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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.dispatch.rpc;
import com.yahoo.search.dispatch.FillInvoker;
import com.yahoo.search.dispatch.rpc.Client.NodeConnection;
import com.yahoo.vespa.config.search.DispatchConfig;
import com.yahoo.vespa.config.search.DispatchNodesConfig;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ThreadLocalRandom;
/**
* RpcResourcePool constructs {@link FillInvoker} objects that communicate with content nodes over RPC. It also contains
* the RPC connection pool.
*
* @author ollivir
*/
public class RpcResourcePool implements RpcConnectionPool, AutoCloseable {
/** Connections to the search nodes this talks to, indexed by node id ("partid") */
private volatile Map<Integer, NodeConnectionPool> nodeConnectionPools = Map.of();
private final int numConnections;
private final RpcClient rpcClient;
RpcResourcePool(Map<Integer, NodeConnection> nodeConnections) {
var builder = new HashMap<Integer, NodeConnectionPool>();
nodeConnections.forEach((key, connection) -> builder.put(key, new NodeConnectionPool(List.of(connection))));
this.nodeConnectionPools = Map.copyOf(builder);
this.rpcClient = null;
this.numConnections = 1;
}
public RpcResourcePool(DispatchConfig dispatchConfig, DispatchNodesConfig nodesConfig) {
super();
rpcClient = new RpcClient("dispatch-client", dispatchConfig.numJrtTransportThreads());
numConnections = dispatchConfig.numJrtConnectionsPerNode();
updateNodes(nodesConfig);
}
public void updateNodes(DispatchNodesConfig nodesConfig) {
var builder = new HashMap<Integer, NodeConnectionPool>();
for (var node : nodesConfig.node()) {
var prev = nodeConnectionPools.get(node.key());
NodeConnection nc = prev != null ? prev.nextConnection() : null;
if (nc instanceof RpcClient.RpcNodeConnection rpcNodeConnection
&& rpcNodeConnection.getPort() == node.port()
&& rpcNodeConnection.getHostname().equals(node.host()))
{
builder.put(node.key(), prev);
} else {
if (prev != null) prev.release();
var connections = new ArrayList<NodeConnection>(numConnections);
for (int i = 0; i < numConnections; i++) {
connections.add(rpcClient.createConnection(node.host(), node.port()));
}
builder.put(node.key(), new NodeConnectionPool(connections));
}
}
this.nodeConnectionPools = Map.copyOf(builder);
}
@Override
public NodeConnection getConnection(int nodeId) {
var pool = nodeConnectionPools.get(nodeId);
if (pool == null) {
return null;
} else {
return pool.nextConnection();
}
}
@Override
public void close() {
nodeConnectionPools.values().forEach(NodeConnectionPool::release);
if (rpcClient != null) {
rpcClient.close();
}
}
private static class NodeConnectionPool {
private final List<Client.NodeConnection> connections;
NodeConnectionPool(List<NodeConnection> connections) {
this.connections = connections;
}
Client.NodeConnection nextConnection() {
int slot = ThreadLocalRandom.current().nextInt(connections.size());
return connections.get(slot);
}
void release() {
connections.forEach(Client.NodeConnection::close);
}
}
}
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