| /** |
| * 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.hazelcast.list; |
| |
| import java.util.Map; |
| |
| import com.hazelcast.core.Hazelcast; |
| import com.hazelcast.core.HazelcastInstance; |
| import com.hazelcast.core.IList; |
| |
| import org.apache.camel.Endpoint; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Producer; |
| import org.apache.camel.component.hazelcast.HazelcastComponentHelper; |
| import org.apache.camel.component.hazelcast.HazelcastConstants; |
| import org.apache.camel.impl.DefaultProducer; |
| |
| /** |
| * Implementation of Hazelcast List {@link Producer}. |
| */ |
| public class HazelcastListProducer extends DefaultProducer { |
| |
| private final IList<Object> list; |
| private final HazelcastComponentHelper helper = new HazelcastComponentHelper(); |
| private HazelcastInstance hazelcastInstance; |
| |
| public HazelcastListProducer(HazelcastInstance hazelcastInstance, Endpoint endpoint, String listName) { |
| super(endpoint); |
| this.hazelcastInstance = hazelcastInstance; |
| this.list = hazelcastInstance.getList(listName); |
| } |
| |
| public void process(Exchange exchange) throws Exception { |
| |
| Map<String, Object> headers = exchange.getIn().getHeaders(); |
| |
| // get header parameters |
| int operation = -1; |
| Integer pos = null; |
| |
| if (headers.containsKey(HazelcastConstants.OBJECT_POS)) { |
| if (!(headers.get(HazelcastConstants.OBJECT_POS) instanceof Integer)) { |
| throw new IllegalArgumentException("OBJECT_POS Should be of type Integer"); |
| } |
| pos = (Integer) headers.get(HazelcastConstants.OBJECT_POS); |
| } |
| |
| if (headers.containsKey(HazelcastConstants.OPERATION)) { |
| if (headers.get(HazelcastConstants.OPERATION) instanceof String) { |
| operation = helper.lookupOperationNumber((String) headers.get(HazelcastConstants.OPERATION)); |
| } else { |
| operation = (Integer) headers.get(HazelcastConstants.OPERATION); |
| } |
| } |
| |
| switch (operation) { |
| |
| case HazelcastConstants.ADD_OPERATION: |
| this.add(pos, exchange); |
| break; |
| |
| case HazelcastConstants.GET_OPERATION: |
| this.get(pos, exchange); |
| break; |
| |
| case HazelcastConstants.SETVALUE_OPERATION: |
| this.set(pos, exchange); |
| break; |
| |
| case HazelcastConstants.REMOVEVALUE_OPERATION: |
| this.remove(pos, exchange); |
| break; |
| |
| default: |
| throw new IllegalArgumentException(String.format("The value '%s' is not allowed for parameter '%s' on the LIST cache.", operation, HazelcastConstants.OPERATION)); |
| } |
| |
| // finally copy headers |
| HazelcastComponentHelper.copyHeaders(exchange); |
| } |
| |
| private void add(Integer pos, Exchange exchange) { |
| final Object body = exchange.getIn().getBody(); |
| if (null == pos) { |
| // add the specified element to the end of the list |
| list.add(body); |
| } else { |
| // add the specified element at the specified position |
| list.add(pos, body); |
| } |
| } |
| |
| private void get(Integer pos, Exchange exchange) { |
| // TODO: this operation is currently not supported by hazelcast |
| exchange.getOut().setBody(this.list.get(pos)); |
| } |
| |
| private void set(Integer pos, Exchange exchange) { |
| // TODO: this operation is currently not supported by hazelcast |
| if (null == pos) { |
| throw new IllegalArgumentException("Empty position for set operation."); |
| } else { |
| final Object body = exchange.getIn().getBody(); |
| list.set(pos, body); |
| } |
| } |
| |
| private void remove(Integer pos, Exchange exchange) { |
| if (null == pos) { |
| // removes the first occurrence in the list |
| final Object body = exchange.getIn().getBody(); |
| list.remove(body); |
| } else { |
| // TODO: this operation is currently not supported by hazelcast |
| // removes the element at the specified position |
| int position = pos; |
| list.remove(position); |
| } |
| } |
| } |