Java tutorial
/* * Copyright 2002-2013 the original author or authors. * * 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.springframework.data.gemfire.support; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.springframework.data.gemfire.GemfireTemplate; import org.springframework.util.CollectionUtils; import com.fasterxml.jackson.databind.ObjectMapper; import com.gemstone.gemfire.cache.Region; import com.gemstone.gemfire.cache.query.SelectResults; import com.gemstone.gemfire.cache.query.internal.ResultsBag; import com.gemstone.gemfire.pdx.JSONFormatter; import com.gemstone.gemfire.pdx.PdxInstance; /** * @author David Turanski */ @Aspect @SuppressWarnings("unused") public class JSONRegionAdvice { private boolean convertReturnedCollections = true; private boolean prettyPrint = false; private List<String> includedRegions; protected final Log log = LogFactory.getLog(JSONRegionAdvice.class); /** * Flag to convert collections returned from cache from @{link PdxInstance} to JSON String. If the returned * collections are very large, overhead will be incurred to covert all the values from from * Region.getAll() and Region.values() * * @param convertReturnedCollections true by default */ public void setConvertReturnedCollections(boolean convertReturnedCollections) { this.convertReturnedCollections = convertReturnedCollections; } /** * Sets regions to be included for JSON conversion. By default, all regions will be included * * @param regions a List of region names to include */ public void setIncludedRegions(List<Region<?, ?>> regions) { this.includedRegions = new ArrayList<String>(); for (Region<?, ?> region : regions) { includedRegions.add(region.getName()); } } /** * Sets names of regions to be included for JSON conversion. By default, all regions will be included * * @param regionNames a List of region names to include */ public void setIncludedRegionNames(List<String> regionNames) { this.includedRegions = regionNames; } /** * Flag to print JSON Strings with proper indentation, etc. * * @param prettyPrint false be default */ public void setPrettyPrint(boolean prettyPrint) { this.prettyPrint = prettyPrint; } @Around("execution(* com.gemstone.gemfire.cache.Region.put(..)) || " + "execution(* com.gemstone.gemfire.cache.Region.create(..)) ||" + "execution(* com.gemstone.gemfire.cache.Region.putIfAbsent(..)) ||" + "execution(* com.gemstone.gemfire.cache.Region.replace(..))") public Object put(ProceedingJoinPoint pjp) { boolean JSONRegion = isIncludedSONRegion(pjp.getTarget()); Object returnValue = null; try { if (JSONRegion) { Object[] newArgs = Arrays.copyOf(pjp.getArgs(), pjp.getArgs().length); Object val = newArgs[1]; newArgs[1] = convertArgumentToPdxInstance(val); returnValue = pjp.proceed(newArgs); log.debug("converting " + returnValue + " to JSON string"); returnValue = convertPdxInstanceToJSONString(returnValue); } else { returnValue = pjp.proceed(); } } catch (Throwable t) { handleThrowable(t); } return returnValue; } @Around("execution(* com.gemstone.gemfire.cache.Region.putAll(..))") public Object putAll(ProceedingJoinPoint pjp) { boolean JSONRegion = isIncludedSONRegion(pjp.getTarget()); Object returnValue = null; try { if (JSONRegion) { Object[] newArgs = Arrays.copyOf(pjp.getArgs(), pjp.getArgs().length); Map<?, ?> val = (Map<?, ?>) newArgs[0]; Map<Object, Object> newArg = new HashMap<Object, Object>(); for (Entry<?, ?