| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.camel.component.pgevent; |
| |
| import java.sql.PreparedStatement; |
| |
| import com.impossibl.postgres.api.jdbc.PGConnection; |
| import com.impossibl.postgres.api.jdbc.PGNotificationListener; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Message; |
| import org.apache.camel.Processor; |
| import org.apache.camel.support.DefaultConsumer; |
| |
| /** |
| * The PgEvent consumer. |
| */ |
| public class PgEventConsumer extends DefaultConsumer implements PGNotificationListener { |
| |
| private final PgEventEndpoint endpoint; |
| private PGConnection dbConnection; |
| |
| public PgEventConsumer(PgEventEndpoint endpoint, Processor processor) { |
| super(endpoint, processor); |
| this.endpoint = endpoint; |
| } |
| |
| @Override |
| protected void doStart() throws Exception { |
| super.doStart(); |
| dbConnection = endpoint.initJdbc(); |
| String sql = String.format("LISTEN %s", endpoint.getChannel()); |
| try (PreparedStatement statement = dbConnection.prepareStatement(sql)) { |
| statement.execute(); |
| } |
| dbConnection.addNotificationListener(endpoint.getChannel(), endpoint.getChannel(), this); |
| } |
| |
| |
| public void notification(int processId, String channel, String payload) { |
| if (log.isDebugEnabled()) { |
| log.debug("Notification processId: {}, channel: {}, payload: {}", processId, channel, payload); |
| } |
| |
| Exchange exchange = endpoint.createExchange(); |
| Message msg = exchange.getIn(); |
| msg.setHeader("channel", channel); |
| msg.setBody(payload); |
| |
| try { |
| getProcessor().process(exchange); |
| } catch (Exception ex) { |
| String cause = "Unable to process incoming notification from PostgreSQL: processId='" + processId + "', channel='" + channel + "', payload='" + payload + "'"; |
| getExceptionHandler().handleException(cause, ex); |
| } |
| } |
| |
| @Override |
| protected void doStop() throws Exception { |
| if (dbConnection != null) { |
| dbConnection.removeNotificationListener(endpoint.getChannel()); |
| String sql = String.format("UNLISTEN %s", endpoint.getChannel()); |
| try (PreparedStatement statement = dbConnection.prepareStatement(sql)) { |
| statement.execute(); |
| } |
| dbConnection.close(); |
| } |
| } |
| } |