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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus.network.rpc;
import com.yahoo.concurrent.CopyOnWriteHashMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Class used to reuse services for the same address when sending messages over the rpc network.
*
* @author Simon Thoresen Hult
*/
public class RPCServicePool {
private final RPCNetwork net;
private final Map<Long, ServiceLRUCache> mapOfServiceCache;
private final int maxSize;
/**
* Create a new service pool for the given network.
*
* @param net The underlying RPC network.
* @param maxSize The max number of services to cache.
*/
public RPCServicePool(RPCNetwork net, int maxSize) {
this.net = net;
mapOfServiceCache = new CopyOnWriteHashMap<>();
this.maxSize = maxSize;
}
/**
* Returns the RPCServiceAddress that corresponds to a given pattern. This reuses the RPCService object for matching
* pattern so that load balancing is possible on the network level.
*
* @param pattern The pattern for the service we require.
* @return A service address for the given pattern.
*/
public RPCServiceAddress resolve(String pattern) {
return getPerThreadCache().computeIfAbsent(pattern, (key) -> RPCService.create(net.getMirror(), key)).resolve();
}
private ServiceLRUCache getPerThreadCache() {
return mapOfServiceCache.computeIfAbsent(Thread.currentThread().getId(), (key) -> new ServiceLRUCache(maxSize));
}
/**
* Returns the number of services available in the pool. This number will never exceed the limit given at
* construction time.
*
* @return The current size of this pool.
*/
public int getSize() {
return getPerThreadCache().size();
}
/**
* Returns whether or not there is a service available in the pool the corresponds to the given pattern.
*
* @param pattern The pattern to check for.
* @return True if a corresponding service is in the pool.
*/
public boolean hasService(String pattern) {
return getPerThreadCache().containsKey(pattern);
}
private static class ServiceLRUCache extends LinkedHashMap<String, RPCService> {
private final int maxSize;
ServiceLRUCache(int maxSize) {
super(16, 0.75f, true);
this.maxSize = maxSize;
}
@Override
protected boolean removeEldestEntry(Map.Entry<String, RPCService> entry) {
return size() > maxSize;
}
}
}
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