[improve][core]增加聚合函数LAST_VALUE和FIRST_VALUE

9 files changed, 293 insertions, 5 deletions

diff --git a/config/udf.plugins b/config/udf.plugins
index b3f67b4..2978bbe 100644
--- a/config/udf.plugins
+++ b/config/udf.plugins
@@ -19,4 +19,6 @@ com.geedgenetworks.core.udf.udaf.NumberSum
 com.geedgenetworks.core.udf.udaf.CollectList
 com.geedgenetworks.core.udf.udaf.CollectSet
 com.geedgenetworks.core.udf.udaf.LongCount
-com.geedgenetworks.core.udf.udaf.Mean
\ No newline at end of file
+com.geedgenetworks.core.udf.udaf.Mean
+com.geedgenetworks.core.udf.udaf.LastValue
+com.geedgenetworks.core.udf.udaf.FirstValue
\ No newline at end of file
diff --git a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectList.java b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectList.java
index 0345b7b..4a43163 100644
--- a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectList.java
+++ b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectList.java
@@ -39,7 +39,7 @@ public class CollectList implements AggregateFunction {
             throw new GrootStreamRuntimeException(CommonErrorCode.ILLEGAL_ARGUMENT, "Missing required parameters");
         }
         this.lookupField  = udfContext.getLookup_fields().get(0);
-        if(!udfContext.getOutput_fields().isEmpty()) {
+        if(udfContext.getOutput_fields()!=null && !udfContext.getOutput_fields().isEmpty()) {
             this.outputField = udfContext.getOutput_fields().get(0);
         }
         else {
diff --git a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectSet.java b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectSet.java
index 7891f93..a425118 100644
--- a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectSet.java
+++ b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/CollectSet.java
@@ -26,7 +26,7 @@ public class CollectSet implements AggregateFunction {
             throw new GrootStreamRuntimeException(CommonErrorCode.ILLEGAL_ARGUMENT, "Missing required parameters");
         }
         this.lookupField  = udfContext.getLookup_fields().get(0);
-        if(!udfContext.getOutput_fields().isEmpty()) {
+        if(udfContext.getOutput_fields()!=null && !udfContext.getOutput_fields().isEmpty()) {
             this.outputField = udfContext.getOutput_fields().get(0);
         }
         else {
diff --git a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/FirstValue.java b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/FirstValue.java
new file mode 100644
index 0000000..27490ef
--- /dev/null
+++ b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/FirstValue.java
@@ -0,0 +1,73 @@
+/**
+  * Copyright 2017 Hortonworks.
+  *
+  * Licensed 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 com.geedgenetworks.core.udf.udaf;
+
+
+import com.geedgenetworks.common.Accumulator;
+import com.geedgenetworks.common.Event;
+import com.geedgenetworks.common.exception.CommonErrorCode;
+import com.geedgenetworks.common.exception.GrootStreamRuntimeException;
+import com.geedgenetworks.common.udf.AggregateFunction;
+import com.geedgenetworks.common.udf.UDFContext;
+
+/**
+ * Collects elements within a group and returns the list of aggregated objects
+ */
+public class FirstValue implements AggregateFunction {
+
+    private String lookupField;
+    private String outputField;
+
+
+    @Override
+    public Accumulator open(UDFContext udfContext,Accumulator acc) {
+        if(udfContext.getLookup_fields()==null ){
+            throw new GrootStreamRuntimeException(CommonErrorCode.ILLEGAL_ARGUMENT, "Missing required parameters");
+        }
+        this.lookupField  = udfContext.getLookup_fields().get(0);
+        if(udfContext.getOutput_fields()!=null && !udfContext.getOutput_fields().isEmpty()) {
+            this.outputField = udfContext.getOutput_fields().get(0);
+        }
+        else {
+            outputField = lookupField;
+        }
+        return acc;
+    }
+
+
+    @Override
+    public Accumulator add(Event event, Accumulator acc) {
+        if(!acc.getMetricsFields().containsKey(outputField) && event.getExtractedFields().containsKey(lookupField)){
+            acc.getMetricsFields().put(outputField, event.getExtractedFields().get(lookupField));
+        }
+        return acc;
+    }
+
+    @Override
+    public String functionName() {
+        return "FIRST_VALUE";
+    }
+
+    @Override
+    public Accumulator getResult(Accumulator acc) {
+        return acc;
+    }
+
+    @Override
+    public void close() {
+
+    }
+}
diff --git a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/LastValue.java b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/LastValue.java
new file mode 100644
index 0000000..4adafd4
--- /dev/null
+++ b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/LastValue.java
@@ -0,0 +1,76 @@
+/**
+  * Copyright 2017 Hortonworks.
