| package org.apache.helix.model; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| import org.apache.helix.HelixProperty; |
| import org.apache.helix.ZNRecord; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Current states of partitions in a resource for an instance. |
| */ |
| public class CurrentState extends HelixProperty { |
| private static Logger LOG = LoggerFactory.getLogger(CurrentState.class); |
| |
| /** |
| * Lookup keys for the current state |
| */ |
| public enum CurrentStateProperty { |
| SESSION_ID, |
| CURRENT_STATE, |
| REQUESTED_STATE, |
| INFO, |
| STATE_MODEL_DEF, |
| STATE_MODEL_FACTORY_NAME, |
| RESOURCE, |
| START_TIME, |
| END_TIME, |
| PREVIOUS_STATE, |
| TRIGGERED_BY// , |
| // BUCKET_SIZE |
| } |
| |
| /** |
| * Instantiate a current state with a resource |
| * @param resourceName name identifying the resource |
| */ |
| public CurrentState(String resourceName) { |
| super(resourceName); |
| } |
| |
| /** |
| * Instantiate a current state with a pre-populated ZNRecord |
| * @param record a ZNRecord corresponding to the current state |
| */ |
| public CurrentState(ZNRecord record) { |
| super(record); |
| } |
| |
| /** |
| * Get the name of the resource |
| * @return String resource identifier |
| */ |
| public String getResourceName() { |
| return _record.getId(); |
| } |
| |
| /** |
| * Get the partitions on this instance and the state that each partition is currently in. |
| * @return (partition, state) pairs |
| */ |
| public Map<String, String> getPartitionStateMap() { |
| Map<String, String> map = new HashMap<String, String>(); |
| Map<String, Map<String, String>> mapFields = _record.getMapFields(); |
| for (String partitionName : mapFields.keySet()) { |
| Map<String, String> tempMap = mapFields.get(partitionName); |
| if (tempMap != null) { |
| map.put(partitionName, tempMap.get(CurrentStateProperty.CURRENT_STATE.name())); |
| } |
| } |
| return map; |
| } |
| |
| /** |
| * Get the session that this current state corresponds to |
| * @return String session identifier |
| */ |
| public String getSessionId() { |
| return _record.getSimpleField(CurrentStateProperty.SESSION_ID.name()); |
| } |
| |
| /** |
| * Set the session that this current state corresponds to |
| * @param sessionId String session identifier |
| */ |
| public void setSessionId(String sessionId) { |
| _record.setSimpleField(CurrentStateProperty.SESSION_ID.name(), sessionId); |
| } |
| |
| /** |
| * Get the state of a partition on this instance |
| * @param partitionName the name of the partition |
| * @return the state, or null if the partition is not present |
| */ |
| public String getState(String partitionName) { |
| return getProperty(partitionName, CurrentStateProperty.CURRENT_STATE); |
| } |
| |
| public String getInfo(String partitionName) { |
| return getProperty(partitionName, CurrentStateProperty.INFO); |
| } |
| |
| public String getRequestedState(String partitionName) { |
| return getProperty(partitionName, CurrentStateProperty.REQUESTED_STATE); |
| } |
| |
| public long getStartTime(String partitionName) { |
| String startTime = getProperty(partitionName, CurrentStateProperty.START_TIME); |
| return startTime == null ? -1L : Long.parseLong(startTime); |
| } |
| |
| public long getEndTime(String partitionName) { |
| String endTime = getProperty(partitionName, CurrentStateProperty.END_TIME); |
| return endTime == null ? -1L : Long.parseLong(endTime); |
| } |
| |
| public String getTriggerHost(String partitionName) { |
| return getProperty(partitionName, CurrentStateProperty.TRIGGERED_BY); |
| } |
| |
| public String getPreviousState(String partitionName) { |
| return getProperty(partitionName, CurrentStateProperty.PREVIOUS_STATE); |
| } |
| |
| private String getProperty(String partitionName, CurrentStateProperty property) { |
| Map<String, String> mapField = _record.getMapField(partitionName); |
