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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.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;
/**
* A client which uses rpc request to search nodes to implement the Client API.
*
* @author bratseth
*/
public class RpcClient implements Client {
private final Supervisor supervisor;
public RpcClient(String name, int transportThreads) {
supervisor = new Supervisor(new Transport(name, transportThreads));
}
@Override
public void close() {
supervisor.transport().shutdown().join();
}
@Override
public NodeConnection createConnection(String hostname, int port) {
return new RpcNodeConnection(hostname, port, supervisor);
}
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;
public RpcNodeConnection(String hostname, int port, Supervisor supervisor) {
this.supervisor = supervisor;
this.hostname = hostname;
this.port = port;
description = "rpc node connection to " + hostname + ":" + port;
target = supervisor.connect(new Spec(hostname, port));
}
@Override
public void request(String rpcMethod, CompressionType compression, int uncompressedLength, byte[] compressedPayload,
ResponseReceiver responseReceiver, double timeoutSeconds) {
Request request = new Request(rpcMethod);
request.parameters().add(new Int8Value(compression.getCode()));
request.parameters().add(new Int32Value(uncompressedLength));
request.parameters().add(new DataValue(compressedPayload));
invokeAsync(request, timeoutSeconds, new RpcProtobufResponseWaiter(this, responseReceiver));
}
private 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.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 RpcProtobufResponseWaiter 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 ResponseReceiver handler;
public RpcProtobufResponseWaiter(RpcNodeConnection node, ResponseReceiver handler) {
this.node = node;
this.handler = handler;
}
@Override
public void handleRequestDone(Request requestWithResponse) {
if (requestWithResponse.isError()) {
handler.receive(ResponseOrError.fromError("Error response from " + node + ": " + requestWithResponse.errorMessage()));
return;
}
Values returnValues = requestWithResponse.returnValues();
if (returnValues.size() < 3) {
handler.receive(ResponseOrError.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[] compressedPayload = returnValues.get(2).asData();
handler.receive(ResponseOrError.fromResponse(new ProtobufResponse(compression, uncompressedSize, compressedPayload)));
}
}
}
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