[HWKMETRICS-148]

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/handler/AvailabilityHandler.java

@@ -104,6 +104,9 @@ public class AvailabilityHandler {
     public void createAvailabilityMetric(
             @Suspended final AsyncResponse asyncResponse,
             @ApiParam(required = true) Metric<AvailabilityType> metric,
+            @ApiParam(value = "Overwrite previously created metric configuration if it exists. "
+                    + "Only data retention and tags are overwriten; existing data points are unnafected. Defaults to false.",
+                    required = false) @DefaultValue("false") @QueryParam("overwrite") Boolean overwrite,
             @Context UriInfo uriInfo
     ) {
         if (metric.getType() != null
@@ -116,7 +119,7 @@ public void createAvailabilityMetric(
         metric = new Metric<>(
                 new MetricId<>(tenantId, AVAILABILITY, metric.getMetricId().getName()), metric.getTags(),
                 metric.getDataRetention());
-        metricsService.createMetric(metric).subscribe(new MetricCreatedObserver(asyncResponse, location));
+        metricsService.createMetric(metric, overwrite).subscribe(new MetricCreatedObserver(asyncResponse, location));
     }
 
     @GET

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/handler/CounterHandler.java

@@ -109,6 +109,9 @@ public class CounterHandler {
     public void createCounter(
             @Suspended final AsyncResponse asyncResponse,
             @ApiParam(required = true) Metric<Long> metric,
+            @ApiParam(value = "Overwrite previously created metric configuration if it exists. "
+                    + "Only data retention and tags are overwriten; existing data points are unnafected. Defaults to false.",
+                    required = false) @DefaultValue("false") @QueryParam("overwrite") Boolean overwrite,
             @Context UriInfo uriInfo
     ) {
         if (metric.getType() != null
@@ -121,7 +124,7 @@ public void createCounter(
         metric = new Metric<>(new MetricId<>(tenantId, COUNTER, metric.getId()),
                 metric.getTags(), metric.getDataRetention());
         URI location = uriInfo.getBaseUriBuilder().path("/counters/{id}").build(metric.getMetricId().getName());
-        metricsService.createMetric(metric).subscribe(new MetricCreatedObserver(asyncResponse, location));
+        metricsService.createMetric(metric, overwrite).subscribe(new MetricCreatedObserver(asyncResponse, location));
     }
 
     @GET

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/handler/GaugeHandler.java

@@ -106,6 +106,9 @@ public class GaugeHandler {
     public void createGaugeMetric(
             @Suspended final AsyncResponse asyncResponse,
             @ApiParam(required = true) Metric<Double> metric,
+            @ApiParam(value = "Overwrite previously created metric configuration if it exists. "
+                    + "Only data retention and tags are overwriten; existing data points are unnafected. Defaults to false.",
+                    required = false) @DefaultValue("false") @QueryParam("overwrite") Boolean overwrite,
             @Context UriInfo uriInfo
     ) {
         if (metric.getType() != null
@@ -117,7 +120,7 @@ public void createGaugeMetric(
         metric = new Metric<>(new MetricId<>(tenantId, GAUGE, metric.getId()), metric.getTags(),
                 metric.getDataRetention());
         URI location = uriInfo.getBaseUriBuilder().path("/gauges/{id}").build(metric.getMetricId().getName());
-        metricsService.createMetric(metric).subscribe(new MetricCreatedObserver(asyncResponse, location));
+        metricsService.createMetric(metric, overwrite).subscribe(new MetricCreatedObserver(asyncResponse, location));
     }
 
     @GET

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/handler/MetricHandler.java

@@ -31,6 +31,7 @@
 
 import javax.inject.Inject;
 import javax.ws.rs.Consumes;
+import javax.ws.rs.DefaultValue;
 import javax.ws.rs.GET;
 import javax.ws.rs.HeaderParam;
 import javax.ws.rs.POST;
@@ -100,6 +101,8 @@ public class MetricHandler {
     public <T> void createMetric(
             @Suspended final AsyncResponse asyncResponse,
             @ApiParam(required = true) Metric<T> metric,
+            @ApiParam(value = "Overwrite previously created metric if it exists. Defaults to false.",
+                    required = false) @DefaultValue("false") @QueryParam("overwrite") Boolean overwrite,
             @Context UriInfo uriInfo
     ) {
         if (metric.getType() == null || !metric.getType().isUserType()) {
@@ -109,7 +112,7 @@ public <T> void createMetric(
         metric = new Metric<>(id, metric.getTags(), metric.getDataRetention());
         URI location = uriInfo.getBaseUriBuilder().path("/{type}/{id}").build(MetricTypeTextConverter.getLongForm(id
                 .getType()), id.getName());
-        metricsService.createMetric(metric).subscribe(new MetricCreatedObserver(asyncResponse, location));
+        metricsService.createMetric(metric, overwrite).subscribe(new MetricCreatedObserver(asyncResponse, location));
     }
 
