Example usage for com.google.common.base Functions constant

Introduction

In this page you can find the example usage for com.google.common.base Functions constant.

Prototype

public static <E> Function<Object, E> constant(@Nullable E value) 

Source Link

Document

Creates a function that returns value for any input.

Usage

From source file:brooklyn.entity.cloudfoundry.webapp.CloudFoundryWebAppImpl.java

/**
 * For connecting the {@link #INSTANCES_NUM} sensor.
 * <p>//from ww w .  jav  a2s.c o  m
 * Should be called inside {@link #connectSensors()}.
 *
 * @see #disconnectInstancesNumberSensor()
 */
protected void connectInstancesNumberSensor() {
    usedNumberOfInstances = FunctionFeed.builder().entity(this).period(Duration.seconds(2))
            .poll(new FunctionPollConfig<Integer, Integer>(INSTANCES_NUM).onException(Functions.constant(0))
                    .callable(new Callable<Integer>() {
                        public Integer call() {
                            return getDriver().getInstancesNumber();
                        }
                    }))
            .build();
}

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From source file:brooklyn.entity.software.http.HttpRequestSensor.java

@Override
public void apply(final EntityLocal entity) {
    super.apply(entity);

    if (LOG.isDebugEnabled()) {
        LOG.debug("Adding HTTP JSON sensor {} to {}", name, entity);
    }/*  w  w  w.  j  a  v  a 2  s  .  c om*/

    HttpPollConfig<T> pollConfig = new HttpPollConfig<T>(sensor)
            .checkSuccess(HttpValueFunctions.responseCodeEquals(200))
            .onFailureOrException(Functions.constant((T) null))
            .onSuccess(HttpValueFunctions.<T>jsonContentsFromPath(jsonPath)).period(period);

    HttpFeed.builder().entity(entity).baseUri(uri).credentialsIfNotNull(username, password).poll(pollConfig)
            .build();
}

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From source file:brooklyn.entity.webapp.jboss.JBoss7ServerImpl.java

@Override
protected void connectSensors() {
    super.connectSensors();

    HostAndPort hp = BrooklynAccessUtils.getBrooklynAccessibleAddress(this,
            getAttribute(MANAGEMENT_HTTP_PORT) + getConfig(PORT_INCREMENT));

    String managementUri = String.format("http://%s:%s/management/subsystem/web/connector/http/read-resource",
            hp.getHostText(), hp.getPort());
    setAttribute(MANAGEMENT_URL, managementUri);
    log.debug("JBoss sensors for " + this + " reading from " + managementUri);
    Map<String, String> includeRuntimeUriVars = ImmutableMap.of("include-runtime", "true");

    httpFeed = HttpFeed.builder().entity(this).period(200).baseUri(managementUri)
            .credentials(getConfig(MANAGEMENT_USER), getConfig(MANAGEMENT_PASSWORD))
            .poll(new HttpPollConfig<Integer>(MANAGEMENT_STATUS).onSuccess(HttpValueFunctions.responseCode()))
            .poll(new HttpPollConfig<Boolean>(MANAGEMENT_URL_UP)
                    .onSuccess(HttpValueFunctions.responseCodeEquals(200))
                    .onFailureOrException(Functions.constant(false)))
            .poll(new HttpPollConfig<Integer>(REQUEST_COUNT).vars(includeRuntimeUriVars)
                    .onSuccess(HttpValueFunctions.jsonContents("requestCount", Integer.class)))
            .poll(new HttpPollConfig<Integer>(ERROR_COUNT).vars(includeRuntimeUriVars)
                    .onSuccess(HttpValueFunctions.jsonContents("errorCount", Integer.class)))
            .poll(new HttpPollConfig<Integer>(TOTAL_PROCESSING_TIME).vars(includeRuntimeUriVars)
                    .onSuccess(HttpValueFunctions.jsonContents("processingTime", Integer.class)))
            .poll(new HttpPollConfig<Integer>(MAX_PROCESSING_TIME).vars(includeRuntimeUriVars)
                    .onSuccess(HttpValueFunctions.jsonContents("maxTime", Integer.class)))
            .poll(new HttpPollConfig<Long>(BYTES_RECEIVED).vars(includeRuntimeUriVars)
                    // jboss seems to report 0 even if it has received lots of requests; dunno why.
                    .onSuccess(HttpValueFunctions.jsonContents("bytesReceived", Long.class)))
            .poll(new HttpPollConfig<Long>(BYTES_SENT).vars(includeRuntimeUriVars)
                    .onSuccess(HttpValueFunctions.jsonContents("bytesSent", Long.class)))
            .build();//  ww w . j a va2 s .  c  o  m

