NIFI-1690 Changed MonitorMemory to use allowable values for pool names

- removed dead code from MonitorMemory
- added MonitorMemoryTest
- minor refactoring in MonitorMemory
- initial fix for NIFI-1731 (WARN/INFO logging) that was required by MonitorMemoryTest

NIFI-1690 polishing

NIFI-1690 address PR comments, removed default value for MEMORY_POOL_PROPERTY

NIFI-1690 addressed latest PR comments

NIFI-1690 fixed breaking changes

Fixed checkstyle issue in StandardProcessScheduler. (+2 squashed commits)
Squashed commits:
[03829c4] Fixed checkstyle issues.
[cb20fe6]

This closes #328.

Signed-off-by: Andy LoPresto <alopresto@apache.org>

nifi-mock/src/main/java/org/apache/nifi/util/CapturingLogger.java

@@ -6,6 +6,7 @@ import java.util.List;
 
 import org.slf4j.Logger;
 import org.slf4j.Marker;
+import org.slf4j.helpers.MessageFormatter;
 
 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
@@ -215,25 +216,23 @@ public class CapturingLogger implements Logger {
 
     @Override
     public void info(String msg) {
-        infoMessages.add(new LogMessage(null, msg, null));
+        this.info(msg, (Object) null);
-        logger.info(msg);
     }
 
     @Override
     public void info(String format, Object arg) {
-        infoMessages.add(new LogMessage(null, format, null, arg));
+        this.info(format, arg, null);
-        logger.info(format, arg);
     }
 
     @Override
     public void info(String format, Object arg1, Object arg2) {
-        infoMessages.add(new LogMessage(null, format, null, arg1, arg2));
+        this.info(format, new Object[] { arg1, arg2 });
-        logger.info(format, arg1, arg2);
     }
 
     @Override
     public void info(String format, Object... arguments) {
-        infoMessages.add(new LogMessage(null, format, null, arguments));
+        String message = MessageFormatter.arrayFormat(format, arguments).getMessage();
+        infoMessages.add(new LogMessage(null, message, null, arguments));
         logger.info(format, arguments);
     }
 
@@ -287,25 +286,23 @@ public class CapturingLogger implements Logger {
 
     @Override
     public void warn(String msg) {
-        warnMessages.add(new LogMessage(null, msg, null));
+        this.warn(msg, (Object) null);
-        logger.warn(msg);
     }
 
     @Override
     public void warn(String format, Object arg) {
-        warnMessages.add(new LogMessage(null, format, null, arg));
+        this.warn(format, arg, null);
-        logger.warn(format, arg);
     }
 
     @Override
     public void warn(String format, Object arg1, Object arg2) {
-        warnMessages.add(new LogMessage(null, format, null, arg1, arg2));
+        this.warn(format, new Object[] { arg1, arg2 });
-        logger.warn(format, arg1, arg2);
     }
 
     @Override
     public void warn(String format, Object... arguments) {
-        warnMessages.add(new LogMessage(null, format, null, arguments));
+        String message = MessageFormatter.arrayFormat(format, arguments).getMessage();
+        warnMessages.add(new LogMessage(null, message, null, arguments));
         logger.warn(format, arguments);
     }
 

nifi-mock/src/main/java/org/apache/nifi/util/LogMessage.java

@@ -42,4 +42,9 @@ public class LogMessage {
     public Object[] getArgs() {
         return args;
     }
+
+    @Override
+    public String toString() {
+        return this.msg;
+    }
 }

nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/scheduling/StandardProcessScheduler.java

@@ -43,7 +43,6 @@ import org.apache.nifi.controller.ReportingTaskNode;
 import org.apache.nifi.controller.ScheduledState;
 import org.apache.nifi.controller.SchedulingAgentCallback;
 import org.apache.nifi.controller.StandardProcessorNode;
-import org.apache.nifi.controller.annotation.OnConfigured;
 import org.apache.nifi.controller.service.ControllerServiceNode;
 import org.apache.nifi.controller.service.ControllerServiceProvider;
 import org.apache.nifi.encrypt.StringEncryptor;
@@ -203,7 +202,7 @@ public final class StandardProcessScheduler implements ProcessScheduler {
                             }
 
                             try (final NarCloseable x = NarCloseable.withNarLoader()) {
-                                ReflectionUtils.invokeMethodsWithAnnotations(OnScheduled.class, OnConfigured.class, reportingTask, taskNode.getConfigurationContext());
+                                ReflectionUtils.invokeMethodsWithAnnotation(OnScheduled.class, reportingTask, taskNode.getConfigurationContext());
                             }
 
