114 lines
3.9 KiB
Java
114 lines
3.9 KiB
Java
/*
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* Copyright (c) 2017 SUSE LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package monasca.persister.repository.cassandra;
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import java.security.NoSuchAlgorithmException;
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import java.sql.SQLException;
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import java.sql.Timestamp;
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import javax.inject.Inject;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.PropertyNamingStrategy;
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import io.dropwizard.setup.Environment;
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import monasca.common.model.event.AlarmStateTransitionedEvent;
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import monasca.persister.configuration.PersisterConfig;
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import monasca.persister.repository.Repo;
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import monasca.persister.repository.RepoException;
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/**
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* This class is not thread safe.
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*
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*/
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public class CassandraAlarmRepo extends CassandraRepo implements Repo<AlarmStateTransitionedEvent> {
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private static final Logger logger = LoggerFactory.getLogger(CassandraAlarmRepo.class);
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private static String EMPTY_REASON_DATA = "{}";
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private static final int MAX_BYTES_PER_CHAR = 4;
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private static final int MAX_LENGTH_VARCHAR = 65000;
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private int retention;
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private ObjectMapper objectMapper = new ObjectMapper();
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@Inject
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public CassandraAlarmRepo(CassandraCluster cluster, PersisterConfig config, Environment environment)
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throws NoSuchAlgorithmException, SQLException {
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super(cluster, environment, config.getCassandraDbConfiguration().getMaxWriteRetries(),
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config.getAlarmHistoryConfiguration().getBatchSize());
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this.retention = config.getCassandraDbConfiguration().getRetentionPolicy() * 24 * 3600;
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logger.debug("Instantiating " + this.getClass().getName());
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this.objectMapper
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.setPropertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES);
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session = cluster.getAlarmsSession();
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logger.debug(this.getClass().getName() + " is fully instantiated");
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}
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public void addToBatch(AlarmStateTransitionedEvent message, String id) {
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String metricsString = getSerializedString(message.metrics, id);
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// Validate metricsString does not exceed a sufficient maximum upper bound
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if (metricsString.length() * MAX_BYTES_PER_CHAR >= MAX_LENGTH_VARCHAR) {
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metricsString = "[]";
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logger.warn("length of metricsString for alarm ID {} exceeds max length of {}", message.alarmId,
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MAX_LENGTH_VARCHAR);
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}
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String subAlarmsString = getSerializedString(message.subAlarms, id);
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if (subAlarmsString.length() * MAX_BYTES_PER_CHAR >= MAX_LENGTH_VARCHAR) {
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subAlarmsString = "[]";
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logger.warn("length of subAlarmsString for alarm ID {} exceeds max length of {}", message.alarmId,
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MAX_LENGTH_VARCHAR);
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}
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queue.offerLast(cluster.getAlarmHistoryInsertStmt().bind(retention, metricsString, message.oldState.name(),
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message.newState.name(), subAlarmsString, message.stateChangeReason, EMPTY_REASON_DATA,
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message.tenantId, message.alarmId, new Timestamp(message.timestamp)));
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}
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private String getSerializedString(Object o, String id) {
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try {
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return this.objectMapper.writeValueAsString(o);
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} catch (JsonProcessingException e) {
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logger.error("[[}]: failed to serialize object {}", id, o, e);
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return "";
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}
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}
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@Override
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public int flush(String id) throws RepoException {
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return handleFlush(id);
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}
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}
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