FooComponent.java
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/*
* Copyright 2014 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.foo;
import static java.util.concurrent.Executors.newScheduledThreadPool;
import static org.onlab.util.Tools.namedThreads;
import static org.slf4j.LoggerFactory.getLogger;
import java.nio.ByteBuffer;
import java.util.concurrent.ScheduledExecutorService;
//import java.util.concurrent.TimeUnit;
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.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.onosproject.cluster.ClusterEvent;
import org.onosproject.cluster.ClusterEventListener;
import org.onosproject.cluster.ClusterService;
import org.onosproject.cluster.NodeId;
import org.onosproject.mastership.MastershipEvent;
import org.onosproject.mastership.MastershipListener;
import org.onosproject.mastership.MastershipService;
import org.onosproject.net.device.DeviceEvent;
import org.onosproject.net.device.DeviceListener;
import org.onosproject.net.device.DeviceService;
import org.onosproject.net.intent.IntentEvent;
import org.onosproject.net.intent.IntentListener;
import org.onosproject.net.intent.IntentService;
import org.onosproject.store.service.DatabaseAdminService;
import org.onosproject.store.service.DatabaseException;
import org.onosproject.store.service.DatabaseService;
import org.onosproject.store.service.Lock;
import org.onosproject.store.service.LockService;
import org.onosproject.store.service.VersionedValue;
import org.slf4j.Logger;
/**
* Playground app component.
*/
@Component(immediate = true)
public class FooComponent {
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected ClusterService clusterService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected DeviceService deviceService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected IntentService intentService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected MastershipService mastershipService;
@Reference(cardinality = ReferenceCardinality.OPTIONAL_UNARY)
protected DatabaseAdminService dbAdminService;
@Reference(cardinality = ReferenceCardinality.OPTIONAL_UNARY)
protected DatabaseService dbService;
@Reference(cardinality = ReferenceCardinality.OPTIONAL_UNARY)
protected LockService lockService;
private final ClusterEventListener clusterListener = new InnerClusterListener();
private final DeviceListener deviceListener = new InnerDeviceListener();
private final IntentListener intentListener = new InnerIntentListener();
private final MastershipListener mastershipListener = new InnerMastershipListener();
private ScheduledExecutorService executor;
@Activate
public void activate() {
executor = newScheduledThreadPool(4, namedThreads("foo-executor-%d"));
clusterService.addListener(clusterListener);
deviceService.addListener(deviceListener);
intentService.addListener(intentListener);
mastershipService.addListener(mastershipListener);
if (dbService == null || dbAdminService == null) {
log.info("Couldn't find DB service");
} else {
log.info("Found DB service");
//longIncrementor();
//lockUnlock();
//executor.scheduleAtFixedRate(new LongIncrementor(), 1, 10, TimeUnit.SECONDS);
//executor.scheduleAtFixedRate(new LongIncrementor(), 1, 10, TimeUnit.SECONDS);
}
log.info("Started");
}
@Deactivate
public void deactivate() {
executor.shutdown();
clusterService.removeListener(clusterListener);
deviceService.removeListener(deviceListener);
intentService.removeListener(intentListener);
mastershipService.removeListener(mastershipListener);
log.info("Stopped");
}
private class InnerClusterListener implements ClusterEventListener {
@Override
public void event(ClusterEvent event) {
log.info("WOOOOT! {}", event);
}
}
private class InnerDeviceListener implements DeviceListener {
@Override
public void event(DeviceEvent event) {
log.info("YEEEEHAAAAW! {}", event);
}
}
private class InnerIntentListener implements IntentListener {
@Override
public void event(IntentEvent event) {
String message;
if (event.type() == IntentEvent.Type.INSTALL_REQ) {
message = "WOW! It looks like someone has some intentions: {}";
} else if (event.type() == IntentEvent.Type.INSTALLED) {
message = "AWESOME! So far things are going great: {}";
} else if (event.type() == IntentEvent.Type.WITHDRAWN) {
message = "HMMM! Ambitions are fading apparently: {}";
} else {
message = "CRAP!!! Things are not turning out as intended: {}";
}
log.info(message, event.subject());
}
}
private class InnerMastershipListener implements MastershipListener {
@Override
public void event(MastershipEvent event) {
final NodeId myId = clusterService.getLocalNode().id();
if (myId.equals(event.roleInfo().master())) {
log.info("I have control/I wish you luck {}", event);
} else {
log.info("you have control {}", event);
}
}
}
private void lockUnlock() throws InterruptedException {
try {
final String locksTable = "onos-locks";
if (!dbAdminService.listTables().contains(locksTable)) {
dbAdminService.createTable(locksTable, 10000);
}
Lock lock = lockService.create("foo-bar");
log.info("Requesting lock");
lock.lock(10000);
//try {
//Thread.sleep(5000);
//} catch (InterruptedException e) {
//e.printStackTrace();
//}
log.info("Acquired Lock");
log.info("Do I have the lock: {} ", lock.isLocked());
//lock.unlock();
log.info("Do I have the lock: {} ", lock.isLocked());
} finally {
log.info("Done");
}
}
private void longIncrementor() {
try {
final String someTable = "admin";
final String someKey = "long";
if (!dbAdminService.listTables().contains(someTable)) {
dbAdminService.createTable(someTable);
}
VersionedValue vv = dbService.get(someTable, someKey);
if (vv == null) {
ByteBuffer zero = ByteBuffer.allocate(Long.BYTES).putLong(0);
if (dbService.putIfAbsent(someTable, someKey, zero.array())) {
log.info("Wrote initial value");
vv = dbService.get(someTable, someKey);
} else {
log.info("Concurrent write detected.");
// concurrent write detected, read and fall through
vv = dbService.get(someTable, someKey);
if (vv == null) {
log.error("Shouldn't reach here");
}
}
}
int retry = 1;
do {
if (vv == null) {
log.error("Shouldn't reach here - value is null");
break;
}
ByteBuffer prev = ByteBuffer.wrap(vv.value());
long next = prev.getLong() + 1;
byte[] newValue = ByteBuffer.allocate(Long.BYTES).putLong(next).array();
if (dbService.putIfVersionMatches(someTable, someKey, newValue, vv.version())) {
log.info("Write success. New value: {}", next);
break;
} else {
log.info("Write failed retrying.....{}", retry);
vv = dbService.get(someTable, someKey);
if (vv == null) {
log.error("Shouldn't reach here");
}
}
} while (retry++ < 5);
} catch (DatabaseException e) {
log.debug("DB Exception thrown {}", e.getMessage());
} catch (Exception e) {
log.error("Exception thrown", e);
}
}
private final class LongIncrementor implements Runnable {
@Override
public void run() {
longIncrementor();
}
}
}