Golang keys.SequenceCacheKeyPrefix函数代码示例

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本文整理汇总了Golang中github.com/cockroachdb/cockroach/keys.SequenceCacheKeyPrefix函数的典型用法代码示例。如果您正苦于以下问题：Golang SequenceCacheKeyPrefix函数的具体用法？Golang SequenceCacheKeyPrefix怎么用？Golang SequenceCacheKeyPrefix使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了SequenceCacheKeyPrefix函数的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: Get

// Get looks up the latest sequence number recorded for this transaction ID.
// The latest entry is that with the highest epoch (and then, highest
// sequence). On a miss, zero is returned for both. If an entry is found and a
// SequenceCacheEntry is provided, it is populated from the found value.
func (sc *SequenceCache) Get(e engine.Engine, id []byte, dest *roachpb.SequenceCacheEntry) (uint32, uint32, error) {
	if len(id) == 0 {
		return 0, 0, errEmptyTxnID
	}

	// Pull response from disk and read into reply if available. Sequence
	// number sorts in decreasing order, so this gives us the largest entry or
	// an entry which isn't ours. To avoid encoding an end key for the scan,
	// we just scan and check via a simple prefix check whether we read a
	// key for "our" cache id.
	prefix := keys.SequenceCacheKeyPrefix(sc.rangeID, id)
	kvs, _, err := engine.MVCCScan(e, prefix, sc.max, 1, /* num */
		roachpb.ZeroTimestamp, true /* consistent */, nil /* txn */)
	if err != nil || len(kvs) == 0 || !bytes.HasPrefix(kvs[0].Key, prefix) {
		return 0, 0, err
	}
	_, epoch, seq, err := decodeSequenceCacheKey(kvs[0].Key, sc.scratchBuf[:0])
	if err != nil {
		return 0, 0, err
	}
	if dest != nil {
		dest.Reset()
		// Caller wants to have the unmarshaled value.
		if err := kvs[0].Value.GetProto(dest); err != nil {
			return 0, 0, err
		}
	}
	return epoch, seq, nil
}

开发者ID:billhongs，项目名称:cockroach，代码行数:33，代码来源:sequence_cache.go

示例2: GetAllTransactionID

// GetAllTransactionID returns all the key-value pairs for the given transaction ID from
// the engine.
func (sc *SequenceCache) GetAllTransactionID(e engine.Engine, id []byte) ([]roachpb.KeyValue, error) {
	prefix := keys.SequenceCacheKeyPrefix(sc.rangeID, id)
	kvs, _, err := engine.MVCCScan(e, prefix, prefix.PrefixEnd(), 0, /* max */
		roachpb.ZeroTimestamp, true /* consistent */, nil /* txn */)
	return kvs, err
}

开发者ID:billhongs，项目名称:cockroach，代码行数:8，代码来源:sequence_cache.go

示例3: Del

// Del removes all sequence cache entries for the given transaction.
func (sc *SequenceCache) Del(e engine.Engine, ms *engine.MVCCStats, txnID *uuid.UUID) error {
	startKey := keys.SequenceCacheKeyPrefix(sc.rangeID, txnID)
	_, err := engine.MVCCDeleteRange(e, ms, startKey, startKey.PrefixEnd(), 0 /* max */, roachpb.ZeroTimestamp, nil /* txn */, false /*returnKeys*/)
	return err
}

开发者ID:bogdanbatog，项目名称:cockroach，代码行数:6，代码来源:sequence_cache.go

注：本文中的github.com/cockroachdb/cockroach/keys.SequenceCacheKeyPrefix函数示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。