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From aledsage <...@git.apache.org>
Subject [GitHub] incubator-brooklyn pull request: Deploy across an entire web clust...
Date Tue, 29 Jul 2014 12:00:46 GMT
Github user aledsage commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/83#discussion_r15518728
  
    --- Diff: software/webapp/src/main/java/brooklyn/entity/webapp/DynamicWebAppClusterImpl.java
---
    @@ -127,4 +158,140 @@ protected boolean calculateServiceUp() {
             }
             return up;
         }
    +    
    +    // TODO this will probably be useful elsewhere ... but where to put it?
    +    /** 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 <T> Task<T> whenServiceUp(final Entity target, final TaskAdaptable<T>
task, String name) {
    +        return Tasks.<T>builder().name(name).dynamic(true).body(new Callable<T>()
{
    +            @Override
    +            public T call() {
    +                try {
    +                    while (true) {
    +                        if (!Entities.isManaged(target)) {
    +                            Tasks.markInessential();
    +                            throw new IllegalStateException("Target "+target+" is no
longer managed");
    +                        }
    +                        if (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
    +    @Effector(description="Deploys the given artifact, from a source URL, to a given
deployment filename/context")
    +    public void deploy(
    +            @EffectorParam(name="url", description="URL of WAR file") String url, 
    +            @EffectorParam(name="targetName", description="context path where WAR should
be deployed (/ for ROOT)") String targetName) {
    +        checkNotNull(url, "url");
    +        checkNotNull(targetName, "targetName");
    +        targetName = filenameToWebContextMapper.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<CanDeployAndUndeploy> targets = Iterables.filter(getChildren(),
CanDeployAndUndeploy.class);
    +        TaskBuilder<Void> tb = Tasks.<Void>builder().parallel(true).name("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
    +        Set<String> deployedWars = MutableSet.copyOf(getAttribute(DEPLOYED_WARS));
    --- End diff --
    
    There is a race here for setting the attribute. But I'm not too concerned about that.
I wrote in some downstream project (can't remember which off hand!) some code to get+set the
attribute of type List atomically. Might be worth having some utility for that - but can think
about it in a different PR.


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