+  *
+  * Licensed 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 com.geedgenetworks.core.udf.udaf;
+
+
+import com.geedgenetworks.common.Accumulator;
+import com.geedgenetworks.common.Event;
+import com.geedgenetworks.common.exception.CommonErrorCode;
+import com.geedgenetworks.common.exception.GrootStreamRuntimeException;
+import com.geedgenetworks.common.udf.AggregateFunction;
+import com.geedgenetworks.common.udf.UDFContext;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Collects elements within a group and returns the list of aggregated objects
+ */
+public class LastValue implements AggregateFunction {
+
+    private String lookupField;
+    private String outputField;
+
+
+    @Override
+    public Accumulator open(UDFContext udfContext,Accumulator acc) {
+        if(udfContext.getLookup_fields()==null ){
+            throw new GrootStreamRuntimeException(CommonErrorCode.ILLEGAL_ARGUMENT, "Missing required parameters");
+        }
+        this.lookupField  = udfContext.getLookup_fields().get(0);
+        if(udfContext.getOutput_fields()!=null && !udfContext.getOutput_fields().isEmpty()) {
+            this.outputField = udfContext.getOutput_fields().get(0);
+        }
+        else {
+            outputField = lookupField;
+        }
+        return acc;
+    }
+
+
+    @Override
+    public Accumulator add(Event event, Accumulator acc) {
+        if(event.getExtractedFields().containsKey(lookupField)){
+            acc.getMetricsFields().put(outputField, event.getExtractedFields().get(lookupField));
+        }
+        return acc;
+    }
+
+    @Override
+    public String functionName() {
+        return "LAST_VALUE";
+    }
+
+    @Override
+    public Accumulator getResult(Accumulator acc) {
+        return acc;
+    }
+
+    @Override
+    public void close() {
+
+    }
+}
diff --git a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/Mean.java b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/Mean.java
index a3f098b..380f598 100644
--- a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/Mean.java
+++ b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/Mean.java
@@ -23,7 +23,7 @@ public class Mean implements AggregateFunction {
             throw new GrootStreamRuntimeException(CommonErrorCode.ILLEGAL_ARGUMENT, "Missing required parameters");
         }
         lookupField  = udfContext.getLookup_fields().get(0);
-        if(!udfContext.getOutput_fields().isEmpty()) {
+        if(udfContext.getOutput_fields()!=null && !udfContext.getOutput_fields().isEmpty()) {
             outputField = udfContext.getOutput_fields().get(0);
         }
         else {
diff --git a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/NumberSum.java b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/NumberSum.java
index d92df5c..4ed3143 100644
--- a/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/NumberSum.java
+++ b/groot-core/src/main/java/com/geedgenetworks/core/udf/udaf/NumberSum.java
@@ -19,7 +19,7 @@ public class NumberSum implements AggregateFunction {
             throw new GrootStreamRuntimeException(CommonErrorCode.ILLEGAL_ARGUMENT, "Missing required parameters");
         }
         lookupField  = udfContext.getLookup_fields().get(0);
-        if(!udfContext.getOutput_fields().isEmpty()) {
+        if(udfContext.getOutput_fields()!=null && !udfContext.getOutput_fields().isEmpty()) {
             outputField = udfContext.getOutput_fields().get(0);
         }
         else {
diff --git a/groot-core/src/test/java/com/geedgenetworks/core/udf/test/aggregate/FirstValueTest.java b/groot-core/src/test/java/com/geedgenetworks/core/udf/test/aggregate/FirstValueTest.java
new file mode 100644
index 0000000..2c4d460
--- /dev/null
+++ b/groot-core/src/test/java/com/geedgenetworks/core/udf/test/aggregate/FirstValueTest.java
@@ -0,0 +1,67 @@
+/**
+  * Copyright 2017 Hortonworks.
