;

import com.facebook.presto.operator.Operator;
import com.facebook.presto.operator.OperatorContext;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.Split;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;

import javax.inject.Inject;

import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

public class DataStreamManager implements DataStreamProvider {
    private final Set<ConnectorDataStreamProvider> dataStreamProviders = Sets
            .newSetFromMap(new ConcurrentHashMap<ConnectorDataStreamProvider, Boolean>());

    public DataStreamManager(ConnectorDataStreamProvider... dataStreamProviders) {
        this(ImmutableSet.copyOf(dataStreamProviders));
    }

    @Inject
    public DataStreamManager(Set<ConnectorDataStreamProvider> dataStreamProviders) {
        this.dataStreamProviders.addAll(dataStreamProviders);
    }

    public void addConnectorDataStreamProvider(ConnectorDataStreamProvider connectorDataStreamProvider) {
        dataStreamProviders.add(connectorDataStreamProvider);
    }

    @Override
    public Operator createNewDataStream(OperatorContext operatorContext, Split split, List<ColumnHandle> columns) {
        checkNotNull(operatorContext, "operatorContext is null");
        checkNotNull(split, "split is null");
        checkNotNull(columns, "columns is null");
        checkArgument(!columns.isEmpty(), "no columns specified");

        return getDataStreamProvider(split).createNewDataStream(operatorContext, split, columns);
    }

    private ConnectorDataStreamProvider getDataStreamProvider(Split split) {
        for (ConnectorDataStreamProvider dataStreamProvider : dataStreamProviders) {
            if (dataStreamProvider.canHandle(split)) {
                return dataStreamProvider;
            }
        }
        throw new IllegalArgumentException("No data stream provider for " + split);
    }
}