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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vector>
#include <vespa/document/bucket/bucket.h>
#include <vespa/storageapi/buckets/bucketinfo.h>
#include <vespa/storage/common/messagesender.h>
#include <vespa/storage/common/servicelayercomponent.h>
namespace storage {
class BucketOwnershipNotifier
{
const ServiceLayerComponent & _component;
MessageSender & _sender;
public:
BucketOwnershipNotifier(const ServiceLayerComponent& component, MessageSender& sender)
: _component(component),
_sender(sender)
{}
bool distributorOwns(uint16_t distributor, const document::Bucket &bucket) const;
void notifyIfOwnershipChanged(const document::Bucket &bucket, uint16_t sourceIndex, const api::BucketInfo& infoToSend);
void sendNotifyBucketToCurrentOwner(const document::Bucket &bucket, const api::BucketInfo& infoToSend);
private:
enum IndexMeta {
FAILED_TO_RESOLVE = 0xffff
};
void sendNotifyBucketToDistributor(uint16_t distributorIndex, const document::Bucket &bucket,
const api::BucketInfo& infoToSend);
// Returns either index or FAILED_TO_RESOLVE
uint16_t getOwnerDistributorForBucket(const document::Bucket &bucket) const;
void logNotification(const document::Bucket &bucket, uint16_t sourceIndex,
uint16_t currentOwnerIndex, const api::BucketInfo& newInfo);
};
/**
* Convenience class for sending notifications at the end of a scope, primarily
* to avoid issues with sending while holding a bucket lock.
*/
class NotificationGuard
{
struct BucketToCheck
{
BucketToCheck(const document::Bucket& _bucket, uint16_t _sourceIndex, const api::BucketInfo& _info)
: bucket(_bucket),
info(_info),
sourceIndex(_sourceIndex),
alwaysSend(false)
{}
document::Bucket bucket;
api::BucketInfo info;
uint16_t sourceIndex;
bool alwaysSend;
};
BucketOwnershipNotifier& _notifier;
std::vector<BucketToCheck> _bucketsToCheck;
public:
NotificationGuard(BucketOwnershipNotifier& notifier)
: _notifier(notifier),
_bucketsToCheck()
{}
NotificationGuard(const NotificationGuard&) = delete;
NotificationGuard& operator=(const NotificationGuard&) = delete;
~NotificationGuard();
void notifyIfOwnershipChanged(const document::Bucket &bucket, uint16_t sourceIndex, const api::BucketInfo& infoToSend);
void notifyAlways(const document::Bucket &bucket, const api::BucketInfo& infoToSend);
};
} // storage
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