102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
package cache
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import (
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"github.com/jmhodges/levigo"
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"github.com/omniscale/imposm3/cache/binary"
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"github.com/omniscale/imposm3/element"
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)
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type RelationsCache struct {
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cache
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}
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func newRelationsCache(path string) (*RelationsCache, error) {
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cache := RelationsCache{}
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cache.options = &globalCacheOptions.Relations
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err := cache.open(path)
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if err != nil {
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return nil, err
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}
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return &cache, err
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}
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func (p *RelationsCache) PutRelation(relation *element.Relation) error {
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if relation.Id == SKIP {
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return nil
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}
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keyBuf := idToKeyBuf(relation.Id)
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data, err := binary.MarshalRelation(relation)
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if err != nil {
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return err
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}
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return p.db.Put(p.wo, keyBuf, data)
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}
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func (p *RelationsCache) PutRelations(rels []element.Relation) error {
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batch := levigo.NewWriteBatch()
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defer batch.Close()
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for _, rel := range rels {
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if rel.Id == SKIP {
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continue
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}
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if len(rel.Tags) == 0 {
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continue
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}
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keyBuf := idToKeyBuf(rel.Id)
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data, err := binary.MarshalRelation(&rel)
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if err != nil {
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return err
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}
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batch.Put(keyBuf, data)
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}
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return p.db.Write(p.wo, batch)
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}
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func (p *RelationsCache) Iter() chan *element.Relation {
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rels := make(chan *element.Relation)
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go func() {
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ro := levigo.NewReadOptions()
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ro.SetFillCache(false)
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it := p.db.NewIterator(ro)
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// we need to Close the iter before closing the
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// chan (and thus signaling that we are done)
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// to avoid race where db is closed before the iterator
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defer close(rels)
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defer it.Close()
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it.SeekToFirst()
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for ; it.Valid(); it.Next() {
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rel, err := binary.UnmarshalRelation(it.Value())
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if err != nil {
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panic(err)
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}
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rel.Id = idFromKeyBuf(it.Key())
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rels <- rel
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}
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}()
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return rels
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}
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func (p *RelationsCache) GetRelation(id int64) (*element.Relation, error) {
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keyBuf := idToKeyBuf(id)
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data, err := p.db.Get(p.ro, keyBuf)
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if err != nil {
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return nil, err
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}
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if data == nil {
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return nil, NotFound
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}
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relation, err := binary.UnmarshalRelation(data)
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if err != nil {
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return nil, err
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}
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relation.Id = id
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return relation, err
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}
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func (p *RelationsCache) DeleteRelation(id int64) error {
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keyBuf := idToKeyBuf(id)
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return p.db.Delete(p.wo, keyBuf)
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}
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