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conn_pool.go
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conn_pool.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package runtime
import (
"context"
)
import (
gxnet "github.com/dubbogo/gost/net"
)
import (
"github.com/arana-db/arana/pkg/mysql"
"github.com/arana-db/arana/third_party/pools"
)
type BackendResourcePool pools.ResourcePool
// Get will return the next available resource and convert to mysql.BackendConnection.
// If available less than 1, it will make capacity increase by 1.
// If the net connection check failure, it will take again.
func (bcp *BackendResourcePool) Get(ctx context.Context) (*mysql.BackendConnection, error) {
rp := (*pools.ResourcePool)(bcp)
if rp.Available() < 1 {
_ = rp.SetCapacity(int(rp.Capacity()) + 1)
}
res, err := rp.Get(ctx)
if err != nil {
return nil, err
}
conn := res.(*mysql.BackendConnection).GetDatabaseConn()
if err = gxnet.ConnCheck(conn.GetNetConn()); err != nil {
rp.Put(nil)
// Tolerate a fetch failure.
res, err = rp.Get(ctx)
if err != nil {
return nil, err
}
}
return res.(*mysql.BackendConnection), nil
}