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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.sdnip;
import static java.util.concurrent.Executors.newSingleThreadExecutor;
import static org.onlab.util.Tools.groupedThreads;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import org.onosproject.core.ApplicationId;
import org.onosproject.net.intent.Intent;
import org.onosproject.net.intent.IntentService;
import org.onosproject.net.intent.IntentState;
import org.onosproject.net.intent.Key;
import org.onosproject.routing.IntentSynchronizationService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Synchronizes intents between the in-memory intent store and the
* IntentService.
*/
public class IntentSynchronizer implements IntentSynchronizationService {
private static final Logger log =
LoggerFactory.getLogger(IntentSynchronizer.class);
private final ApplicationId appId;
private final IntentService intentService;
private final Map<Key, Intent> intents;
//
// State to deal with the Leader election and pushing Intents
//
private final ExecutorService intentsSynchronizerExecutor;
private volatile boolean isElectedLeader = false;
private volatile boolean isActivatedLeader = false;
/**
* Class constructor.
*
* @param appId the Application ID
* @param intentService the intent service
*/
public IntentSynchronizer(ApplicationId appId, IntentService intentService) {
this(appId, intentService,
newSingleThreadExecutor(groupedThreads("onos/" + appId, "sync")));
}
/**
* Class constructor.
*
* @param appId the Application ID
* @param intentService the intent service
* @param executorService executor service for synchronization thread
*/
IntentSynchronizer(ApplicationId appId, IntentService intentService,
ExecutorService executorService) {
this.appId = appId;
this.intentService = intentService;
intents = new ConcurrentHashMap<>();
intentsSynchronizerExecutor = executorService;
}
/**
* Starts the synchronizer.
*/
public void start() {
}
/**
* Stops the synchronizer.
*/
public void stop() {
synchronized (this) {
// Stop the thread(s)
intentsSynchronizerExecutor.shutdownNow();
log.info("Intents Synchronizer Executor shutdown completed");
}
}
/**
* Withdraws all intents.
*/
public void removeIntents() {
if (!isElectedLeader) {
// only leader will withdraw intents
return;
}
log.debug("Intent Synchronizer shutdown: withdrawing all intents...");
for (Entry<Key, Intent> entry : intents.entrySet()) {
intentService.withdraw(entry.getValue());
log.debug("Intent Synchronizer withdrawing intent: {}",
entry.getValue());
}
intents.clear();
log.info("Tried to clean all intents");
}
@Override
public void submit(Intent intent) {
synchronized (this) {
intents.put(intent.key(), intent);
if (isElectedLeader && isActivatedLeader) {
log.trace("Submitting intent: {}", intent);
intentService.submit(intent);
}
}
}
@Override
public void withdraw(Intent intent) {
synchronized (this) {
intents.remove(intent.key(), intent);
if (isElectedLeader && isActivatedLeader) {
log.trace("Withdrawing intent: {}", intent);
intentService.withdraw(intent);
}
}
}
/**
* Signals the synchronizer that the leadership has changed.
*
* @param isLeader true if this instance is now the leader, otherwise false
*/
public void leaderChanged(boolean isLeader) {
log.debug("Leader changed: {}", isLeader);
if (!isLeader) {
this.isElectedLeader = false;
this.isActivatedLeader = false;
return; // Nothing to do
}
this.isActivatedLeader = false;
this.isElectedLeader = true;
// Run the synchronization method off-thread
intentsSynchronizerExecutor.execute(this::synchronizeIntents);
}
private void synchronizeIntents() {
Map<Key, Intent> serviceIntents = new HashMap<>();
intentService.getIntents().forEach(i -> {
if (i.appId().equals(appId)) {
serviceIntents.put(i.key(), i);
}
});
List<Intent> intentsToAdd = new LinkedList<>();
List<Intent> intentsToRemove = new LinkedList<>();
for (Intent localIntent : intents.values()) {
Intent serviceIntent = serviceIntents.remove(localIntent.key());
if (serviceIntent == null) {
intentsToAdd.add(localIntent);
} else {
IntentState state = intentService.getIntentState(serviceIntent.key());
if (!IntentUtils.equals(serviceIntent, localIntent) || state == null ||
state == IntentState.WITHDRAW_REQ ||
state == IntentState.WITHDRAWING ||
state == IntentState.WITHDRAWN) {
intentsToAdd.add(localIntent);
}
}
}
for (Intent serviceIntent : serviceIntents.values()) {
IntentState state = intentService.getIntentState(serviceIntent.key());
if (state != null && state != IntentState.WITHDRAW_REQ
&& state != IntentState.WITHDRAWING
&& state != IntentState.WITHDRAWN) {
intentsToRemove.add(serviceIntent);
}
}
log.debug("Intent Synchronizer: submitting {}, withdrawing {}",
intentsToAdd.size(), intentsToRemove.size());
// Withdraw Intents
for (Intent intent : intentsToRemove) {
intentService.withdraw(intent);
log.trace("Intent Synchronizer: withdrawing intent: {}",
intent);
}
if (!isElectedLeader) {
log.debug("Intent Synchronizer: cannot withdraw intents: " +
"not elected leader anymore");
isActivatedLeader = false;
return;
}
// Add Intents
for (Intent intent : intentsToAdd) {
intentService.submit(intent);
log.trace("Intent Synchronizer: submitting intent: {}",
intent);
}
if (!isElectedLeader) {
log.debug("Intent Synchronizer: cannot submit intents: " +
"not elected leader anymore");
isActivatedLeader = false;
return;
}
if (isElectedLeader) {
isActivatedLeader = true; // Allow push of Intents
} else {
isActivatedLeader = false;
}
log.debug("Intent synchronization completed");
}
}
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