/*
* 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.Session;
import com.facebook.presto.connector.ConnectorId;
import com.facebook.presto.metadata.Split;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ConnectorPageSource;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.connector.ConnectorPageSourceProvider;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class PageSourceManager
implements PageSourceProvider
{
private final ConcurrentMap<ConnectorId, ConnectorPageSourceProvider> pageSourceProviders = new ConcurrentHashMap<>();
public void addConnectorPageSourceProvider(ConnectorId connectorId, ConnectorPageSourceProvider pageSourceProvider)
{
requireNonNull(connectorId, "connectorId is null");
requireNonNull(pageSourceProvider, "pageSourceProvider is null");
checkState(pageSourceProviders.put(connectorId, pageSourceProvider) == null, "PageSourceProvider for connector '%s' is already registered", connectorId);
}
public void removeConnectorPageSourceProvider(ConnectorId connectorId)
{
pageSourceProviders.remove(connectorId);
}
@Override
public ConnectorPageSource createPageSource(Session session, Split split, List<ColumnHandle> columns)
{
requireNonNull(split, "split is null");
requireNonNull(columns, "columns is null");
ConnectorSession connectorSession = session.toConnectorSession(split.getConnectorId());
return getPageSourceProvider(split).createPageSource(split.getTransactionHandle(), connectorSession, split.getConnectorSplit(), columns);
}
private ConnectorPageSourceProvider getPageSourceProvider(Split split)
{
ConnectorPageSourceProvider provider = pageSourceProviders.get(split.getConnectorId());
checkArgument(provider != null, "No page stream provider for '%s", split.getConnectorId());
return provider;
}
}