                             agent.schedule(taskNode, scheduleState);
@@ -254,7 +253,7 @@ public final class StandardProcessScheduler implements ProcessScheduler {
 
                     try {
                         try (final NarCloseable x = NarCloseable.withNarLoader()) {
-                            ReflectionUtils.invokeMethodsWithAnnotations(OnUnscheduled.class, org.apache.nifi.processor.annotation.OnUnscheduled.class, reportingTask, configurationContext);
+                            ReflectionUtils.invokeMethodsWithAnnotation(OnUnscheduled.class, reportingTask, configurationContext);
                         }
                     } catch (final Exception e) {
                         final Throwable cause = e instanceof InvocationTargetException ? e.getCause() : e;
@@ -274,7 +273,7 @@ public final class StandardProcessScheduler implements ProcessScheduler {
                     agent.unschedule(taskNode, scheduleState);
 
                     if (scheduleState.getActiveThreadCount() == 0 && scheduleState.mustCallOnStoppedMethods()) {
-                        ReflectionUtils.quietlyInvokeMethodsWithAnnotations(OnStopped.class, org.apache.nifi.processor.annotation.OnStopped.class, reportingTask, configurationContext);
+                        ReflectionUtils.quietlyInvokeMethodsWithAnnotation(OnStopped.class, reportingTask, configurationContext);
                     }
                 }
             }

nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-api/src/main/java/org/apache/nifi/web/api/ApplicationResource.java

@@ -230,7 +230,7 @@ public abstract class ApplicationResource {
     /**
      * Generates a 201 Created response with the specified content.
      *
-     * @param uri The URI
+     * @param uri    The URI
      * @param entity entity
      * @return The response to be built
      */
@@ -241,7 +241,7 @@ public abstract class ApplicationResource {
 
     /**
      * Generates a 401 Not Authorized response with no content.
-
+     *
      * @return The response to be built
      */
     protected ResponseBuilder generateNotAuthorizedResponse() {
@@ -364,7 +364,7 @@ public abstract class ApplicationResource {
      *
      * @param httpServletRequest the request
      * @return <code>true</code> if the request represents a two-phase commit style request and is the
-     *         first of the two phases.
+     * first of the two phases.
      */
     protected boolean isValidationPhase(HttpServletRequest httpServletRequest) {
         return isTwoPhaseRequest(httpServletRequest) && httpServletRequest.getHeader(RequestReplicator.REQUEST_VALIDATION_HTTP_HEADER) != null;
@@ -420,8 +420,8 @@ public abstract class ApplicationResource {
      * Authorizes the specified Snippet with the specified request action.
      *
      * @param authorizer authorizer
-     * @param lookup lookup
+     * @param lookup     lookup
-     * @param action action
+     * @param action     action
      */
     protected void authorizeSnippet(final Snippet snippet, final Authorizer authorizer, final AuthorizableLookup lookup, final RequestAction action) {
         final Consumer<Authorizable> authorize = authorizable -> authorizable.authorize(authorizer, action);
@@ -440,8 +440,8 @@ public abstract class ApplicationResource {
      * Authorizes the specified Snippet with the specified request action.
      *
      * @param authorizer authorizer
-     * @param lookup lookup
+     * @param lookup     lookup
-     * @param action action
+     * @param action     action
      */
     protected void authorizeSnippet(final SnippetDTO snippet, final Authorizer authorizer, final AuthorizableLookup lookup, final RequestAction action) {
         final Consumer<Authorizable> authorize = authorizable -> authorizable.authorize(authorizer, action);
@@ -460,57 +460,57 @@ public abstract class ApplicationResource {
      * Executes an action through the service facade using the specified revision.
      *
      * @param serviceFacade service facade
-     * @param revision revision
+     * @param revision      revision
-     * @param authorizer authorizer
+     * @param authorizer    authorizer
-     * @param verifier verifier
+     * @param verifier      verifier
-     * @param action executor
+     * @param action        executor
      * @return the response
      */
     protected Response withWriteLock(final NiFiServiceFacade serviceFacade, final Revision revision, final AuthorizeAccess authorizer,
-        final Runnable verifier, final Supplier<Response> action) {
+                                     final Runnable verifier, final Supplier<Response> action) {
 
         final NiFiUser user = NiFiUserUtils.getNiFiUser();
         return withWriteLock(serviceFacade, authorizer, verifier, action,
-            () -> serviceFacade.claimRevision(revision, user),
+                () -> serviceFacade.claimRevision(revision, user),
-            () -> serviceFacade.cancelRevision(revision),
+                () -> serviceFacade.cancelRevision(revision),
-            () -> serviceFacade.releaseRevisionClaim(revision, user));
+                () -> serviceFacade.releaseRevisionClaim(revision, user));
     }
 
