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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.prelude.fastsearch.FastHit;
import java.util.List;
import java.util.Optional;
/**
* A dispatch client.
*
* @author bratseth
*/
interface Client {
/** Creates a connection to a particular node in this */
NodeConnection createConnection(String hostname, int port);
void close();
interface ResponseReceiver {
void receive(ResponseOrError<ProtobufResponse> response);
}
class ResponseOrError<T> {
final Optional<T> response;
final Optional<String> error;
public static <T> ResponseOrError<T> fromResponse(T response) {
return new ResponseOrError<>(response);
}
public static <T> ResponseOrError<T> fromError(String error) {
return new ResponseOrError<T>(error);
}
ResponseOrError(T response) {
this.response = Optional.of(response);
this.error = Optional.empty();
}
ResponseOrError(String error) {
this.response = Optional.empty();
this.error = Optional.of(error);
}
/** Returns the response, or empty if there is an error */
public Optional<T> response() { return response; }
/** Returns the error or empty if there is a response */
public Optional<String> error() { return error; }
}
class GetDocsumsResponse {
private final byte compression;
private final int uncompressedSize;
private final byte[] compressedSlimeBytes;
private final List<FastHit> hitsContext;
public GetDocsumsResponse(byte compression, int uncompressedSize, byte[] compressedSlimeBytes, List<FastHit> hitsContext) {
this.compression = compression;
this.uncompressedSize = uncompressedSize;
this.compressedSlimeBytes = compressedSlimeBytes;
this.hitsContext = hitsContext;
}
public byte compression() {
return compression;
}
public int uncompressedSize() {
return uncompressedSize;
}
public byte[] compressedSlimeBytes() {
return compressedSlimeBytes;
}
public List<FastHit> hitsContext() {
return hitsContext;
}
}
interface NodeConnection {
void request(String rpcMethod, CompressionType compression, int uncompressedLength, byte[] compressedPayload,
ResponseReceiver responseReceiver, double timeoutSeconds);
/** Closes this connection */
void close();
}
class ProtobufResponse {
private final byte compression;
private final int uncompressedSize;
private final byte[] compressedPayload;
public ProtobufResponse(byte compression, int uncompressedSize, byte[] compressedPayload) {
this.compression = compression;
this.uncompressedSize = uncompressedSize;
this.compressedPayload = compressedPayload;
}
public byte compression() {
return compression;
}
public int uncompressedSize() {
return uncompressedSize;
}
public byte[] compressedPayload() {
return compressedPayload;
}
}
}
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