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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.fs4;
import java.nio.ByteBuffer;
import java.util.Optional;
/**
* A pong packet for FS4. It maps to PCODE_MONITORRESULTX
* in the C++ implementation of the protocol.
*
* @author Steinar Knutsen
*/
public class PongPacket extends BasicPacket {
@SuppressWarnings("unused")
private int lowPartitionId; // ignored (historical field)
private int dispatchTimestamp;
@SuppressWarnings("unused")
private int totalNodes; // configured nodes
private Optional<Integer> activeNodes = Optional.empty(); // number of nodes that are up
@SuppressWarnings("unused")
private int totalPartitions; // configured partitions
private Optional<Integer> activePartitions = Optional.empty(); // number of partitions that are up
private Optional<Long> activeDocuments = Optional.empty(); // how many documents are searchable (sum)
public PongPacket() {
}
/** For testing */
public PongPacket(long activeDocuments) {
this.activeDocuments = Optional.of(activeDocuments);
}
private int code;
protected void codeDecodedHook(int code) { this.code = code; }
public int getCode() { return code; }
public void decodeBody(ByteBuffer buffer) {
int features = buffer.getInt();
lowPartitionId = buffer.getInt();
dispatchTimestamp = buffer.getInt();
if ((features & MRF_MLD) != 0) {
totalNodes = buffer.getInt();
activeNodes = Optional.of(buffer.getInt());
totalPartitions = buffer.getInt();
activePartitions = Optional.of(buffer.getInt());
}
if ((features & MRF_RFLAGS) != 0) {
buffer.getInt(); // ignore rflags (historical field)
}
if ((features & MRF_ACTIVEDOCS) != 0) {
activeDocuments = Optional.of(Long.valueOf(buffer.getLong()));
}
}
public static PongPacket create() {
return new PongPacket();
}
/**
* Return current docstamp for backend to make cache invalidation
* possible.
* */
public int getDocstamp() {
return dispatchTimestamp;
}
/**
* retrieve the reported number of active (searchable) documents
* in the monitored backend.
**/
public Optional<Long> getActiveDocuments() {
return activeDocuments;
}
public Optional<Integer> getActiveNodes() {
return activeNodes;
}
public Optional<Integer> getActivePartitions() {
return activePartitions;
}
/** feature bits, taken from searchlib/common/transport.h */
static final int MRF_MLD = 0x00000001;
static final int MRF_RFLAGS = 0x00000008;
static final int MRF_ACTIVEDOCS = 0x00000010;
/** packet codes, taken from searchlib/common/transport.h */
static final int PCODE_MONITORRESULTX = 221;
}
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