/**
* Copyright © 2016-2017 The Thingsboard Authors
*
* 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 org.thingsboard.server.extensions.core.filter;
import lombok.extern.slf4j.Slf4j;
import org.thingsboard.server.common.data.kv.KvEntry;
import org.thingsboard.server.common.msg.device.ToDeviceActorMsg;
import org.thingsboard.server.extensions.api.rules.RuleContext;
import org.thingsboard.server.extensions.api.rules.RuleFilter;
import javax.script.ScriptException;
/**
* @author Andrew Shvayka
*/
@Slf4j
public abstract class BasicJsFilter implements RuleFilter<JsFilterConfiguration> {
protected JsFilterConfiguration configuration;
protected NashornJsEvaluator evaluator;
@Override
public void init(JsFilterConfiguration configuration) {
this.configuration = configuration;
initEvaluator(configuration);
}
@Override
public boolean filter(RuleContext ctx, ToDeviceActorMsg msg) {
try {
return doFilter(ctx, msg);
} catch (ScriptException e) {
log.warn("RuleFilter evaluation exception: {}", e.getMessage(), e);
throw new RuntimeException(e);
}
}
protected abstract boolean doFilter(RuleContext ctx, ToDeviceActorMsg msg) throws ScriptException;
@Override
public void resume() {
initEvaluator(configuration);
}
@Override
public void suspend() {
destroyEvaluator();
}
@Override
public void stop() {
destroyEvaluator();
}
private void initEvaluator(JsFilterConfiguration configuration) {
evaluator = new NashornJsEvaluator(configuration.getFilter());
}
private void destroyEvaluator() {
if (evaluator != null) {
evaluator.destroy();
}
}
protected static Object getValue(KvEntry attr) {
switch (attr.getDataType()) {
case STRING:
return attr.getStrValue().get();
case LONG:
return attr.getLongValue().get();
case DOUBLE:
return attr.getDoubleValue().get();
case BOOLEAN:
return attr.getBooleanValue().get();
}
return null;
}
}