     /**
      * Executes an action through the service facade using the specified revision.
      *
      * @param serviceFacade service facade
-     * @param revisions revisions
+     * @param revisions     revisions
-     * @param authorizer authorizer
+     * @param authorizer    authorizer
-     * @param verifier verifier
+     * @param verifier      verifier
-     * @param action executor
+     * @param action        executor
      * @return the response
      */
     protected Response withWriteLock(final NiFiServiceFacade serviceFacade, final Set<Revision> revisions, final AuthorizeAccess authorizer,
-        final Runnable verifier, final Supplier<Response> action) {
+                                     final Runnable verifier, final Supplier<Response> action) {
         final NiFiUser user = NiFiUserUtils.getNiFiUser();
         return withWriteLock(serviceFacade, authorizer, verifier, action,
-            () -> serviceFacade.claimRevisions(revisions, user),
+                () -> serviceFacade.claimRevisions(revisions, user),
-            () -> serviceFacade.cancelRevisions(revisions),
+                () -> serviceFacade.cancelRevisions(revisions),
-            () -> serviceFacade.releaseRevisionClaims(revisions, user));
+                () -> serviceFacade.releaseRevisionClaims(revisions, user));
     }
 
 
     /**
      * Executes an action through the service facade using the specified revision.
      *
-     * @param serviceFacade service facade
+     * @param serviceFacade  service facade
-     * @param authorizer authorizer
+     * @param authorizer     authorizer
-     * @param verifier verifier
+     * @param verifier       verifier
-     * @param action the action to execute
+     * @param action         the action to execute
-     * @param claimRevision a callback that will claim the necessary revisions for the operation
+     * @param claimRevision  a callback that will claim the necessary revisions for the operation
      * @param cancelRevision a callback that will cancel the necessary revisions if the operation fails
-     * @param releaseClaim a callback that will release any previously claimed revision if the operation is canceled after the first phase
+     * @param releaseClaim   a callback that will release any previously claimed revision if the operation is canceled after the first phase
      * @return the response
      */
     private Response withWriteLock(
-        final NiFiServiceFacade serviceFacade, final AuthorizeAccess authorizer, final Runnable verifier, final Supplier<Response> action,
+            final NiFiServiceFacade serviceFacade, final AuthorizeAccess authorizer, final Runnable verifier, final Supplier<Response> action,
-        final Runnable claimRevision, final Runnable cancelRevision, final Runnable releaseClaim) {
+            final Runnable claimRevision, final Runnable cancelRevision, final Runnable releaseClaim) {
 
         if (isClaimCancelationPhase(httpServletRequest)) {
             releaseClaim.run();
@@ -546,10 +546,9 @@ public abstract class ApplicationResource {
     /**
      * Replicates the request to the given node
      *
-     * @param method the HTTP method
+     * @param method   the HTTP method
      * @param nodeUuid the UUID of the node to replicate the request to
      * @return the response from the node
-     *
      * @throws UnknownNodeException if the nodeUuid given does not map to any node in the cluster
      */
     protected Response replicate(final String method, final String nodeUuid) {
@@ -559,11 +558,10 @@ public abstract class ApplicationResource {
     /**
      * Replicates the request to the given node
      *
-     * @param method the HTTP method
+     * @param method   the HTTP method
-     * @param entity the Entity to replicate
+     * @param entity   the Entity to replicate
      * @param nodeUuid the UUID of the node to replicate the request to
      * @return the response from the node
-     *
      * @throws UnknownNodeException if the nodeUuid given does not map to any node in the cluster
      */
     protected Response replicate(final String method, final Object entity, final String nodeUuid) {
@@ -573,11 +571,10 @@ public abstract class ApplicationResource {
     /**
      * Replicates the request to the given node
      *
-     * @param method the HTTP method
+     * @param method   the HTTP method
-     * @param entity the Entity to replicate
+     * @param entity   the Entity to replicate
      * @param nodeUuid the UUID of the node to replicate the request to
      * @return the response from the node
-     *
      * @throws UnknownNodeException if the nodeUuid given does not map to any node in the cluster
      */
     protected Response replicate(final String method, final Object entity, final String nodeUuid, final Map<String, String> headersToOverride) {
@@ -630,8 +627,8 @@ public abstract class ApplicationResource {
      * used will be those provided by the {@link #getHeaders()} method. The URI that will be used will be
      * that provided by the {@link #getAbsolutePath()} method
      *
-     * @param method the HTTP method to use
+     * @param method            the HTTP method to use
-     * @param entity the entity to replicate
+     * @param entity            the entity to replicate
      * @param headersToOverride the headers to override
      * @return the response from the request
      */
@@ -647,7 +644,7 @@ public abstract class ApplicationResource {
 