     @GET

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/handler/TenantsHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates
+ * Copyright 2014-2016 Red Hat, Inc. and/or its affiliates
  * and other contributors as indicated by the @author tags.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -25,10 +25,12 @@
 
 import javax.inject.Inject;
 import javax.ws.rs.Consumes;
+import javax.ws.rs.DefaultValue;
 import javax.ws.rs.GET;
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
+import javax.ws.rs.QueryParam;
 import javax.ws.rs.container.AsyncResponse;
 import javax.ws.rs.container.Suspended;
 import javax.ws.rs.core.Context;
@@ -73,10 +75,14 @@ public class TenantsHandler {
     public void createTenant(
             @Suspended AsyncResponse asyncResponse,
             @ApiParam(required = true) TenantDefinition tenantDefinition,
+            @ApiParam(value = "Overwrite previously created tenant configuration if it exists. "
+                    + "Only data retention settings are overwriten; existing metrics and data points are unnafected. "
+                    + "Defaults to false.",
+                    required = false) @DefaultValue("false") @QueryParam("overwrite") Boolean overwrite,
             @Context UriInfo uriInfo
     ) {
         URI location = uriInfo.getBaseUriBuilder().path("/tenants").build();
-        metricsService.createTenant(tenantDefinition.toTenant())
+        metricsService.createTenant(tenantDefinition.toTenant(), overwrite)
                 .subscribe(new TenantCreatedObserver(asyncResponse, location));
     }
 

core/metrics-core-service/src/main/java/org/hawkular/metrics/core/service/DataAccess.java

@@ -37,15 +37,14 @@
  * @author John Sanda
  */
 public interface DataAccess {
-    Observable<ResultSet> insertTenant(String tenantId);
 
-    Observable<ResultSet> insertTenant(Tenant tenant);
+    Observable<ResultSet> insertTenant(Tenant tenant, boolean overwrite);
 
     Observable<Row> findAllTenantIds();
 
     Observable<Row> findTenant(String id);
 
-    <T> ResultSetFuture insertMetricInMetricsIndex(Metric<T> metric);
+    <T> ResultSetFuture insertMetricInMetricsIndex(Metric<T> metric, boolean overwrite);
 
     <T> Observable<Row> findMetric(MetricId<T> id);
 

core/metrics-core-service/src/main/java/org/hawkular/metrics/core/service/DataAccessImpl.java

@@ -63,7 +63,7 @@ public class DataAccessImpl implements DataAccess {
 
     private PreparedStatement insertTenant;
 
-    private PreparedStatement insertTenantId;
+    private PreparedStatement insertTenantOverwrite;
 
     private PreparedStatement findAllTenantIds;
 
@@ -73,6 +73,8 @@ public class DataAccessImpl implements DataAccess {
 
     private PreparedStatement insertIntoMetricsIndex;
 
+    private PreparedStatement insertIntoMetricsIndexOverwrite;
+
     private PreparedStatement findMetric;
 
     private PreparedStatement getMetricTags;
@@ -146,11 +148,12 @@ public DataAccessImpl(Session session) {
     }
 
     protected void initPreparedStatements() {
-        insertTenantId = session.prepare("INSERT INTO tenants (id) VALUES (?)");
-
         insertTenant = session.prepare(
             "INSERT INTO tenants (id, retentions) VALUES (?, ?) IF NOT EXISTS");
 
+        insertTenantOverwrite = session.prepare(
+                "INSERT INTO tenants (id, retentions) VALUES (?, ?)");
+
         findAllTenantIds = session.prepare("SELECT DISTINCT id FROM tenants");
 
         findAllTenantIdsFromMetricsIdx = session.prepare("SELECT DISTINCT tenant_id, type FROM metrics_idx");
@@ -180,6 +183,10 @@ protected void initPreparedStatements() {
             "VALUES (?, ?, ?, ?, ?) " +
             "IF NOT EXISTS");
 
