TaskExchangeClientManager.java
/*
* 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.memory.context.LocalMemoryContext;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import javax.annotation.concurrent.GuardedBy;
import java.util.ArrayList;
import java.util.List;
import static java.util.Objects.requireNonNull;
// A TaskExchangeClientManager should be created for each SqlTask/SqlTaskExecution
public class TaskExchangeClientManager
{
private final ExchangeClientSupplier supplier;
@GuardedBy("this")
private final List<ExchangeClient> exchangeClients;
@VisibleForTesting
public TaskExchangeClientManager(ExchangeClientSupplier supplier)
{
this.supplier = requireNonNull(supplier, "supplier is null");
this.exchangeClients = new ArrayList<>();
}
public synchronized ExchangeClient createExchangeClient(LocalMemoryContext systemMemoryContext)
{
ExchangeClient exchangeClient = supplier.get(systemMemoryContext);
exchangeClients.add(exchangeClient);
return exchangeClient;
}
public synchronized List<ExchangeClient> getExchangeClients()
{
return ImmutableList.copyOf(exchangeClients);
}
}