Examples with SharedCountListener org.apache.curator.framework.recipes.shared.SharedCountListener used on opensource projects

Example 1 with SharedCountListener

use of org.apache.curator.framework.recipes.shared.SharedCountListener in project fabric8 by jboss-fuse.

the class DummyBatchingProgressMonitor method activateInternal.

private void activateInternal() throws Exception {
    LOGGER.info("Starting up GitDataStore " + this);
    // Call the bootstrap {@link DataStoreTemplate}
    DataStoreTemplate template = runtimeProperties.get().removeRuntimeAttribute(DataStoreTemplate.class);
    if (template != null) {
        // Do the initial commit and set the root tag
        Ref rootTag = getGit().getRepository().getRef(GitHelpers.ROOT_TAG);
        if (rootTag == null) {
            getGit().commit().setMessage("First Commit").setCommitter("fabric", "user@fabric").call();
            getGit().tag().setName(GitHelpers.ROOT_TAG).setMessage("Tag the root commit").call();
        }
        LOGGER.debug("Running datastore bootstrap template: " + template);
        template.doWith(this, dataStore.get());
    }
    // Setup proxy service
    GitProxyService proxyService = gitProxyService.get();
    defaultProxySelector = ProxySelector.getDefault();
    // authenticator disabled, until properly tested it does not affect others, as Authenticator is static in the JVM
    // Authenticator.setDefault(new FabricGitLocalHostAuthenticator(proxyService));
    ProxySelector fabricProxySelector = new FabricGitLocalHostProxySelector(defaultProxySelector, proxyService);
    ProxySelector.setDefault(fabricProxySelector);
    LOGGER.debug("Setting up FabricProxySelector: {}", fabricProxySelector);
    if (gitRemoteUrl != null) {
        gitListener.runRemoteUrlChanged(gitRemoteUrl);
        remoteUrl = gitRemoteUrl;
    } else {
        gitService.get().addGitListener(gitListener);
        remoteUrl = gitService.get().getRemoteUrl();
        if (remoteUrl != null) {
            gitListener.runRemoteUrlChanged(remoteUrl);
        }
    }
    // Get initial versions
    getInitialVersions();
    // poll logic in case of remote git repo
    if (gitRemoteUrl != null) {
        // i need this old logic in case of remote repos
        LOGGER.info("Starting to pull from remote git repository every {} millis", gitRemotePollInterval);
        threadPool.scheduleWithFixedDelay(new Runnable() {

            @Override
            public void run() {
                LockHandle writeLock = aquireWriteLock();
                try {
                    LOGGER.trace("Performing timed pull");
                    doPullInternal();
                    LOGGER.debug("Performed timed pull from external git repo");
                } catch (Throwable e) {
                    LOGGER.debug("Error during performed timed pull/push due " + e.getMessage(), e);
                    LOGGER.warn("Error during performed timed pull/push due " + e.getMessage() + ". This exception is ignored.");
                } finally {
                    writeLock.unlock();
                }
            }

            @Override
            public String toString() {
                return "TimedPushTask";
            }
        }, 1000, gitRemotePollInterval, TimeUnit.MILLISECONDS);
    }
    LOGGER.info("Using ZooKeeper SharedCount to react when master git repo is changed, so we can do a git pull to the local git repo.");
    counter = new SharedCount(curator.get(), ZkPath.GIT_TRIGGER.getPath(), 0);
    counter.addListener(new SharedCountListener() {

        @Override
        public void countHasChanged(final SharedCountReader sharedCountReader, final int value) throws Exception {
            Runnable task = new Runnable() {

                @Override
                public void run() {
                    doPullInternal();
                }
            };
            if (gitRandomFetchDelay == 0) {
                LOGGER.debug("Watch counter updated to " + value + ", scheduling immediate pull");
                threadPool.submit(task);
            } else {
                int delay = RND.nextInt(gitRandomFetchDelay) + 1;
                LOGGER.debug("Watch counter updated to " + value + ", scheduling pull with random delay=" + delay + "s");
                threadPool.schedule(task, delay, TimeUnit.SECONDS);
            }
        }

        @Override
        public void stateChanged(CuratorFramework curatorFramework, ConnectionState connectionState) {
            switch(connectionState) {
                case SUSPENDED:
                case READ_ONLY:
                case LOST:
                    // do nothing
                    break;
                case CONNECTED:
                case RECONNECTED:
                    LOGGER.info("Shared Counter (Re)connected, doing a pull");
                    doPullInternal();
                    break;
            }
        }
    });
    try {
        counter.start();
    } catch (KeeperException.NotReadOnlyException ex) {
    // In read only mode the counter is not going to start.
    // If the connection is reestablished the component will reactivate.
    // We need to catch this error so that the component gets activated.
    }
    if (gitGcOnLoad) {
        LockHandle writeLock = aquireWriteLock();
        try {
            GitOperation<Void> gitop = new GitOperation<Void>() {

                public Void call(Git git, GitContext context) throws Exception {
                    long before = System.currentTimeMillis();
                    try {
                        git.gc().call();
                        LOGGER.debug("git gc took " + ((System.currentTimeMillis() - before)) + " ms.");
                    } catch (GitAPIException e) {
                        LOGGER.debug("git gc threw an exception!", e);
                    }
                    return null;
                }
            };
            executeInternal(new GitContext(), null, gitop);
        } finally {
            writeLock.unlock();
        }
    }
    // failing to activate the component
    if (readWriteLock.isWriteLockedByCurrentThread() || readWriteLock.getWriteHoldCount() == 0) {
        try {
            // let's delegate to other thread in order to free MCF thread
            // ENTESB-7843: there's a problem when jetty is configured with TLS and keystore location using
            // profile: URI. while Jetty continues to be configured if profile:jetty.xml isn't available
            // (and it isn't initially), it fails trying to access keystore via profile: URI.
            // we should optimistically assume we can pull, but there's nothing wrong if we can't
            // - we'll be able to pull later
            threadPoolInitial.execute(new Runnable() {

                @Override
                public void run() {
                    doPullInternal(5);
                }
            });
        } catch (IllegalStateException e) {
            LOGGER.info("Another thread acquired write lock and GitDataStore can't pull from remote repository.");
        }
    } else {
        LOGGER.info("Another thread is keeping git write lock. GitDataStore will continue activation.");
    }
}