    connectServiceUp();
}

---

From source file:com.appenginefan.toolkit.common.PersistentQueue.java

/**
 * Helper: fetches the head of the queue
 * //from   w w w  . j a  va  2  s .c om
 * @param delete
 *          if set to true, delete the head from the store
 * @return the head object or null if it was empty
 */
private T fetch(boolean delete) {
    List<Entry<String, T>> firstElement = Utilities.scanByPrefix(store, prefix, 1);
    if (firstElement.isEmpty()) {
        return null;
    }
    if (delete) {
        store.mutate(firstElement.get(0).getKey(), Functions.constant((T) null));
    }
    return firstElement.get(0).getValue();
}

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From source file:zotmc.collect.Conversions.java

public static <E> Function<?, E> constant(E value) {
    return Functions.constant(value);
}

---

From source file:com.android.tools.idea.npw.importing.ImportUIUtil.java

/**
 * Returns a relative path string to be shown in the UI. Wizard logic
 * operates with VirtualFile's so these paths are only for user. The paths
 * shown are relative to the file system location user specified, showing
 * relative paths will be easier for the user to read.
 *///from w w  w  .j  av  a2  s.  co m
static String getRelativePath(@Nullable VirtualFile baseFile, @Nullable VirtualFile file) {
    if (file == null) {
        return "";
    }
    String path = file.getPath();
    if (baseFile == null) {
        return path;
    } else if (file.equals(baseFile)) {
        return ".";
    } else if (!baseFile.isDirectory()) {
        return getRelativePath(baseFile.getParent(), file);
    } else {
        String basePath = baseFile.getPath();
        if (path.startsWith(basePath + "/")) {
            return path.substring(basePath.length() + 1);
        } else if (file.getFileSystem().equals(baseFile.getFileSystem())) {
            StringBuilder builder = new StringBuilder(basePath.length());
            String prefix = Strings.commonPrefix(path, basePath);
            if (!prefix.endsWith("/")) {
                prefix = prefix.substring(0, prefix.lastIndexOf("/") + 1);
            }
            if (!path.startsWith(basePath)) {
                Iterable<String> segments = Splitter.on("/").split(basePath.substring(prefix.length()));
                Joiner.on("/").appendTo(builder, Iterables.transform(segments, Functions.constant("..")));
                builder.append("/");
            }
            builder.append(path.substring(prefix.length()));
            return builder.toString();
        } else {
            return path;
        }
    }
}

---

From source file:brooklyn.qa.load.SimulatedNginxControllerImpl.java

@Override
public void connectSensors() {
    boolean simulateEntity = getConfig(SIMULATE_ENTITY);
    boolean simulateExternalMonitoring = getConfig(SIMULATE_EXTERNAL_MONITORING);

    if (!simulateEntity && !simulateExternalMonitoring) {
        super.connectSensors();
        return;//  www . ja v a2s .  c  o m
    }

    // From AbstractController.connectSensors
    if (getUrl() == null) {
        setAttribute(MAIN_URI, URI.create(inferUrl()));
        setAttribute(ROOT_URL, inferUrl());
    }
    addServerPoolMemberTrackingPolicy();

    // From NginxController.connectSensors
    ConfigToAttributes.apply(this);

    if (!simulateExternalMonitoring) {
        // if simulating entity, then simulate work of periodic HTTP request; TODO but not parsing JSON response
        String uriToPoll = (simulateEntity) ? "http://localhost:8081" : getAttribute(MAIN_URI).toString();

        httpFeed = HttpFeed.builder().entity(this).period(getConfig(HTTP_POLL_PERIOD)).baseUri(uriToPoll)
                .poll(new HttpPollConfig<Boolean>(SERVICE_UP).onSuccess(Functions.constant(true))
                        .onFailureOrException(Functions.constant(true)))
                .build();
    }

    functionFeed = FunctionFeed.builder().entity(this).period(getConfig(HTTP_POLL_PERIOD))
            .poll(new FunctionPollConfig<Boolean, Boolean>(SERVICE_UP).callable(new Callable<Boolean>() {
                public Boolean call() {
                    return true;
                }
            })).build();

