/*
* Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.siddhi.core.query.selector.attribute.aggregator;
import org.wso2.siddhi.annotation.Example;
import org.wso2.siddhi.annotation.Extension;
import org.wso2.siddhi.annotation.Parameter;
import org.wso2.siddhi.annotation.ReturnAttribute;
import org.wso2.siddhi.annotation.util.DataType;
import org.wso2.siddhi.core.config.ExecutionPlanContext;
import org.wso2.siddhi.core.exception.OperationNotSupportedException;
import org.wso2.siddhi.core.executor.ExpressionExecutor;
import org.wso2.siddhi.core.util.config.ConfigReader;
import org.wso2.siddhi.query.api.definition.Attribute;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* {@link AttributeAggregator} to calculate min value for life time based on an event attribute.
*/
@Extension(
name = "minForever",
namespace = "",
description = "This is the attribute aggregator to store the minimum value for a given attribute throughout " +
"the lifetime of the query regardless of any windows in-front.",
parameters = {
@Parameter(name = "arg",
description = "The value that needs to be compared to find the minimum value.",
type = {DataType.INT, DataType.LONG, DataType.DOUBLE, DataType.FLOAT})
},
returnAttributes = @ReturnAttribute(
description = "Returns the minimum value in the same data type as the input.",
type = {DataType.INT, DataType.LONG, DataType.DOUBLE, DataType.FLOAT}),
examples = @Example(
syntax = "from inputStream\n" +
"select minForever(temp) as max\n" +
"insert into outputStream;",
description = "minForever(temp) returns the minimum temp value recorded for all the events throughout" +
"the lifetime of the query."
)
)
public class MinForeverAttributeAggregator extends AttributeAggregator {
private MinForeverAttributeAggregator minForeverAttributeAggregator;
/**
* The initialization method for FunctionExecutor
* @param attributeExpressionExecutors are the executors of each attributes in the function
* @param configReader
* @param executionPlanContext Execution plan runtime context
*/
@Override
protected void init(ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader,
ExecutionPlanContext executionPlanContext) {
if (attributeExpressionExecutors.length != 1) {
throw new OperationNotSupportedException("MinForever aggregator has to have exactly 1 parameter, " +
"currently " + attributeExpressionExecutors.length + " parameters provided");
}
Attribute.Type type = attributeExpressionExecutors[0].getReturnType();
switch (type) {
case FLOAT:
minForeverAttributeAggregator = new MinForeverAttributeAggregatorFloat();
break;
case INT:
minForeverAttributeAggregator = new MinForeverAttributeAggregatorInt();
break;
case LONG:
minForeverAttributeAggregator = new MinForeverAttributeAggregatorLong();
break;
case DOUBLE:
minForeverAttributeAggregator = new MinForeverAttributeAggregatorDouble();
break;
default:
throw new OperationNotSupportedException("MinForever not supported for " + type);
}
}
public Attribute.Type getReturnType() {
return minForeverAttributeAggregator.getReturnType();
}
@Override
public Object processAdd(Object data) {
return minForeverAttributeAggregator.processAdd(data);
}
@Override
public Object processAdd(Object[] data) {
// will not occur
return new IllegalStateException("MinForever cannot process data array, but found " +
Arrays.deepToString(data));
}
@Override
public Object processRemove(Object data) {
return minForeverAttributeAggregator.processRemove(data);
}
@Override
public Object processRemove(Object[] data) {
// will not occur
return new IllegalStateException("MinForever cannot process data array, but found " +
Arrays.deepToString(data));
}
@Override
public Object reset() {
return minForeverAttributeAggregator.reset();
}
@Override
public void start() {
//Nothing to start
}
@Override
public void stop() {
//nothing to stop
}
@Override
public Map<String, Object> currentState() {
return minForeverAttributeAggregator.currentState();
}
@Override
public void restoreState(Map<String, Object> state) {
minForeverAttributeAggregator.restoreState(state);
}
class MinForeverAttributeAggregatorDouble extends MinForeverAttributeAggregator {
private final Attribute.Type type = Attribute.Type.DOUBLE;
private volatile Double minValue = null;
public Attribute.Type getReturnType() {
return type;
}
@Override
public synchronized Object processAdd(Object data) {
Double value = (Double) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public synchronized Object processRemove(Object data) {
Double value = (Double) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public Object reset() {
return minValue;
}
@Override
public Map<String, Object> currentState() {
Map<String, Object> state = new HashMap<>();
state.put("MinValue", minValue);
return state;
}
@Override
public void restoreState(Map<String, Object> state) {
minValue = (Double) state.get("MinValue");
}
}
class MinForeverAttributeAggregatorFloat extends MinForeverAttributeAggregator {
private final Attribute.Type type = Attribute.Type.FLOAT;
private volatile Float minValue = null;
public Attribute.Type getReturnType() {
return type;
}
@Override
public synchronized Object processAdd(Object data) {
Float value = (Float) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public synchronized Object processRemove(Object data) {
Float value = (Float) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public Object reset() {
return minValue;
}
@Override
public Map<String, Object> currentState() {
Map<String, Object> state = new HashMap<>();
state.put("MinValue", minValue);
return state;
}
@Override
public void restoreState(Map<String, Object> state) {
minValue = (Float) state.get("MinValue");
}
}
class MinForeverAttributeAggregatorInt extends MinForeverAttributeAggregator {
private final Attribute.Type type = Attribute.Type.INT;
private volatile Integer minValue = null;
public Attribute.Type getReturnType() {
return type;
}
@Override
public synchronized Object processAdd(Object data) {
Integer value = (Integer) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public Object reset() {
return minValue;
}
@Override
public synchronized Object processRemove(Object data) {
Integer value = (Integer) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public Map<String, Object> currentState() {
Map<String, Object> state = new HashMap<>();
state.put("MinValue", minValue);
return state;
}
@Override
public void restoreState(Map<String, Object> state) {
minValue = (Integer) state.get("MinValue");
}
}
class MinForeverAttributeAggregatorLong extends MinForeverAttributeAggregator {
private final Attribute.Type type = Attribute.Type.LONG;
private volatile Long minValue = null;
public Attribute.Type getReturnType() {
return type;
}
@Override
public synchronized Object processAdd(Object data) {
Long value = (Long) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public Object reset() {
return minValue;
}
@Override
public synchronized Object processRemove(Object data) {
Long value = (Long) data;
if (minValue == null || minValue > value) {
minValue = value;
}
return minValue;
}
@Override
public Map<String, Object> currentState() {
Map<String, Object> state = new HashMap<>();
state.put("MinValue", minValue);
return state;
}
@Override
public void restoreState(Map<String, Object> state) {
minValue = (Long) state.get("MinValue");
}
}
}