> entry : val.entrySet()) { newArg.put(entry.getKey(), convertArgumentToPdxInstance(entry.getValue())); } newArgs[0] = newArg; returnValue = pjp.proceed(newArgs); } else { returnValue = pjp.proceed(); } } catch (Throwable t) { handleThrowable(t); } return returnValue; } @Around("execution(* com.gemstone.gemfire.cache.Region.get(..)) " + "|| execution(* com.gemstone.gemfire.cache.Region.selectValue(..))" + "|| execution(* com.gemstone.gemfire.cache.Region.remove(..))") public Object get(ProceedingJoinPoint pjp) { Object returnValue = null; try { if (isIncludedSONRegion(pjp.getTarget())) { returnValue = pjp.proceed(); log.debug("converting " + returnValue + " to JSON string"); returnValue = convertPdxInstanceToJSONString(returnValue); } else { returnValue = pjp.proceed(); } } catch (Throwable t) { handleThrowable(t); } return returnValue; } @SuppressWarnings("unchecked") @Around("execution(* com.gemstone.gemfire.cache.Region.getAll(..))") public Map<Object, Object> getAll(ProceedingJoinPoint pjp) { Map<Object, Object> result = null; try { Map<Object, Object> retVal = (Map<Object, Object>) pjp.proceed(); if (!convertReturnedCollections || CollectionUtils.isEmpty(retVal) || !isIncludedSONRegion(pjp.getTarget())) { result = retVal; } else { result = new HashMap<Object, Object>(); for (Entry<Object, Object> entry : retVal.entrySet()) { result.put(entry.getKey(), convertPdxInstanceToJSONString(entry.getValue())); } } } catch (Throwable t) { handleThrowable(t); } return result; } @SuppressWarnings("unchecked") @Around("execution(* com.gemstone.gemfire.cache.Region.values(..))") public Collection<Object> values(ProceedingJoinPoint pjp) { Collection<Object> result = null; try { Collection<Object> retVal = (Collection<Object>) pjp.proceed(); if (!convertReturnedCollections || CollectionUtils.isEmpty(retVal) || !isIncludedSONRegion(pjp.getTarget())) { result = retVal; } else { result = new ArrayList<Object>(); for (Object obj : retVal) { result.add(convertArgumentToPdxInstance(obj)); } } } catch (Throwable t) { handleThrowable(t); } return result; } @Around("execution(* org.springframework.data.gemfire.GemfireOperations.find(..)) " + "|| execution(* org.springframework.data.gemfire.GemfireOperations.findUnique(..)) " + "|| execution(* org.springframework.data.gemfire.GemfireOperations.query(..))") public Object templateQuery(ProceedingJoinPoint pjp) { GemfireTemplate template = (GemfireTemplate) pjp.getTarget(); boolean jsonRegion = isIncludedSONRegion(template.getRegion()); Object returnValue = null; try { if (jsonRegion) { returnValue = pjp.proceed(); if (returnValue instanceof SelectResults && convertReturnedCollections) { ResultsBag resultsBag = new ResultsBag(); for (Object obj : (SelectResults<?>) returnValue) { resultsBag.add(convertPdxInstanceToJSONString(obj)); } returnValue = resultsBag; } else { returnValue = convertPdxInstanceToJSONString(returnValue); } } else { returnValue = pjp.proceed(); } } catch (Throwable t) { handleThrowable(t); } return returnValue; } private PdxInstance convertArgumentToPdxInstance(Object value) { PdxInstance pdx = null; if (value instanceof PdxInstance) { pdx = (PdxInstance) value; } else if (value instanceof String) { pdx = JSONFormatter.fromJSON((String) value); } else { ObjectMapper mapper = new ObjectMapper(); try { String json = mapper.writeValueAsString(value); pdx = JSONFormatter.fromJSON(json); } catch (Throwable t) { handleThrowable(t); } } return pdx; } private boolean isIncludedSONRegion(Object target) { Region<?, ?> region = (Region<?, ?>) target; boolean result = false; if (includedRegions == null || includedRegions.contains(region.getName())) { if (log.isDebugEnabled()) { log.debug(region.getName() + " is included for JSON conversion"); } result = true; } return result; } private Object convertPdxInstanceToJSONString(Object returnValue) { Object result = returnValue; if (returnValue != null && returnValue instanceof PdxInstance) { result = JSONFormatter.toJSON((PdxInstance) returnValue); if (!prettyPrint) { result = flattenString(result); } } return result; } private Object flattenString(Object result) { if (result instanceof String) { String json = (String) result; return json.replaceAll("\\s*", ""); } return result; } private void handleThrowable(Throwable t) { if (t instanceof RuntimeException) { throw (RuntimeException) t; } else { throw new RuntimeException(t); } } }