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Brooklyn entities for Web App software processes
/*
* 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 org.apache.brooklyn.entity.webapp;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import org.apache.brooklyn.api.entity.Entity;
import org.apache.brooklyn.api.mgmt.Task;
import org.apache.brooklyn.api.mgmt.TaskAdaptable;
import org.apache.brooklyn.api.sensor.AttributeSensor;
import org.apache.brooklyn.core.effector.Effectors;
import org.apache.brooklyn.core.entity.Attributes;
import org.apache.brooklyn.core.entity.Entities;
import org.apache.brooklyn.core.entity.EntityInternal;
import org.apache.brooklyn.enricher.stock.Enrichers;
import org.apache.brooklyn.entity.group.DynamicCluster;
import org.apache.brooklyn.entity.group.DynamicClusterImpl;
import org.apache.brooklyn.util.collections.MutableMap;
import org.apache.brooklyn.util.collections.MutableSet;
import org.apache.brooklyn.util.core.task.DynamicTasks;
import org.apache.brooklyn.util.core.task.TaskBuilder;
import org.apache.brooklyn.util.core.task.TaskTags;
import org.apache.brooklyn.util.core.task.Tasks;
import org.apache.brooklyn.util.exceptions.Exceptions;
import org.apache.brooklyn.util.time.Duration;
import org.apache.brooklyn.util.time.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
/**
* DynamicWebAppClusters provide cluster-wide aggregates of entity attributes. Currently totals and averages:
*
* - Entity request counts
* - Entity error counts
* - Requests per second
* - Entity processing time
*
*/
public class DynamicWebAppClusterImpl extends DynamicClusterImpl implements DynamicWebAppCluster {
private static final Logger log = LoggerFactory.getLogger(DynamicWebAppClusterImpl.class);
private static final FilenameToWebContextMapper FILENAME_TO_WEB_CONTEXT_MAPPER = new FilenameToWebContextMapper();
/**
* Instantiate a new DynamicWebAppCluster. Parameters as per {@link DynamicCluster#DynamicCluster()}
*/
public DynamicWebAppClusterImpl() {
super();
}
@Override
public void init() {
super.init();
// Enricher attribute setup. A way of automatically discovering these (but avoiding
// averaging things like HTTP port and response codes) would be neat.
List>> summingEnricherSetup = ImmutableList.of(
ImmutableList.of(REQUEST_COUNT, REQUEST_COUNT),
ImmutableList.of(ERROR_COUNT, ERROR_COUNT),
ImmutableList.of(REQUESTS_PER_SECOND_LAST, REQUESTS_PER_SECOND_LAST),
ImmutableList.of(REQUESTS_PER_SECOND_IN_WINDOW, REQUESTS_PER_SECOND_IN_WINDOW),
ImmutableList.of(TOTAL_PROCESSING_TIME, TOTAL_PROCESSING_TIME),
ImmutableList.of(PROCESSING_TIME_FRACTION_IN_WINDOW, PROCESSING_TIME_FRACTION_IN_WINDOW)
);
List>> averagingEnricherSetup = ImmutableList.of(
ImmutableList.of(REQUEST_COUNT, REQUEST_COUNT_PER_NODE),
ImmutableList.of(ERROR_COUNT, ERROR_COUNT_PER_NODE),
ImmutableList.of(REQUESTS_PER_SECOND_LAST, REQUESTS_PER_SECOND_LAST_PER_NODE),
ImmutableList.of(REQUESTS_PER_SECOND_IN_WINDOW, REQUESTS_PER_SECOND_IN_WINDOW_PER_NODE),
ImmutableList.of(TOTAL_PROCESSING_TIME, TOTAL_PROCESSING_TIME_PER_NODE),
ImmutableList.of(PROCESSING_TIME_FRACTION_IN_WINDOW, PROCESSING_TIME_FRACTION_IN_WINDOW_PER_NODE)
);
for (List> es : summingEnricherSetup) {
AttributeSensor t = es.get(0);
AttributeSensor total = es.get(1);
enrichers().add(Enrichers.builder()
.aggregating(t)
.publishing(total)
.fromMembers()
.computingSum()
.build());
}
for (List> es : averagingEnricherSetup) {
@SuppressWarnings("unchecked")
AttributeSensor t = (AttributeSensor) es.get(0);
@SuppressWarnings("unchecked")
AttributeSensor average = (AttributeSensor) es.get(1);
enrichers().add(Enrichers.builder()
.aggregating(t)
.publishing(average)
.fromMembers()
.computingAverage()
.defaultValueForUnreportedSensors(0)
.build());
}
}
// TODO this will probably be useful elsewhere ... but where to put it?
// TODO add support for this in DependentConfiguration (see TODO there)
/** Waits for the given target to report service up, then runs the given task
* (often an invocation on that entity), with the given name.
* If the target goes away, this task marks itself inessential
* before failing so as not to cause a parent task to fail. */
static Task whenServiceUp(final Entity target, final TaskAdaptable task, String name) {
return Tasks.builder().displayName(name).dynamic(true).body(new Callable() {
@Override
public T call() {
try {
while (true) {
if (!Entities.isManaged(target)) {
Tasks.markInessential();
throw new IllegalStateException("Target "+target+" is no longer managed");
}
if (Boolean.TRUE.equals(target.getAttribute(Attributes.SERVICE_UP))) {
Tasks.resetBlockingDetails();
TaskTags.markInessential(task);
DynamicTasks.queue(task);
try {
return task.asTask().getUnchecked();
} catch (Exception e) {
if (Entities.isManaged(target)) {
throw Exceptions.propagate(e);
} else {
Tasks.markInessential();
throw new IllegalStateException("Target "+target+" is no longer managed", e);
}
}
} else {
Tasks.setBlockingDetails("Waiting on "+target+" to be ready");
}
// TODO replace with subscription?
