/**
* 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.curator.x.rpc.idl.discovery;
import com.facebook.swift.service.ThriftMethod;
import com.facebook.swift.service.ThriftService;
import com.google.common.base.Function;
import com.google.common.collect.Collections2;
import com.google.common.collect.Lists;
import org.apache.curator.x.discovery.DownInstancePolicy;
import org.apache.curator.x.discovery.ProviderStrategy;
import org.apache.curator.x.discovery.ServiceDiscovery;
import org.apache.curator.x.discovery.ServiceDiscoveryBuilder;
import org.apache.curator.x.discovery.ServiceInstance;
import org.apache.curator.x.discovery.ServiceProvider;
import org.apache.curator.x.discovery.ServiceType;
import org.apache.curator.x.discovery.strategies.RandomStrategy;
import org.apache.curator.x.discovery.strategies.RoundRobinStrategy;
import org.apache.curator.x.discovery.strategies.StickyStrategy;
import org.apache.curator.x.rpc.connections.Closer;
import org.apache.curator.x.rpc.connections.ConnectionManager;
import org.apache.curator.x.rpc.connections.CuratorEntry;
import org.apache.curator.x.rpc.idl.exceptions.RpcException;
import org.apache.curator.x.rpc.idl.structs.CuratorProjection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
@ThriftService
public class DiscoveryService
{
private final Logger log = LoggerFactory.getLogger(getClass());
private final ConnectionManager connectionManager;
public DiscoveryService(ConnectionManager connectionManager)
{
this.connectionManager = connectionManager;
}
@ThriftMethod
public DiscoveryInstance makeDiscoveryInstance(String name, byte[] payload, int port) throws RpcException
{
try
{
ServiceInstance<byte[]> serviceInstance = ServiceInstance.<byte[]>builder()
.serviceType(ServiceType.DYNAMIC)
.name(name)
.payload(payload)
.port(port)
.build();
return new DiscoveryInstance(serviceInstance);
}
catch ( Exception e )
{
throw new RpcException(e);
}
}
@ThriftMethod
public DiscoveryProjection startDiscovery(CuratorProjection projection, final String basePath, DiscoveryInstance yourInstance) throws RpcException
{
try
{
CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);
final ServiceDiscovery<byte[]> serviceDiscovery = ServiceDiscoveryBuilder
.builder(byte[].class)
.basePath(basePath)
.client(entry.getClient())
.thisInstance((yourInstance != null) ? yourInstance.toReal() : null)
.build();
serviceDiscovery.start();
Closer closer = new Closer()
{
@Override
public void close()
{
try
{
serviceDiscovery.close();
}
catch ( IOException e )
{
log.error("Could not close ServiceDiscovery with basePath: " + basePath, e);
}
}
};
String id = entry.addThing(serviceDiscovery, closer);
return new DiscoveryProjection(id);
}
catch ( Exception e )
{
throw new RpcException(e);
}
}
@ThriftMethod
public DiscoveryProviderProjection startProvider(CuratorProjection projection, DiscoveryProjection discoveryProjection, final String serviceName, ProviderStrategyType providerStrategy, int downTimeoutMs, int downErrorThreshold) throws RpcException
{
ProviderStrategy<byte[]> strategy;
switch ( providerStrategy )
{
default:
case RANDOM:
{
strategy = new RandomStrategy<byte[]>();
break;
}
case STICKY_RANDOM:
{
strategy = new StickyStrategy<byte[]>(new RandomStrategy<byte[]>());
break;
}
case STICKY_ROUND_ROBIN:
{
strategy = new StickyStrategy<byte[]>(new RoundRobinStrategy<byte[]>());
break;
}
case ROUND_ROBIN:
{
strategy = new RoundRobinStrategy<byte[]>();
break;
}
}
CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);
@SuppressWarnings("unchecked")
ServiceDiscovery<byte[]> serviceDiscovery = CuratorEntry.mustGetThing(entry, discoveryProjection.id, ServiceDiscovery.class);
final ServiceProvider<byte[]> serviceProvider = serviceDiscovery
.serviceProviderBuilder()
.downInstancePolicy(new DownInstancePolicy(downTimeoutMs, TimeUnit.MILLISECONDS, downErrorThreshold))
.providerStrategy(strategy)
.serviceName(serviceName)
.build();
try
{
serviceProvider.start();
Closer closer = new Closer()
{
@Override
public void close()
{
try
{
serviceProvider.close();
}
catch ( IOException e )
{
log.error("Could not close ServiceProvider with serviceName: " + serviceName, e);
}
}
};
String id = entry.addThing(serviceProvider, closer);
return new DiscoveryProviderProjection(id);
}
catch ( Exception e )
{
throw new RpcException(e);
}
}
@ThriftMethod
public DiscoveryInstance getInstance(CuratorProjection projection, DiscoveryProviderProjection providerProjection) throws RpcException
{
CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);
@SuppressWarnings("unchecked")
ServiceProvider<byte[]> serviceProvider = CuratorEntry.mustGetThing(entry, providerProjection.id, ServiceProvider.class);
try
{
return new DiscoveryInstance(serviceProvider.getInstance());
}
catch ( Exception e )
{
throw new RpcException(e);
}
}
@ThriftMethod
public Collection<DiscoveryInstance> getAllInstances(CuratorProjection projection, DiscoveryProviderProjection providerProjection) throws RpcException
{
CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);
@SuppressWarnings("unchecked")
ServiceProvider<byte[]> serviceProvider = CuratorEntry.mustGetThing(entry, providerProjection.id, ServiceProvider.class);
try
{
Collection<ServiceInstance<byte[]>> allInstances = serviceProvider.getAllInstances();
Collection<DiscoveryInstance> transformed = Collections2.transform
(
allInstances,
new Function<ServiceInstance<byte[]>, DiscoveryInstance>()
{
@Override
public DiscoveryInstance apply(ServiceInstance<byte[]> instance)
{
return new DiscoveryInstance(instance);
}
}
);
return Lists.newArrayList(transformed);
}
catch ( Exception e )
{
throw new RpcException(e);
}
}
@ThriftMethod
public void noteError(CuratorProjection projection, DiscoveryProviderProjection providerProjection, String instanceId) throws RpcException
{
CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);
@SuppressWarnings("unchecked")
ServiceProvider<byte[]> serviceProvider = CuratorEntry.mustGetThing(entry, providerProjection.id, ServiceProvider.class);
try
{
for ( ServiceInstance<byte[]> instance : serviceProvider.getAllInstances() )
{
if ( instance.getId().equals(instanceId) )
{
serviceProvider.noteError(instance);
break;
}
}
}
catch ( Exception e )
{
throw new RpcException(e);
}
}
}