SharedContext.java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.repair;
import java.util.Random;
import java.util.function.Supplier;
import org.apache.cassandra.concurrent.ExecutorFactory;
import org.apache.cassandra.concurrent.ScheduledExecutorPlus;
import org.apache.cassandra.concurrent.ScheduledExecutors;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.compaction.CompactionManager;
import org.apache.cassandra.db.compaction.ICompactionManager;
import org.apache.cassandra.gms.FailureDetector;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.gms.IFailureDetector;
import org.apache.cassandra.gms.IGossiper;
import org.apache.cassandra.locator.IEndpointSnitch;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.net.MessageDelivery;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.service.ActiveRepairService;
import org.apache.cassandra.streaming.StreamPlan;
import org.apache.cassandra.utils.Clock;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.MBeanWrapper;
/**
* Access methods to shared resources and services.
* <p>
* In many parts of the code base we reach into the global space to pull out singletons, but this makes testing much harder; the main goals for this type is to make users easier to test.
*
* @see {@link Global#instance} for the main production path
*/
public interface SharedContext
{
InetAddressAndPort broadcastAddressAndPort();
Supplier<Random> random();
Clock clock();
ExecutorFactory executorFactory();
MBeanWrapper mbean();
ScheduledExecutorPlus optionalTasks();
MessageDelivery messaging();
IFailureDetector failureDetector();
IEndpointSnitch snitch();
IGossiper gossiper();
ICompactionManager compactionManager();
ActiveRepairService repair();
IValidationManager validationManager();
TableRepairManager repairManager(ColumnFamilyStore store);
StreamExecutor streamExecutor();
class Global implements SharedContext
{
public static final Global instance = new Global();
@Override
public InetAddressAndPort broadcastAddressAndPort()
{
return FBUtilities.getBroadcastAddressAndPort();
}
@Override
public Supplier<Random> random()
{
return Random::new;
}
@Override
public Clock clock()
{
return Clock.Global.clock();
}
@Override
public ExecutorFactory executorFactory()
{
return ExecutorFactory.Global.executorFactory();
}
@Override
public MBeanWrapper mbean()
{
return MBeanWrapper.instance;
}
@Override
public ScheduledExecutorPlus optionalTasks()
{
return ScheduledExecutors.optionalTasks;
}
@Override
public MessageDelivery messaging()
{
return MessagingService.instance();
}
@Override
public IFailureDetector failureDetector()
{
return FailureDetector.instance;
}
@Override
public IEndpointSnitch snitch()
{
return DatabaseDescriptor.getEndpointSnitch();
}
@Override
public IGossiper gossiper()
{
return Gossiper.instance;
}
@Override
public ICompactionManager compactionManager()
{
return CompactionManager.instance;
}
@Override
public ActiveRepairService repair()
{
return ActiveRepairService.instance();
}
@Override
public IValidationManager validationManager()
{
return ValidationManager.instance;
}
@Override
public TableRepairManager repairManager(ColumnFamilyStore store)
{
return store.getRepairManager();
}
@Override
public StreamExecutor streamExecutor()
{
return StreamPlan::execute;
}
}
}