     /**
      * @return <code>true</code> if connected to a cluster, <code>false</code>
-     *         if running in standalone mode or disconnected from cluster
+     * if running in standalone mode or disconnected from cluster
      */
     boolean isConnectedToCluster() {
         return clusterCoordinator != null && clusterCoordinator.isConnected();

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/EncryptContent.java

@@ -511,7 +511,6 @@ public class EncryptContent extends AbstractProcessor {
         } catch (final ProcessException e) {
             logger.error("Cannot {}crypt {} - ", new Object[]{encrypt ? "en" : "de", flowFile, e});
             session.transfer(flowFile, REL_FAILURE);
-            return;
         }
     }
 

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-reporting-tasks/pom.xml

@@ -56,5 +56,16 @@
             <artifactId>mockito-all</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.nifi</groupId>
+            <artifactId>nifi-framework-core</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.nifi</groupId>
+            <artifactId>nifi-nar-utils</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-reporting-tasks/src/main/java/org/apache/nifi/controller/MonitorMemory.java

@@ -16,11 +16,11 @@
  */
 package org.apache.nifi.controller;
 
-import java.lang.management.GarbageCollectorMXBean;
 import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryPoolMXBean;
 import java.lang.management.MemoryUsage;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 import java.util.regex.Pattern;
@@ -28,6 +28,7 @@ import java.util.regex.Pattern;
 import org.apache.nifi.annotation.documentation.CapabilityDescription;
 import org.apache.nifi.annotation.documentation.Tags;
 import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.AllowableValue;
 import org.apache.nifi.components.PropertyDescriptor;
 import org.apache.nifi.components.ValidationContext;
 import org.apache.nifi.components.ValidationResult;
@@ -91,15 +92,26 @@ import org.slf4j.LoggerFactory;
         + " that the memory pool is exceeding this threshold.")
 public class MonitorMemory extends AbstractReportingTask {
 
+    private static final AllowableValue[] memPoolAllowableValues;
+
+    static {
+        List<MemoryPoolMXBean> memoryPoolBeans = ManagementFactory.getMemoryPoolMXBeans();
+        memPoolAllowableValues = new AllowableValue[memoryPoolBeans.size()];
+        for (int i = 0; i < memPoolAllowableValues.length; i++) {
+            memPoolAllowableValues[i] = new AllowableValue(memoryPoolBeans.get(i).getName());
+        }
+    }
+
     public static final PropertyDescriptor MEMORY_POOL_PROPERTY = new PropertyDescriptor.Builder()
             .name("Memory Pool")
+            .displayName("Memory Pool")
             .description("The name of the JVM Memory Pool to monitor")
             .required(true)
-            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .allowableValues(memPoolAllowableValues)
-            .defaultValue(null)
             .build();
     public static final PropertyDescriptor THRESHOLD_PROPERTY = new PropertyDescriptor.Builder()
             .name("Usage Threshold")
+            .displayName("Usage Threshold")
             .description("Indicates the threshold at which warnings should be generated")
             .required(true)
             .addValidator(new ThresholdValidator())
@@ -107,6 +119,7 @@ public class MonitorMemory extends AbstractReportingTask {
             .build();
     public static final PropertyDescriptor REPORTING_INTERVAL = new PropertyDescriptor.Builder()
             .name("Reporting Interval")
+            .displayName("Reporting Interval")
             .description("Indicates how often this reporting task should report bulletins while the memory utilization exceeds the configured threshold")
             .required(false)
             .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR)
@@ -121,22 +134,23 @@ public class MonitorMemory extends AbstractReportingTask {
 
     private volatile MemoryPoolMXBean monitoredBean;
     private volatile String threshold = "65%";
-    private volatile long lastReportTime = 0L;
+    private volatile long lastReportTime;
     private volatile long reportingIntervalMillis;
-    private volatile boolean lastValueWasExceeded = false;
+    private volatile boolean lastValueWasExceeded;
 
