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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/document/bucket/bucketid.h>
#include <vespa/vespalib/util/time.h>
namespace storage::distributor {
/**
* Semantics are basically as follows:
* We divide the timeline into periods based on the configured check
* interval, with each bucket having a start point in this period
* based on its hash. If the current time is at least that of the start
* point and the bucket has not been checked after this point, it is
* scheduled for GC. Otherwise, the bucket is checked iff there
* has been at least one missed start point in a previous period.
*
* If the check period is zero, this is considered to mean GC is disabled.
*/
class BucketGcTimeCalculator
{
public:
class BucketIdHasher {
virtual size_t doHash(const document::BucketId&) const noexcept = 0;
public:
virtual ~BucketIdHasher() = default;
size_t hash(const document::BucketId& b) const noexcept { return doHash(b); }
};
class BucketIdIdentityHasher : public BucketIdHasher {
size_t doHash(const document::BucketId& b) const noexcept override {
return b.getId();
}
};
BucketGcTimeCalculator(const BucketIdHasher& hasher,
vespalib::duration checkInterval)
: _hasher(hasher),
_checkInterval(checkInterval)
{
}
bool shouldGc(const document::BucketId&,
vespalib::duration currentTime,
vespalib::duration lastRunAt) const;
private:
const BucketIdHasher& _hasher;
vespalib::duration _checkInterval;
};
}
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