| /* |
| * Copyright 2018-present Open Networking Foundation |
| * |
| * 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.flow.impl; |
| |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| import com.google.common.collect.Maps; |
| import org.onosproject.core.ApplicationId; |
| import org.onosproject.net.flow.DefaultFlowEntry; |
| import org.onosproject.net.flow.FlowEntry; |
| import org.onosproject.net.flow.FlowId; |
| import org.onosproject.net.flow.FlowRule; |
| import org.onosproject.net.flow.StoredFlowEntry; |
| import org.onosproject.store.LogicalTimestamp; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Container for a bucket of flows assigned to a specific device. |
| * <p> |
| * The bucket is mutable. When changes are made to the bucket, the term and timestamp in which the change |
| * occurred is recorded for ordering changes. |
| */ |
| public class FlowBucket { |
| private static final Logger LOGGER = LoggerFactory.getLogger(FlowBucket.class); |
| private final BucketId bucketId; |
| private volatile long term; |
| private volatile LogicalTimestamp timestamp; |
| private final Map<FlowId, Map<StoredFlowEntry, StoredFlowEntry>> flowBucket; |
| |
| FlowBucket(BucketId bucketId) { |
| this(bucketId, 0, new LogicalTimestamp(0), Maps.newConcurrentMap()); |
| } |
| |
| private FlowBucket( |
| BucketId bucketId, |
| long term, |
| LogicalTimestamp timestamp, |
| Map<FlowId, Map<StoredFlowEntry, StoredFlowEntry>> flowBucket) { |
| this.bucketId = bucketId; |
| this.term = term; |
| this.timestamp = timestamp; |
| this.flowBucket = flowBucket; |
| } |
| |
| /** |
| * Returns the flow bucket identifier. |
| * |
| * @return the flow bucket identifier |
| */ |
| public BucketId bucketId() { |
| return bucketId; |
| } |
| |
| /** |
| * Returns the flow bucket term. |
| * |
| * @return the flow bucket term |
| */ |
| public long term() { |
| return term; |
| } |
| |
| /** |
| * Returns the flow bucket timestamp. |
| * |
| * @return the flow bucket timestamp |
| */ |
| public LogicalTimestamp timestamp() { |
| return timestamp; |
| } |
| |
| /** |
| * Returns the digest for the bucket. |
| * |
| * @return the digest for the bucket |
| */ |
| public FlowBucketDigest getDigest() { |
| return new FlowBucketDigest(bucketId().bucket(), term(), timestamp()); |
| } |
| |
| /** |
| * Returns the flow entries in the bucket. |
| * |
| * @return the flow entries in the bucket |
| */ |
| public Map<FlowId, Map<StoredFlowEntry, StoredFlowEntry>> getFlowBucket() { |
| return flowBucket; |
| } |
| |
| /** |
| * Returns the flow entries for the given flow. |
| * |
| * @param flowId the flow identifier |
| * @return the flows for the given flow ID |
| */ |
| public Map<StoredFlowEntry, StoredFlowEntry> getFlowEntries(FlowId flowId) { |
| Map<StoredFlowEntry, StoredFlowEntry> flowEntries = flowBucket.get(flowId); |
| return flowEntries != null ? flowEntries : flowBucket.computeIfAbsent(flowId, id -> Maps.newConcurrentMap()); |
| } |
| |
| /** |
| * Counts the flows in the bucket. |
| * |
| * @return the number of flows in the bucket |
| */ |
| public int count() { |
| return flowBucket.values() |
| .stream() |
| .mapToInt(entry -> entry.values().size()) |
| .sum(); |
| } |
| |
| /** |
| * Returns a new copy of the flow bucket. |
| * |
| * @return a new copy of the flow bucket |
| */ |
| FlowBucket copy() { |
| return new FlowBucket( |
| bucketId, |
| term, |
| timestamp, |
| flowBucket.entrySet() |
| .stream() |
| .map(e -> Maps.immutableEntry(e.getKey(), Maps.newHashMap(e.getValue()))) |
| .collect(Collectors.toMap(e -> e.getKey(), e -> e.getValue()))); |
| } |
| |
| /** |
| * Records an update to the bucket. |
| */ |
| private void recordUpdate(long term, LogicalTimestamp timestamp) { |
| this.term = term; |
| this.timestamp = timestamp; |
| } |
| |
| /** |
| * Adds the given flow rule to the bucket. |
| * |
| * @param rule the rule to add |
| * @param term the term in which the change occurred |
| * @param clock the logical clock |
| */ |
| public void add(FlowEntry rule, long term, LogicalClock clock) { |
| Map<StoredFlowEntry, StoredFlowEntry> flowEntries = flowBucket.get(rule.id()); |
| if (flowEntries == null) { |
| flowEntries = flowBucket.computeIfAbsent(rule.id(), id -> Maps.newConcurrentMap()); |
| } |
| flowEntries.put((StoredFlowEntry) rule, (StoredFlowEntry) rule); |