+        insertIntoMetricsIndexOverwrite = session.prepare(
+            "INSERT INTO metrics_idx (tenant_id, type, metric, data_retention, tags) " +
+            "VALUES (?, ?, ?, ?, ?) ");
+
         updateMetricsIndex = session.prepare(
             "INSERT INTO metrics_idx (tenant_id, type, metric) VALUES (?, ?, ?)");
 
@@ -332,14 +339,15 @@ protected void initPreparedStatements() {
                 "WHERE tenant_id = ? AND tname = ? AND tvalue = ?");
     }
 
-    @Override public Observable<ResultSet> insertTenant(String tenantId) {
-        return rxSession.execute(insertTenantId.bind(tenantId));
-    }
-
     @Override
-    public Observable<ResultSet> insertTenant(Tenant tenant) {
+    public Observable<ResultSet> insertTenant(Tenant tenant, boolean overwrite) {
         Map<String, Integer> retentions = tenant.getRetentionSettings().entrySet().stream()
                 .collect(toMap(entry -> entry.getKey().getText(), Map.Entry::getValue));
+
+        if (overwrite) {
+            return rxSession.execute(insertTenantOverwrite.bind(tenant.getId(), retentions));
+        }
+
         return rxSession.execute(insertTenant.bind(tenant.getId(), retentions));
     }
 
@@ -355,8 +363,15 @@ public Observable<Row> findTenant(String id) {
     }
 
     @Override
-    public <T> ResultSetFuture insertMetricInMetricsIndex(Metric<T> metric) {
+    public <T> ResultSetFuture insertMetricInMetricsIndex(Metric<T> metric, boolean overwrite) {
         MetricId<T> metricId = metric.getMetricId();
+
+        if (overwrite) {
+            return session.executeAsync(
+                    insertIntoMetricsIndexOverwrite.bind(metricId.getTenantId(), metricId.getType().getCode(),
+                            metricId.getName(), metric.getDataRetention(), metric.getTags()));
+        }
+
         return session.executeAsync(insertIntoMetricsIndex.bind(metricId.getTenantId(), metricId.getType().getCode(),
                 metricId.getName(), metric.getDataRetention(), metric.getTags()));
     }

core/metrics-core-service/src/main/java/org/hawkular/metrics/core/service/MetricsService.java

@@ -57,11 +57,12 @@ public interface MetricsService {
      *
      * @param tenant
      *            The {@link Tenant tenant} to create
+     * @param overwrite Flag to force overwrite previous tenant definition if it exists
      * @return void
      * @throws org.hawkular.metrics.core.api.exception.TenantAlreadyExistsException
      *             tenant already exists
      */
-    Observable<Void> createTenant(Tenant tenant);
+    Observable<Void> createTenant(Tenant tenant, boolean overwrite);
 
     Observable<Tenant> getTenants();
 
@@ -84,13 +85,14 @@ public interface MetricsService {
      * </p>
      *
      * @param metric The metric to create
+     * @param overwrite Flag to force overwrite previous metric definition if it exists
      *
      * @return This method only has side effects and does not return any data. As such,
      * {@link rx.Observer#onNext(Object) onNext} is not called. {@link rx.Observer#onCompleted()}  onCompleted}
      * is called when the operation completes successfully, and {@link rx.Observer#onError(Throwable)}  onError}
      * is called when it fails.
      */
-    Observable<Void> createMetric(Metric<?> metric);
+    Observable<Void> createMetric(Metric<?> metric, boolean overwrite);
 
     <T> Observable<Metric<T>> findMetric(MetricId<T> id);
 

core/metrics-core-service/src/main/java/org/hawkular/metrics/core/service/MetricsServiceImpl.java

@@ -341,9 +341,9 @@ public void setDefaultTTL(int defaultTTL) {
     }
 
     @Override
-    public Observable<Void> createTenant(final Tenant tenant) {
+    public Observable<Void> createTenant(final Tenant tenant, boolean overwrite) {
         return Observable.create(subscriber -> {
-            Observable<Void> updates = dataAccess.insertTenant(tenant).flatMap(resultSet -> {
+            Observable<Void> updates = dataAccess.insertTenant(tenant, overwrite).flatMap(resultSet -> {
                 if (!resultSet.wasApplied()) {
                     throw new TenantAlreadyExistsException(tenant.getId());
                 }
@@ -382,19 +382,18 @@ private List<String> loadTenantIds() {
     }
 
     @Override
-    public Observable<Void> createMetric(Metric<?> metric) {
+    public Observable<Void> createMetric(Metric<?> metric, boolean overwrite) {
         MetricType<?> metricType = metric.getMetricId().getType();
         if (!metricType.isUserType()) {
             throw new IllegalArgumentException(metric + " cannot be created. " + metricType + " metrics are " +
                     "internally generated metrics and cannot be created by clients.");
         }
 
