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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.dispatch;
import com.yahoo.compress.CompressionType;
import com.yahoo.jrt.DataValue;
import com.yahoo.jrt.Int32Value;
import com.yahoo.jrt.Int8Value;
import com.yahoo.jrt.Request;
import com.yahoo.jrt.RequestWaiter;
import com.yahoo.jrt.Spec;
import com.yahoo.jrt.Supervisor;
import com.yahoo.jrt.Target;
import com.yahoo.jrt.Transport;
import com.yahoo.jrt.Values;
import com.yahoo.prelude.fastsearch.FastHit;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
/**
* A client which uses rpc request to search nodes to implement the Client API.
*
* @author bratseth
*/
class RpcClient implements Client {
private final Supervisor supervisor = new Supervisor(new Transport());
@Override
public NodeConnection createConnection(String hostname, int port) {
return new RpcNodeConnection(hostname, port, supervisor);
}
@Override
public void getDocsums(List<FastHit> hits, NodeConnection node, CompressionType compression, int uncompressedLength,
byte[] compressedSlime, Dispatcher.GetDocsumsResponseReceiver responseReceiver, double timeoutSeconds) {
Request request = new Request("proton.getDocsums");
request.parameters().add(new Int8Value(compression.getCode()));
request.parameters().add(new Int32Value(uncompressedLength));
request.parameters().add(new DataValue(compressedSlime));
request.setContext(hits);
RpcNodeConnection rpcNode = ((RpcNodeConnection) node);
rpcNode.invokeAsync(request, timeoutSeconds, new RpcResponseWaiter(rpcNode, responseReceiver));
}
private static class RpcNodeConnection implements NodeConnection {
// Information about the connected node
private final Supervisor supervisor;
private final String hostname;
private final int port;
private final String description;
// The current shared connection. This will be recycled when it becomes invalid.
// All access to this must be synchronized
private Target target = null;
public RpcNodeConnection(String hostname, int port, Supervisor supervisor) {
this.supervisor = supervisor;
this.hostname = hostname;
this.port = port;
description = "rpc node connection to " + hostname + ":" + port;
}
public void invokeAsync(Request req, double timeout, RequestWaiter waiter) {
// TODO: Consider replacing this by a watcher on the target
synchronized(this) { // ensure we have exactly 1 valid connection across threads
if (target == null || ! target.isValid())
target = supervisor.connect(new Spec(hostname, port));
}
target.invokeAsync(req, timeout, waiter);
}
@Override
public void close() {
target.close();
}
@Override
public String toString() {
return description;
}
}
private static class RpcResponseWaiter implements RequestWaiter {
/** The node to which we made the request we are waiting for - for error messages only */
private final RpcNodeConnection node;
/** The handler to which the response is forwarded */
private final Dispatcher.GetDocsumsResponseReceiver handler;
public RpcResponseWaiter(RpcNodeConnection node, Dispatcher.GetDocsumsResponseReceiver handler) {
this.node = node;
this.handler = handler;
}
@Override
public void handleRequestDone(Request requestWithResponse) {
if (requestWithResponse.isError()) {
handler.receive(GetDocsumsResponseOrError.fromError("Error response from " + node + ": " +
requestWithResponse.errorMessage()));
return;
}
Values returnValues = requestWithResponse.returnValues();
if (returnValues.size() < 3) {
handler.receive(GetDocsumsResponseOrError.fromError("Invalid getDocsums response from " + node +
": Expected 3 return arguments, got " +
returnValues.size()));
return;
}
byte compression = returnValues.get(0).asInt8();
int uncompressedSize = returnValues.get(1).asInt32();
byte[] compressedSlimeBytes = returnValues.get(2).asData();
List<FastHit> hits = (List<FastHit>) requestWithResponse.getContext();
handler.receive(GetDocsumsResponseOrError.fromResponse(new GetDocsumsResponse(compression,
uncompressedSize,
compressedSlimeBytes,
hits)));
}
}
}
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