| recordUpdate(term, clock.getTimestamp()); |
| } |
| |
| /** |
| * Updates the given flow rule in the bucket. |
| * |
| * @param rule the rule to update |
| * @param term the term in which the change occurred |
| * @param clock the logical clock |
| */ |
| public void update(FlowEntry rule, long term, LogicalClock clock) { |
| Map<StoredFlowEntry, StoredFlowEntry> flowEntries = flowBucket.get(rule.id()); |
| if (flowEntries == null) { |
| flowEntries = flowBucket.computeIfAbsent(rule.id(), id -> Maps.newConcurrentMap()); |
| } |
| flowEntries.computeIfPresent((StoredFlowEntry) rule, (k, stored) -> { |
| if (rule instanceof DefaultFlowEntry) { |
| DefaultFlowEntry updated = (DefaultFlowEntry) rule; |
| if (stored instanceof DefaultFlowEntry) { |
| DefaultFlowEntry storedEntry = (DefaultFlowEntry) stored; |
| if (updated.created() >= storedEntry.created()) { |
| recordUpdate(term, clock.getTimestamp()); |
| return updated; |
| } else { |
| LOGGER.debug("Trying to update more recent flow entry {} (stored: {})", updated, stored); |
| return stored; |
| } |
| } |
| } |
| return stored; |
| }); |
| } |
| |
| /** |
| * Applies the given update function to the rule. |
| * |
| * @param rule the rule to update |
| * @param function the update function to apply |
| * @param term the term in which the change occurred |
| * @param clock the logical clock |
| * @param <T> the result type |
| * @return the update result or {@code null} if the rule was not updated |
| */ |
| public <T> T update(FlowRule rule, Function<StoredFlowEntry, T> function, long term, LogicalClock clock) { |
| Map<StoredFlowEntry, StoredFlowEntry> flowEntries = flowBucket.get(rule.id()); |
| if (flowEntries == null) { |
| flowEntries = flowBucket.computeIfAbsent(rule.id(), id -> Maps.newConcurrentMap()); |
| } |
| |
| AtomicReference<T> resultRef = new AtomicReference<>(); |
| flowEntries.computeIfPresent(new DefaultFlowEntry(rule), (k, stored) -> { |
| if (stored != null) { |
| T result = function.apply(stored); |
| if (result != null) { |
| recordUpdate(term, clock.getTimestamp()); |
| resultRef.set(result); |
| } |
| } |
| return stored; |
| }); |
| return resultRef.get(); |
| } |
| |
| /** |
| * Removes the given flow rule from the bucket. |
| * |
| * @param rule the rule to remove |
| * @param term the term in which the change occurred |
| * @param clock the logical clock |
| * @return the removed flow entry |
| */ |
| public FlowEntry remove(FlowEntry rule, long term, LogicalClock clock) { |
| final AtomicReference<FlowEntry> removedRule = new AtomicReference<>(); |
| flowBucket.computeIfPresent(rule.id(), (flowId, flowEntries) -> { |
| flowEntries.computeIfPresent((StoredFlowEntry) rule, (k, stored) -> { |
| if (rule instanceof DefaultFlowEntry) { |
| DefaultFlowEntry toRemove = (DefaultFlowEntry) rule; |
| if (stored instanceof DefaultFlowEntry) { |
| DefaultFlowEntry storedEntry = (DefaultFlowEntry) stored; |
| if (toRemove.created() < storedEntry.created()) { |
| LOGGER.debug("Trying to remove more recent flow entry {} (stored: {})", toRemove, stored); |
| // the key is not updated, removedRule remains null |
| return stored; |
| } |
| } |
| } |
| removedRule.set(stored); |
| return null; |
| }); |
| return flowEntries.isEmpty() ? null : flowEntries; |
| }); |
| |
| if (removedRule.get() != null) { |
| recordUpdate(term, clock.getTimestamp()); |
| return removedRule.get(); |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * Purges the bucket. |
| */ |
| public void purge() { |
| flowBucket.clear(); |
| } |
| |
| /** |
| * Purge the entries with the given application ID. |
| * |
| * @param appId the application ID |
| * @param term the term in which the purge occurred |
| * @param clock the logical clock |
| */ |
| public void purge(ApplicationId appId, long term, LogicalClock clock) { |
| boolean anythingRemoved = flowBucket.values().removeIf(flowEntryMap -> { |
| flowEntryMap.values().removeIf(storedFlowEntry -> storedFlowEntry.appId() == appId.id()); |
| return flowEntryMap.isEmpty(); |
| }); |
| if (anythingRemoved) { |
| recordUpdate(term, clock.getTimestamp()); |
| } |
| } |
| |
| |
| /** |
| * Clears the bucket. |
| */ |
| public void clear() { |
| term = 0; |
| timestamp = new LogicalTimestamp(0); |
| flowBucket.clear(); |
| } |
| } |