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allocator.go
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allocator.go
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/*
* Copyright (C) 2016 Red Hat, Inc.
*
* 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 flow
import (
"encoding/json"
"sync"
"time"
)
type TableAllocator struct {
sync.RWMutex
update time.Duration
updateWindow time.Duration
expire time.Duration
expireWindow time.Duration
tables map[*Table]bool
}
func (a *TableAllocator) Flush() {
a.RLock()
defer a.RUnlock()
for table := range a.tables {
table.Flush()
}
}
func (a *TableAllocator) aggregateReplies(query *TableQuery, replies []*TableReply) *TableReply {
switch query.Obj.(type) {
case *FlowSearchQuery:
flowSearchReplies := make([]json.RawMessage, 0)
for _, reply := range replies {
if reply.Status != 200 {
continue
}
flowSearchReplies = append(flowSearchReplies, reply.Obj)
}
b, _ := json.Marshal(flowSearchReplies)
raw := json.RawMessage(b)
return &TableReply{
Status: 200,
Obj: raw,
}
}
return &TableReply{
Status: 500,
}
}
func (a *TableAllocator) QueryTable(query *TableQuery) *TableReply {
a.RLock()
defer a.RUnlock()
var replies []*TableReply
for table := range a.tables {
reply := table.Query(query)
if reply != nil {
replies = append(replies, reply)
}
}
return a.aggregateReplies(query, replies)
}
func (a *TableAllocator) Alloc(flowCallBack ExpireUpdateFunc) *Table {
a.Lock()
defer a.Unlock()
updateHandler := NewFlowHandler(flowCallBack, a.update, a.update)
expireHandler := NewFlowHandler(flowCallBack, a.expire, a.expire)
t := NewTable(updateHandler, expireHandler)
a.tables[t] = true
return t
}
func (a *TableAllocator) Release(t *Table) {
a.Lock()
delete(a.tables, t)
a.Unlock()
}
func NewTableAllocator(update, updateWindow, expire, expireWindow time.Duration) *TableAllocator {
return &TableAllocator{
update: update,
updateWindow: updateWindow,
expire: expire,
expireWindow: expireWindow,
tables: make(map[*Table]bool),
}
}