    // Can guarantee that parent/managementContext has been set
    Group urlMappings = getConfig(URL_MAPPINGS);
    if (urlMappings != null) {
        // Listen to the targets of each url-mapping changing
        subscribeToMembers(urlMappings, UrlMapping.TARGET_ADDRESSES,
                new SensorEventListener<Collection<String>>() {
                    @Override
                    public void onEvent(SensorEvent<Collection<String>> event) {
                        updateNeeded();
                    }
                });

        // Listen to url-mappings being added and removed
        urlMappingsMemberTrackerPolicy = addPolicy(
                PolicySpec.create(UrlMappingsMemberTrackerPolicy.class).configure("group", urlMappings));
    }
}

---

From source file:brooklyn.entity.messaging.activemq.ActiveMQBrokerImpl.java

@Override
protected void connectSensors() {
    setAttribute(BROKER_URL,/* w w w . ja  v a 2s .  com*/
            String.format("tcp://%s:%d", getAttribute(HOSTNAME), getAttribute(OPEN_WIRE_PORT)));

    String brokerMbeanName = "org.apache.activemq:type=Broker,brokerName=" + getBrokerName();

    jmxFeed = JmxFeed.builder().entity(this).period(500, TimeUnit.MILLISECONDS)
            .pollAttribute(new JmxAttributePollConfig<Boolean>(SERVICE_UP).objectName(brokerMbeanName)
                    .attributeName("BrokerName").onSuccess(Functions.forPredicate(Predicates.notNull()))
                    .onFailureOrException(Functions.constant(false)))
            .build();
}

---

From source file:org.apache.brooklyn.entity.messaging.activemq.ActiveMQBrokerImpl.java

@Override
protected void connectSensors() {
    sensors().set(BROKER_URL,//ww  w . java 2  s . co m
            String.format("tcp://%s:%d", getAttribute(HOSTNAME), getAttribute(OPEN_WIRE_PORT)));

    String brokerMbeanName = "org.apache.activemq:type=Broker,brokerName=" + getBrokerName();

    jmxFeed = JmxFeed.builder().entity(this).period(500, TimeUnit.MILLISECONDS)
            .pollAttribute(new JmxAttributePollConfig<Boolean>(SERVICE_UP).objectName(brokerMbeanName)
                    .attributeName("BrokerName").onSuccess(Functions.forPredicate(Predicates.notNull()))
                    .onFailureOrException(Functions.constant(false)).suppressDuplicates(true))
            .build();
}

---

From source file:org.apache.brooklyn.entity.messaging.kafka.KafkaBrokerImpl.java

@Override
protected void connectSensors() {
    connectServiceUpIsRunning();/*from w  w  w  . jav  a 2 s. c om*/
    boolean retrieveUsageMetrics = getConfig(RETRIEVE_USAGE_METRICS);

    if (((KafkaBrokerDriver) getDriver()).isJmxEnabled()) {
        jmxFeed = JmxFeed.builder().entity(this).period(500, TimeUnit.MILLISECONDS)
                .pollAttribute(new JmxAttributePollConfig<Long>(FETCH_REQUEST_COUNT)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("NumFetchRequests")
                        .onException(Functions.constant(-1l)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Long>(TOTAL_FETCH_TIME)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("TotalFetchRequestMs")
                        .onException(Functions.constant(-1l)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Double>(MAX_FETCH_TIME)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("MaxFetchRequestMs")
                        .onException(Functions.constant(-1.0d)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Long>(PRODUCE_REQUEST_COUNT)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("NumProduceRequests")
                        .onException(Functions.constant(-1l)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Long>(TOTAL_PRODUCE_TIME)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("TotalProduceRequestMs")
                        .onException(Functions.constant(-1l)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Double>(MAX_PRODUCE_TIME)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("MaxProduceRequestMs")
                        .onException(Functions.constant(-1.0d)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Long>(BYTES_RECEIVED)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("TotalBytesRead")
                        .onException(Functions.constant(-1l)).enabled(retrieveUsageMetrics))
                .pollAttribute(new JmxAttributePollConfig<Long>(BYTES_SENT)
                        .objectName(SOCKET_SERVER_STATS_MBEAN).attributeName("TotalBytesWritten")
                        .onException(Functions.constant(-1l)).enabled(retrieveUsageMetrics))
                .build();
    }

    setBrokerUrl();
}

---

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