-    private final List<GarbageCollectorMXBean> garbageCollectorBeans = new ArrayList<>();
+    private final static List<PropertyDescriptor> propertyDescriptors;
 
-    public MonitorMemory() {
+    static {
+        List<PropertyDescriptor> _propertyDescriptors = new ArrayList<>();
+        _propertyDescriptors.add(MEMORY_POOL_PROPERTY);
+        _propertyDescriptors.add(THRESHOLD_PROPERTY);
+        _propertyDescriptors.add(REPORTING_INTERVAL);
+        propertyDescriptors = Collections.unmodifiableList(_propertyDescriptors);
     }
 
     @Override
     protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
-        final List<PropertyDescriptor> descriptors = new ArrayList<>(3);
+        return propertyDescriptors;
-        descriptors.add(MEMORY_POOL_PROPERTY);
-        descriptors.add(THRESHOLD_PROPERTY);
-        descriptors.add(REPORTING_INTERVAL);
-        return descriptors;
     }
 
     @OnScheduled
@@ -145,7 +159,6 @@ public class MonitorMemory extends AbstractReportingTask {
         final String thresholdValue = config.getProperty(THRESHOLD_PROPERTY).getValue().trim();
         threshold = thresholdValue;
 
-        // validate reporting interval
         final Long reportingIntervalValue = config.getProperty(REPORTING_INTERVAL).asTimePeriod(TimeUnit.MILLISECONDS);
         if (reportingIntervalValue == null) {
             reportingIntervalMillis = config.getSchedulingPeriod(TimeUnit.MILLISECONDS);
@@ -154,30 +167,21 @@ public class MonitorMemory extends AbstractReportingTask {
         }
 
         final List<MemoryPoolMXBean> memoryPoolBeans = ManagementFactory.getMemoryPoolMXBeans();
-        for (final MemoryPoolMXBean bean : memoryPoolBeans) {
+        for (int i = 0; i < memoryPoolBeans.size() && monitoredBean == null; i++) {
-            final String memoryPoolName = bean.getName();
+            MemoryPoolMXBean memoryPoolBean = memoryPoolBeans.get(i);
+            String memoryPoolName = memoryPoolBean.getName();
             if (desiredMemoryPoolName.equals(memoryPoolName)) {
-                monitoredBean = bean;
+                monitoredBean = memoryPoolBean;
-                if (DATA_SIZE_PATTERN.matcher(thresholdValue).matches()) {
+                if (memoryPoolBean.isCollectionUsageThresholdSupported()) {
-                    final long bytes = DataUnit.parseDataSize(thresholdValue, DataUnit.B).longValue();
+                    long calculatedThreshold;
-                    if (bean.isCollectionUsageThresholdSupported()) {
+                    if (DATA_SIZE_PATTERN.matcher(thresholdValue).matches()) {
-                        bean.setCollectionUsageThreshold(bytes);
+                        calculatedThreshold = DataUnit.parseDataSize(thresholdValue, DataUnit.B).longValue();
+                    } else {
+                        final String percentage = thresholdValue.substring(0, thresholdValue.length() - 1);
+                        final double pct = Double.parseDouble(percentage) / 100D;
+                        calculatedThreshold = (long) (monitoredBean.getUsage().getMax() * pct);
                     }
-                } else {
+                    monitoredBean.setUsageThreshold(calculatedThreshold);
-                    final String percentage = thresholdValue.substring(0, thresholdValue.length() - 1);
-                    final double pct = Double.parseDouble(percentage) / 100D;
-                    final long calculatedThreshold = (long) (bean.getUsage().getMax() * pct);
-                    if (bean.isCollectionUsageThresholdSupported()) {
-                        bean.setCollectionUsageThreshold(calculatedThreshold);
-                    }
-                }
-            }
-        }
-
-        for (final GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
-            for (final String memoryPoolName : bean.getMemoryPoolNames()) {
-                if (desiredMemoryPoolName.equals(memoryPoolName)) {
-                    garbageCollectorBeans.add(bean);
                 }
             }
         }
@@ -187,16 +191,6 @@ public class MonitorMemory extends AbstractReportingTask {
         }
     }
 