-        ResultSetFuture future = dataAccess.insertMetricInMetricsIndex(metric);
+        ResultSetFuture future = dataAccess.insertMetricInMetricsIndex(metric, overwrite);
         Observable<ResultSet> indexUpdated = ListenableFutureObservable.from(future, metricsTasks);
         return Observable.create(subscriber -> indexUpdated.subscribe(resultSet -> {
-            if (!resultSet.wasApplied()) {
+            if (!overwrite && !resultSet.wasApplied()) {
                 subscriber.onError(new MetricAlreadyExistsException(metric));
-
             } else {
                 // TODO Need error handling if either of the following updates fail
                 // If adding tags/retention fails, then we want to report the error to the

core/metrics-core-service/src/test/java/org/hawkular/metrics/core/service/DataAccessITest.java

@@ -78,9 +78,9 @@ public void insertAndFindTenant() throws Exception {
         Tenant tenant2 = new Tenant("tenant-2", ImmutableMap.of(GAUGE, 14));
 
 
-        dataAccess.insertTenant(tenant1).toBlocking().lastOrDefault(null);
+        dataAccess.insertTenant(tenant1, false).toBlocking().lastOrDefault(null);
 
-        dataAccess.insertTenant(tenant2).toBlocking().lastOrDefault(null);
+        dataAccess.insertTenant(tenant2, false).toBlocking().lastOrDefault(null);
 
         Tenant actual = dataAccess.findTenant(tenant1.getId())
                                   .map(Functions::getTenant)
@@ -90,8 +90,8 @@ public void insertAndFindTenant() throws Exception {
 
     @Test
     public void doNotAllowDuplicateTenants() throws Exception {
-        dataAccess.insertTenant(new Tenant("tenant-1")).toBlocking().lastOrDefault(null);
-        ResultSet resultSet = dataAccess.insertTenant(new Tenant("tenant-1"))
+        dataAccess.insertTenant(new Tenant("tenant-1"), false).toBlocking().lastOrDefault(null);
+        ResultSet resultSet = dataAccess.insertTenant(new Tenant("tenant-1"), false)
                                         .toBlocking()
                                         .lastOrDefault(null);
         assertFalse(resultSet.wasApplied(), "Tenants should not be overwritten");

core/metrics-core-service/src/test/java/org/hawkular/metrics/core/service/DelegatingDataAccess.java

@@ -45,13 +45,8 @@ public DelegatingDataAccess(DataAccess delegate) {
     }
 
     @Override
-    public Observable<ResultSet> insertTenant(String tenantId) {
-        return delegate.insertTenant(tenantId);
-    }
-
-    @Override
-    public Observable<ResultSet> insertTenant(Tenant tenant) {
-        return delegate.insertTenant(tenant);
+    public Observable<ResultSet> insertTenant(Tenant tenant, boolean overwrite) {
+        return delegate.insertTenant(tenant, overwrite);
     }
 
     @Override
@@ -65,8 +60,8 @@ public Observable<Row> findTenant(String id) {
     }
 
     @Override
-    public <T> ResultSetFuture insertMetricInMetricsIndex(Metric<T> metric) {
-        return delegate.insertMetricInMetricsIndex(metric);
+    public <T> ResultSetFuture insertMetricInMetricsIndex(Metric<T> metric, boolean overwrite) {
+        return delegate.insertMetricInMetricsIndex(metric, overwrite);
     }
 
     @Override

core/metrics-core-service/src/test/java/org/hawkular/metrics/core/service/GenerateRateITest.java

@@ -79,9 +79,9 @@ public void generateRates() {
         Metric<Long> c2 = new Metric<>(new MetricId<>(tenant, COUNTER, "C2"));
         Metric<Long> c3 = new Metric<>(new MetricId<>(tenant, COUNTER, "C3"));
 
-        doAction(() -> metricsService.createMetric(c1));
-        doAction(() -> metricsService.createMetric(c2));
-        doAction(() -> metricsService.createMetric(c3));
+        doAction(() -> metricsService.createMetric(c1, false));
+        doAction(() -> metricsService.createMetric(c2, false));
+        doAction(() -> metricsService.createMetric(c3, false));
 
         doAction(() -> metricsService.addDataPoints(COUNTER, Observable.from(asList(
                 new Metric<>(c1.getMetricId(), asList(new DataPoint<>(start.getMillis(), 10L),