/*
* 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.operator;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.type.Type;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
public class InMemoryExchangeSourceOperator
implements Operator
{
public static class InMemoryExchangeSourceOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final InMemoryExchange inMemoryExchange;
private boolean closed;
public InMemoryExchangeSourceOperatorFactory(int operatorId, InMemoryExchange inMemoryExchange)
{
this.operatorId = operatorId;
this.inMemoryExchange = inMemoryExchange;
}
@Override
public List<Type> getTypes()
{
return inMemoryExchange.getTypes();
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, InMemoryExchangeSourceOperator.class.getSimpleName());
return new InMemoryExchangeSourceOperator(operatorContext, inMemoryExchange);
}
@Override
public void close()
{
closed = true;
}
}
private final OperatorContext operatorContext;
private final InMemoryExchange exchange;
public InMemoryExchangeSourceOperator(OperatorContext operatorContext, InMemoryExchange exchange)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.exchange = checkNotNull(exchange, "exchange is null");
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return exchange.getTypes();
}
@Override
public void finish()
{
exchange.finish();
}
@Override
public boolean isFinished()
{
return exchange.isFinished();
}
@Override
public ListenableFuture<?> isBlocked()
{
ListenableFuture<?> blocked = exchange.waitForReading();
if (blocked.isDone()) {
return NOT_BLOCKED;
}
return blocked;
}
@Override
public boolean needsInput()
{
return false;
}
@Override
public void addInput(Page page)
{
throw new UnsupportedOperationException();
}
@Override
public Page getOutput()
{
Page page = exchange.removePage();
if (page != null) {
operatorContext.recordGeneratedInput(page.getSizeInBytes(), page.getPositionCount());
}
return page;
}
}