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/*
* Copyright 2014-2015 Open Networking Laboratory
*
* Licensed 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 org.onosproject.store.trivial;
import com.google.common.collect.Sets;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Service;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.PortNumber;
import org.onosproject.net.flow.FlowEntry;
import org.onosproject.net.flow.FlowRule;
import org.onosproject.net.flow.instructions.Instruction;
import org.onosproject.net.flow.instructions.Instructions;
import org.onosproject.net.statistic.StatisticStore;
import org.slf4j.Logger;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Maintains statistics using RPC calls to collect stats from remote instances
* on demand.
*/
@Component(immediate = true)
@Service
public class SimpleStatisticStore implements StatisticStore {
private final Logger log = getLogger(getClass());
private Map<ConnectPoint, InternalStatisticRepresentation>
representations = new ConcurrentHashMap<>();
private Map<ConnectPoint, Set<FlowEntry>> previous = new ConcurrentHashMap<>();
private Map<ConnectPoint, Set<FlowEntry>> current = new ConcurrentHashMap<>();
@Activate
public void activate() {
log.info("Started");
}
@Deactivate
public void deactivate() {
log.info("Stopped");
}
@Override
public void prepareForStatistics(FlowRule rule) {
ConnectPoint cp = buildConnectPoint(rule);
if (cp == null) {
return;
}
InternalStatisticRepresentation rep;
synchronized (representations) {
rep = getOrCreateRepresentation(cp);
}
rep.prepare();
}
@Override
public synchronized void removeFromStatistics(FlowRule rule) {
ConnectPoint cp = buildConnectPoint(rule);
if (cp == null) {
return;
}
InternalStatisticRepresentation rep = representations.get(cp);
if (rep != null && rep.remove(rule)) {
updatePublishedStats(cp, Collections.emptySet());
}
Set<FlowEntry> values = current.get(cp);
if (values != null) {
values.remove(rule);
}
values = previous.get(cp);
if (values != null) {
values.remove(rule);
}
}
@Override
public void addOrUpdateStatistic(FlowEntry rule) {
ConnectPoint cp = buildConnectPoint(rule);
if (cp == null) {
return;
}
InternalStatisticRepresentation rep = representations.get(cp);
if (rep != null && rep.submit(rule)) {
updatePublishedStats(cp, rep.get());
}
}
private synchronized void updatePublishedStats(ConnectPoint cp,
Set<FlowEntry> flowEntries) {
Set<FlowEntry> curr = current.get(cp);
if (curr == null) {
curr = new HashSet<>();
}
previous.put(cp, curr);
current.put(cp, flowEntries);
}
@Override
public Set<FlowEntry> getCurrentStatistic(ConnectPoint connectPoint) {
return getCurrentStatisticInternal(connectPoint);
}
private synchronized Set<FlowEntry> getCurrentStatisticInternal(ConnectPoint connectPoint) {
return current.get(connectPoint);
}
@Override
public Set<FlowEntry> getPreviousStatistic(ConnectPoint connectPoint) {
return getPreviousStatisticInternal(connectPoint);
}
private synchronized Set<FlowEntry> getPreviousStatisticInternal(ConnectPoint connectPoint) {
return previous.get(connectPoint);
}
private InternalStatisticRepresentation getOrCreateRepresentation(ConnectPoint cp) {
if (representations.containsKey(cp)) {
return representations.get(cp);
} else {
InternalStatisticRepresentation rep = new InternalStatisticRepresentation();
representations.put(cp, rep);
return rep;
}
}
private ConnectPoint buildConnectPoint(FlowRule rule) {
PortNumber port = getOutput(rule);
if (port == null) {
return null;
}
ConnectPoint cp = new ConnectPoint(rule.deviceId(), port);
return cp;
}
private PortNumber getOutput(FlowRule rule) {
for (Instruction i : rule.treatment().immediate()) {
if (i.type() == Instruction.Type.OUTPUT) {
Instructions.OutputInstruction out = (Instructions.OutputInstruction) i;
return out.port();
}
if (i.type() == Instruction.Type.DROP) {
return PortNumber.P0;
}
}
return null;
}
private class InternalStatisticRepresentation {
private final AtomicInteger counter = new AtomicInteger(0);
private final Set<FlowEntry> rules = new HashSet<>();
public void prepare() {
counter.incrementAndGet();
}
public synchronized boolean remove(FlowRule rule) {
rules.remove(rule);
return counter.decrementAndGet() == 0;
}
public synchronized boolean submit(FlowEntry rule) {
if (rules.contains(rule)) {
rules.remove(rule);
}
rules.add(rule);
if (counter.get() == 0) {
return true;
} else {
return counter.decrementAndGet() == 0;
}
}
public synchronized Set<FlowEntry> get() {
counter.set(rules.size());
return Sets.newHashSet(rules);
}
}
}
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