+  *
+  * Licensed 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 com.geedgenetworks.core.udf.test.aggregate;
+
+
+import com.geedgenetworks.common.Accumulator;
+import com.geedgenetworks.common.Event;
+import com.geedgenetworks.common.udf.UDFContext;
+import com.geedgenetworks.core.udf.udaf.CollectSet;
+import com.geedgenetworks.core.udf.udaf.FirstValue;
+import org.junit.jupiter.api.Test;
+
+import java.text.ParseException;
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class FirstValueTest {
+
+    @Test
+    public void testNumberSumTest() throws ParseException {
+
+        List<String> arr = List.of("192.168.1.1", "192.168.1.2", "192.168.1.3", "192.168.1.4","192.168.1.4");
+        excute(arr);
+
+    }
+
+    private static void excute(List<String> arr) throws ParseException {
+
+        UDFContext udfContext = new UDFContext();
+        udfContext.setLookup_fields(List.of("field"));
+        udfContext.setOutput_fields(Collections.singletonList("field_first"));
+        FirstValue firstValue = new FirstValue();
+        Map<String, Object> metricsFields = new HashMap<>();
+        Accumulator accumulator = new Accumulator();
+        accumulator.setMetricsFields(metricsFields);
+        Accumulator agg = firstValue.open(udfContext,accumulator);
+
+        for (String o : arr) {
+            Event event = new Event();
+            Map<String, Object> extractedFields = new HashMap<>();
+            extractedFields.put("field", o);
+            event.setExtractedFields(extractedFields);
+            agg = firstValue.add(event, agg);
+
+        }
+        Accumulator result = firstValue.getResult(agg);
+        String val = (String) result.getMetricsFields().get("field_first");
+        assertEquals(val,"192.168.1.1");
+    }
+
+
+
+}
\ No newline at end of file
diff --git a/groot-core/src/test/java/com/geedgenetworks/core/udf/test/aggregate/LastValueTest.java b/groot-core/src/test/java/com/geedgenetworks/core/udf/test/aggregate/LastValueTest.java
new file mode 100644
index 0000000..e9609f7
--- /dev/null
+++ b/groot-core/src/test/java/com/geedgenetworks/core/udf/test/aggregate/LastValueTest.java
@@ -0,0 +1,70 @@
+/**
+  * Copyright 2017 Hortonworks.
+  *
+  * Licensed 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 com.geedgenetworks.core.udf.test.aggregate;
+
+
+import com.geedgenetworks.common.Accumulator;
+import com.geedgenetworks.common.Event;
+import com.geedgenetworks.common.udf.UDFContext;
+import com.geedgenetworks.core.udf.udaf.FirstValue;
+import com.geedgenetworks.core.udf.udaf.LastValue;
+import org.junit.jupiter.api.Test;
+
+import java.text.ParseException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class LastValueTest {
+
+    @Test
+    public void testNumberSumTest() throws ParseException {
+
+        List<String> arr = List.of("192.168.1.1", "192.168.1.2", "192.168.1.3", "192.168.1.4","192.168.1.4");
+        excute(arr);
+
+    }
+
+    private static void excute(List<String> arr) throws ParseException {
+
+        UDFContext udfContext = new UDFContext();
+        udfContext.setLookup_fields(List.of("field"));
+        udfContext.setOutput_fields(Collections.singletonList("field_last"));
+        LastValue lastValue = new LastValue();
+        Map<String, Object> metricsFields = new HashMap<>();
+        Accumulator accumulator = new Accumulator();
+        accumulator.setMetricsFields(metricsFields);
+        Accumulator agg = lastValue.open(udfContext,accumulator);
+
+        for (String o : arr) {
+            Event event = new Event();
+            Map<String, Object> extractedFields = new HashMap<>();
+            extractedFields.put("field", o);
+            event.setExtractedFields(extractedFields);
+            agg = lastValue.add(event, agg);
+
+        }
+        Accumulator result = lastValue.getResult(agg);
+        String val = (String) result.getMetricsFields().get("field_last");
+        assertEquals(val,"192.168.1.4");
+    }
+
+
+
+}
\ No newline at end of file