Time.sleep(Duration.ONE_SECOND);
}
} finally {
Tasks.resetBlockingDetails();
}
}
}).build();
}
@Override
public void deploy(String url, String targetName) {
checkNotNull(url, "url");
checkNotNull(targetName, "targetName");
targetName = FILENAME_TO_WEB_CONTEXT_MAPPER.convertDeploymentTargetNameToContext(targetName);
// set it up so future nodes get the right wars
addToWarsByContext(this, url, targetName);
log.debug("Deploying "+targetName+"->"+url+" across cluster "+this+"; WARs now "+getConfig(WARS_BY_CONTEXT));
Iterable targets = Iterables.filter(getChildren(), CanDeployAndUndeploy.class);
TaskBuilder tb = Tasks.builder().parallel(true).displayName("Deploy "+targetName+" to cluster (size "+Iterables.size(targets)+")");
for (Entity target: targets) {
tb.add(whenServiceUp(target, Effectors.invocation(target, DEPLOY, MutableMap.of("url", url, "targetName", targetName)),
"Deploy "+targetName+" to "+target+" when ready"));
}
DynamicTasks.queueIfPossible(tb.build()).orSubmitAsync(this).asTask().getUnchecked();
// Update attribute
// TODO support for atomic sensor update (should be part of standard tooling; NB there is some work towards this, according to @aledsage)
Set deployedWars = MutableSet.copyOf(getAttribute(DEPLOYED_WARS));
deployedWars.add(targetName);
sensors().set(DEPLOYED_WARS, deployedWars);
}
@Override
public void undeploy(String targetName) {
checkNotNull(targetName, "targetName");
targetName = FILENAME_TO_WEB_CONTEXT_MAPPER.convertDeploymentTargetNameToContext(targetName);
// set it up so future nodes get the right wars
if (!removeFromWarsByContext(this, targetName)) {
DynamicTasks.submit(Tasks.warning("Context "+targetName+" not known at "+this+"; attempting to undeploy regardless", null), this);
}
log.debug("Undeploying "+targetName+" across cluster "+this+"; WARs now "+getConfig(WARS_BY_CONTEXT));
Iterable targets = Iterables.filter(getChildren(), CanDeployAndUndeploy.class);
TaskBuilder tb = Tasks.builder().parallel(true).displayName("Undeploy "+targetName+" across cluster (size "+Iterables.size(targets)+")");
for (Entity target: targets) {
tb.add(whenServiceUp(target, Effectors.invocation(target, UNDEPLOY, MutableMap.of("targetName", targetName)),
"Undeploy "+targetName+" at "+target+" when ready"));
}
DynamicTasks.queueIfPossible(tb.build()).orSubmitAsync(this).asTask().getUnchecked();
// Update attribute
Set deployedWars = MutableSet.copyOf(getAttribute(DEPLOYED_WARS));
deployedWars.remove( FILENAME_TO_WEB_CONTEXT_MAPPER.convertDeploymentTargetNameToContext(targetName) );
sensors().set(DEPLOYED_WARS, deployedWars);
}
static void addToWarsByContext(Entity entity, String url, String targetName) {
targetName = FILENAME_TO_WEB_CONTEXT_MAPPER.convertDeploymentTargetNameToContext(targetName);
// TODO a better way to do atomic updates, see comment above
synchronized (entity) {
Map newWarsMap = MutableMap.copyOf(entity.getConfig(WARS_BY_CONTEXT));
newWarsMap.put(targetName, url);
entity.config().set(WARS_BY_CONTEXT, newWarsMap);
}
}
static boolean removeFromWarsByContext(Entity entity, String targetName) {
targetName = FILENAME_TO_WEB_CONTEXT_MAPPER.convertDeploymentTargetNameToContext(targetName);
// TODO a better way to do atomic updates, see comment above
synchronized (entity) {
Map newWarsMap = MutableMap.copyOf(entity.getConfig(WARS_BY_CONTEXT));
String url = newWarsMap.remove(targetName);
if (url==null) {
return false;
}
entity.config().set(WARS_BY_CONTEXT, newWarsMap);
return true;
}
}
@Override
public void redeployAll() {
Map wars = MutableMap.copyOf(getConfig(WARS_BY_CONTEXT));
String redeployPrefix = "Redeploy all WARs (count "+wars.size()+")";
log.debug("Redeplying all WARs across cluster "+this+": "+getConfig(WARS_BY_CONTEXT));
Iterable targetEntities = Iterables.filter(getChildren(), CanDeployAndUndeploy.class);
TaskBuilder tb = Tasks.builder().parallel(true).displayName(redeployPrefix+" across cluster (size "+Iterables.size(targetEntities)+")");
for (Entity targetEntity: targetEntities) {
TaskBuilder redeployAllToTarget = Tasks.builder().displayName(redeployPrefix+" at "+targetEntity+" (after ready check)");
for (String warContextPath: wars.keySet()) {
redeployAllToTarget.add(Effectors.invocation(targetEntity, DEPLOY, MutableMap.of("url", wars.get(warContextPath), "targetName", warContextPath)));
}
tb.add(whenServiceUp(targetEntity, redeployAllToTarget.build(), redeployPrefix+" at "+targetEntity+" when ready"));
}
DynamicTasks.queueIfPossible(tb.build()).orSubmitAsync(this).asTask().getUnchecked();
}
}