| if (mapField != null) { |
| return mapField.get(property.name()); |
| } |
| return null; |
| } |
| |
| /** |
| * Set the state model that the resource follows |
| * @param stateModelName an identifier of the state model |
| */ |
| public void setStateModelDefRef(String stateModelName) { |
| _record.setSimpleField(CurrentStateProperty.STATE_MODEL_DEF.name(), stateModelName); |
| } |
| |
| /** |
| * Get the state model that the resource follows |
| * @return an identifier of the state model |
| */ |
| public String getStateModelDefRef() { |
| return _record.getSimpleField(CurrentStateProperty.STATE_MODEL_DEF.name()); |
| } |
| |
| /** |
| * Set the state that a partition is currently in on this instance |
| * @param partitionName the name of the partition |
| * @param state the state of the partition |
| */ |
| public void setState(String partitionName, String state) { |
| setProperty(partitionName, CurrentStateProperty.CURRENT_STATE, state); |
| } |
| |
| public void setInfo(String partitionName, String info) { |
| setProperty(partitionName, CurrentStateProperty.INFO, info); |
| } |
| |
| public void setRequestedState(String partitionName, String state) { |
| setProperty(partitionName, CurrentStateProperty.REQUESTED_STATE, state); |
| } |
| |
| public void setStartTime(String partitionName, long startTime) { |
| setProperty(partitionName, CurrentStateProperty.START_TIME, String.valueOf(startTime)); |
| } |
| |
| public void setEndTime(String partitionName, long endTime) { |
| setProperty(partitionName, CurrentStateProperty.END_TIME, String.valueOf(endTime)); |
| } |
| |
| public void setTriggerHost(String partitionName, String triggerHost) { |
| setProperty(partitionName, CurrentStateProperty.TRIGGERED_BY, triggerHost); |
| } |
| |
| public void setPreviousState(String partitionName, String state) { |
| setProperty(partitionName, CurrentStateProperty.PREVIOUS_STATE, state); |
| } |
| |
| private void setProperty(String partitionName, CurrentStateProperty property, String value) { |
| Map<String, Map<String, String>> mapFields = _record.getMapFields(); |
| if (mapFields.get(partitionName) == null) { |
| mapFields.put(partitionName, new TreeMap<String, String>()); |
| } |
| mapFields.get(partitionName).put(property.name(), value); |
| } |
| |
| /** |
| * Set the state model factory |
| * @param factoryName the name of the factory |
| */ |
| public void setStateModelFactoryName(String factoryName) { |
| _record.setSimpleField(CurrentStateProperty.STATE_MODEL_FACTORY_NAME.name(), factoryName); |
| } |
| |
| /** |
| * Get the state model factory |
| * @return a name that identifies the state model factory |
| */ |
| public String getStateModelFactoryName() { |
| return _record.getSimpleField(CurrentStateProperty.STATE_MODEL_FACTORY_NAME.name()); |
| } |
| |
| // @Override |
| // public int getBucketSize() |
| // { |
| // String bucketSizeStr = |
| // _record.getSimpleField(CurrentStateProperty.BUCKET_SIZE.toString()); |
| // int bucketSize = 0; |
| // if (bucketSizeStr != null) |
| // { |
| // try |
| // { |
| // bucketSize = Integer.parseInt(bucketSizeStr); |
| // } |
| // catch (NumberFormatException e) |
| // { |
| // // OK |
| // } |
| // } |
| // return bucketSize; |
| // } |
| // |
| // @Override |
| // public void setBucketSize(int bucketSize) |
| // { |
| // if (bucketSize > 0) |
| // { |
| // _record.setSimpleField(CurrentStateProperty.BUCKET_SIZE.toString(), "" + bucketSize); |
| // } |
| // } |
| |
| @Override |
| public boolean isValid() { |
| if (getStateModelDefRef() == null) { |
| LOG.error("Current state does not contain state model ref. id:" + getResourceName()); |
| return false; |
| } |
| if (getSessionId() == null) { |
| LOG.error("CurrentState does not contain session id, id : " + getResourceName()); |
| return false; |
| } |
| return true; |
| } |
| |
| } |