| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * 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.onlab.onos.store.service.impl; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| |
| import org.onlab.onos.cluster.DefaultControllerNode; |
| import org.onlab.onos.cluster.NodeId; |
| import org.onlab.packet.IpAddress; |
| import org.slf4j.Logger; |
| |
| import com.fasterxml.jackson.core.JsonEncoding; |
| import com.fasterxml.jackson.core.JsonFactory; |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| |
| /** |
| * Allows for reading and writing tablet definition as a JSON file. |
| */ |
| public class TabletDefinitionStore { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| private final File file; |
| |
| /** |
| * Creates a reader/writer of the tablet definition file. |
| * |
| * @param filePath location of the definition file |
| */ |
| public TabletDefinitionStore(String filePath) { |
| file = new File(filePath); |
| } |
| |
| /** |
| * Creates a reader/writer of the tablet definition file. |
| * |
| * @param filePath location of the definition file |
| */ |
| public TabletDefinitionStore(File filePath) { |
| file = checkNotNull(filePath); |
| } |
| |
| /** |
| * Returns the Map from tablet name to set of initial member nodes. |
| * |
| * @return Map from tablet name to set of initial member nodes |
| * @throws IOException when I/O exception of some sort has occurred. |
| */ |
| public Map<String, Set<DefaultControllerNode>> read() throws IOException { |
| |
| final Map<String, Set<DefaultControllerNode>> tablets = new HashMap<>(); |
| |
| final ObjectMapper mapper = new ObjectMapper(); |
| final ObjectNode tabletNodes = (ObjectNode) mapper.readTree(file); |
| final Iterator<Entry<String, JsonNode>> fields = tabletNodes.fields(); |
| while (fields.hasNext()) { |
| final Entry<String, JsonNode> next = fields.next(); |
| final Set<DefaultControllerNode> nodes = new HashSet<>(); |
| final Iterator<JsonNode> elements = next.getValue().elements(); |
| while (elements.hasNext()) { |
| ObjectNode nodeDef = (ObjectNode) elements.next(); |
| nodes.add(new DefaultControllerNode(new NodeId(nodeDef.get("id").asText()), |
| IpAddress.valueOf(nodeDef.get("ip").asText()), |
| nodeDef.get("tcpPort").asInt(9876))); |
| } |
| |
| tablets.put(next.getKey(), nodes); |
| } |
| return tablets; |
| } |
| |
| /** |
| * Updates the Map from tablet name to set of member nodes. |
| * |
| * @param tabletName name of the tablet to update |
| * @param nodes set of initial member nodes |
| * @throws IOException when I/O exception of some sort has occurred. |
| */ |
| public void write(String tabletName, Set<DefaultControllerNode> nodes) throws IOException { |
| checkNotNull(tabletName); |
| checkArgument(tabletName.isEmpty(), "Tablet name cannot be empty"); |
| // TODO should validate if tabletName is allowed in JSON |
| |
| // load current |
| Map<String, Set<DefaultControllerNode>> config; |
| try { |
| config = read(); |
| } catch (IOException e) { |
| log.info("Reading tablet config failed, assuming empty definition."); |
| config = new HashMap<>(); |
| } |
| // update with specified |
| config.put(tabletName, nodes); |
| |
| // write back to file |
| final ObjectMapper mapper = new ObjectMapper(); |
| final ObjectNode tabletNodes = mapper.createObjectNode(); |
| for (Entry<String, Set<DefaultControllerNode>> tablet : config.entrySet()) { |
| ArrayNode nodeDefs = mapper.createArrayNode(); |
| tabletNodes.set(tablet.getKey(), nodeDefs); |
| |
| for (DefaultControllerNode node : tablet.getValue()) { |
| ObjectNode nodeDef = mapper.createObjectNode(); |
| nodeDef.put("id", node.id().toString()) |
| .put("ip", node.ip().toString()) |
| .put("tcpPort", node.tcpPort()); |
| nodeDefs.add(nodeDef); |
| } |
| } |
| mapper.writeTree(new JsonFactory().createGenerator(file, JsonEncoding.UTF8), |
| tabletNodes); |
| } |
| |
| } |