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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 <vespa/storage/distributor/operations/operation.h>
#include <vespa/storage/distributor/operation_sequencer.h>
#include <memory>
namespace storage::distributor {
class PendingMessageTracker;
class VisitorOperation;
class OperationOwner;
class UuidGenerator;
/**
* Operation starting indirection for a visitor operation that has the semantics
* of an exclusive bucket lock. Such operations can only resolve to a single
* super-bucket/sub-bucket pair and care should be taken to avoid starving client
* operations through long-running locks.
*
* Operation starting may be deferred to the PendingMessageTracker if there are
* pending operations to the sub-bucket when onStart is called. If so, the deferred
* operation start takes place automatically and immediately when all pending
* bucket operations have completed. These will be started in the context of the
* OperationOwner provided to the operation.
*/
class ReadForWriteVisitorOperationStarter
: public Operation,
public std::enable_shared_from_this<ReadForWriteVisitorOperationStarter>
{
std::shared_ptr<VisitorOperation> _visitor_op;
OperationSequencer& _operation_sequencer;
OperationOwner& _stable_operation_owner;
PendingMessageTracker& _message_tracker;
UuidGenerator& _uuid_generator;
public:
ReadForWriteVisitorOperationStarter(std::shared_ptr<VisitorOperation> visitor_op,
OperationSequencer& operation_sequencer,
OperationOwner& stable_operation_owner,
PendingMessageTracker& message_tracker,
UuidGenerator& uuid_generator);
~ReadForWriteVisitorOperationStarter() override;
const char* getName() const noexcept override { return "ReadForWriteVisitorOperationStarter"; }
void onClose(DistributorStripeMessageSender& sender) override;
void onStart(DistributorStripeMessageSender& sender) override;
void onReceive(DistributorStripeMessageSender& sender,
const std::shared_ptr<api::StorageReply> & msg) override;
private:
bool bucket_has_pending_merge(const document::Bucket&, const PendingMessageTracker& tracker) const;
};
}
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