-    private long calculateThresholdBytes(final long maxBytes) {
-        if (DATA_SIZE_PATTERN.matcher(threshold).matches()) {
-            return DataUnit.parseDataSize(threshold, DataUnit.B).longValue();
-        } else {
-            final String percentage = threshold.substring(0, threshold.length() - 1);
-            final double pct = Double.parseDouble(percentage) / 100D;
-            return (long) (maxBytes * pct);
-        }
-    }
-
     @Override
     public void onTrigger(final ReportingContext context) {
         final MemoryPoolMXBean bean = monitoredBean;
@@ -204,17 +198,15 @@ public class MonitorMemory extends AbstractReportingTask {
             return;
         }
 
-        final MemoryUsage usage = bean.getCollectionUsage();
+        final MemoryUsage usage = bean.getUsage();
         if (usage == null) {
             logger.warn("{} could not determine memory usage for pool with name {}", this,
                     context.getProperty(MEMORY_POOL_PROPERTY));
             return;
         }
 
-        final boolean exceeded = usage.getUsed() > calculateThresholdBytes(usage.getMax());
         final double percentageUsed = (double) usage.getUsed() / (double) usage.getMax() * 100D;
-
+        if (bean.isUsageThresholdExceeded()) {
-        if (exceeded) {
             if (System.currentTimeMillis() < reportingIntervalMillis + lastReportTime && lastReportTime > 0L) {
                 return;
             }

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-reporting-tasks/src/test/java/org/apache/nifi/controller/MonitorMemoryTest.java

@@ -0,0 +1,138 @@
+/*
+ * 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.nifi.controller;
+
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+
+import java.io.File;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.nifi.admin.service.AuditService;
+import org.apache.nifi.admin.service.KeyService;
+import org.apache.nifi.controller.repository.FlowFileEventRepository;
+import org.apache.nifi.provenance.MockProvenanceEventRepository;
+import org.apache.nifi.util.CapturingLogger;
+import org.apache.nifi.util.NiFiProperties;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.slf4j.Logger;
+
+public class MonitorMemoryTest {
+
+    private FlowController fc;
+
+    @Before
+    public void before() throws Exception {
+        System.setProperty("nifi.properties.file.path", "src/test/resources/nifi.properties");
+        NiFiProperties.getInstance().setProperty(NiFiProperties.ADMINISTRATIVE_YIELD_DURATION, "1 sec");
+        NiFiProperties.getInstance().setProperty(NiFiProperties.STATE_MANAGEMENT_CONFIG_FILE, "target/test-classes/state-management.xml");
+        NiFiProperties.getInstance().setProperty(NiFiProperties.STATE_MANAGEMENT_LOCAL_PROVIDER_ID, "local-provider");
+        fc = this.buildFlowControllerForTest();
+    }
+
+    @After
+    public void after() throws Exception {
+        FileUtils.deleteDirectory(new File("./target/test-repo"));
+        FileUtils.deleteDirectory(new File("./target/content_repository"));
+        fc.shutdown(true);
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void validatevalidationKicksInOnWrongPoolNames() throws Exception {
+        ReportingTaskNode reportingTask = fc.createReportingTask(MonitorMemory.class.getName());
+        reportingTask.setProperty(MonitorMemory.MEMORY_POOL_PROPERTY.getName(), "foo");
+        ProcessScheduler ps = fc.getProcessScheduler();
+        ps.schedule(reportingTask);
+    }
+
+    @Test
+    public void validateWarnWhenPercentThresholdReached() throws Exception {
+        this.doValidate("10%");
+    }
+
+    /*
+     * We're ignoring this tests as it is practically impossible to run it
+     * reliably together with automated Maven build since we can't control the
+     * state of the JVM on each machine during the build. However, you can run
+     * it selectively for further validation
+     */
+    @Test
+    @Ignore
+    public void validateWarnWhenSizeThresholdReached() throws Exception {
+        this.doValidate("10 MB");
+    }
+
+    public void doValidate(String threshold) throws Exception {
+        CapturingLogger capturingLogger = this.wrapAndReturnCapturingLogger();
+        ReportingTaskNode reportingTask = fc.createReportingTask(MonitorMemory.class.getName());
+        reportingTask.setScheduldingPeriod("1 sec");
+        reportingTask.setProperty(MonitorMemory.MEMORY_POOL_PROPERTY.getName(), "PS Old Gen");
+        reportingTask.setProperty(MonitorMemory.REPORTING_INTERVAL.getName(), "100 millis");
+        reportingTask.setProperty(MonitorMemory.THRESHOLD_PROPERTY.getName(), threshold);
+
+        ProcessScheduler ps = fc.getProcessScheduler();
+        ps.schedule(reportingTask);
+
+        Thread.sleep(2000);
+        // ensure no memory warning were issued
+        assertTrue(capturingLogger.getWarnMessages().size() == 0);
+
+        // throw something on the heap
+        @SuppressWarnings("unused")
+        byte[] b = new byte[Integer.MAX_VALUE / 3];
+        Thread.sleep(200);
+        assertTrue(capturingLogger.getWarnMessages().size() > 0);
+        assertTrue(capturingLogger.getWarnMessages().get(0).getMsg()
+                .startsWith("Memory Pool 'PS Old Gen' has exceeded the configured Threshold of " + threshold));
+
+        // now try to clear the heap and see memory being reclaimed
+        b = null;
+        System.gc();
+        Thread.sleep(1000);
+        assertTrue(capturingLogger.getInfoMessages().get(0).getMsg().startsWith(
+                "Memory Pool 'PS Old Gen' is no longer exceeding the configured Threshold of " + threshold));
+    }
+
+    private CapturingLogger wrapAndReturnCapturingLogger() throws Exception {
+        Field loggerField = MonitorMemory.class.getDeclaredField("logger");
+        Field modifiersField = Field.class.getDeclaredField("modifiers");
+        modifiersField.setAccessible(true);
+        modifiersField.setInt(loggerField, loggerField.getModifiers() & ~Modifier.FINAL);
+
+        loggerField.setAccessible(true);
+        CapturingLogger capturingLogger = new CapturingLogger((Logger) loggerField.get(null));
+        loggerField.set(null, capturingLogger);
+        return capturingLogger;
+    }
+
+    private FlowController buildFlowControllerForTest() throws Exception {
+        NiFiProperties properties = NiFiProperties.getInstance();
+
+        properties.setProperty(NiFiProperties.PROVENANCE_REPO_IMPLEMENTATION_CLASS,
+                MockProvenanceEventRepository.class.getName());
+        properties.setProperty("nifi.remote.input.socket.port", "");
+        properties.setProperty("nifi.remote.input.secure", "");
+
+        return FlowController.createStandaloneInstance(mock(FlowFileEventRepository.class), properties,
+                mock(KeyService.class), mock(AuditService.class), null, null);
+    }
+}

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-reporting-tasks/src/test/resources/nifi.properties

@@ -0,0 +1,31 @@
+# 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.
+
+# Core Properties #
+nifi.version=nifi-test 0.*
+nifi.flow.configuration.file=./target/flow.xml.gz
+nifi.flow.configuration.archive.dir=./target/archive/
+
+nifi.reporting.task.configuration.file=./target/reporting-tasks.xml
+nifi.controller.service.configuration.file=./target/controller-services.xml
+nifi.templates.directory=./target/templates
+nifi.nar.library.directory=./target/lib
+nifi.nar.working.directory=./target/work/nar/
+
+# FlowFile Repository
+nifi.flowfile.repository.directory=./target/test-repo
+
+# Content Repository
+nifi.content.repository.directory.default=./target/content_repository

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-reporting-tasks/src/test/resources/state-management.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!--
+  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.
+-->
+<!--
+    This file lists the authority providers to use when running securely. In order
+    to use a specific provider it must be configured here and it's identifier
+    must be specified in the nifi.properties file.
+-->
+<stateManagement>
+    <!--
+      This file provides a mechanism for defining and configuring the State Providers
+      that should be used for storing state locally and across a NiFi cluster.
+    -->
+    
+    <!--
+        State Provider that stores state locally in a configurable directory. This Provider requires the following properties:
+        
+        Directory - the directory to store components' state in. If the directory being used is a sub-directory of the NiFi installation, it
+                    is important that the directory be copied over to the new version when upgrading NiFi.
+     -->
+    <local-provider>
+        <id>local-provider</id>
+        <class>org.apache.nifi.controller.state.providers.local.WriteAheadLocalStateProvider</class>
+        <property name="Directory">target/test-classes/access-control/state-management</property>
+    </local-provider>
+</stateManagement>