Java 并发查询和删除,导致Neo4j 2.0.3社区内存泄漏
该程序模拟一台服务器,该服务器根据用户输入并发查询节点并删除它们。每个用户请求(查询和删除)都在一个单独的线程上处理 不存在编译或运行时问题,但是diffset的内存泄漏会导致最终崩溃请建议修复/解决方法。 在程序执行期间监视堆:Java 并发查询和删除,导致Neo4j 2.0.3社区内存泄漏,java,memory-leaks,neo4j,Java,Memory Leaks,Neo4j,该程序模拟一台服务器,该服务器根据用户输入并发查询节点并删除它们。每个用户请求(查询和删除)都在一个单独的线程上处理 不存在编译或运行时问题,但是diffset的内存泄漏会导致最终崩溃请建议修复/解决方法。 在程序执行期间监视堆: package net.ahm.graph; import java.io.File; import java.util.HashMap; import java.util.Map; import java.util.concurrent.CountDownLatc
package net.ahm.graph;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.DynamicLabel;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.ResourceIterable;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.graphdb.schema.IndexDefinition;
import org.neo4j.graphdb.schema.Schema;
import org.neo4j.kernel.impl.util.FileUtils;
import org.neo4j.kernel.impl.util.StringLogger;
public class DeleteLab {
private static final int CHILDREN = 10000;
private static final Logger LOG = Logger.getLogger(DeleteLab.class);
public static void main(String[] args) throws Exception {
FileUtils.deleteRecursively(new File("graphdb"));
final GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder("graphdb")
.setConfig(GraphDatabaseSettings.use_memory_mapped_buffers, "true").setConfig(GraphDatabaseSettings.cache_type, "strong")
.newGraphDatabase();
registerShutdownHook(graphDb);
LOG.info(">>>> STARTED GRAPHDB");
createIndex("Parent", "name", graphDb);
createIndex("Child", "name", graphDb);
final Node parent;
try (Transaction tx = graphDb.beginTx()) {
parent = graphDb.createNode(DynamicLabel.label("Parent"));
parent.setProperty("name", "parent");
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
for (int i = 0; i < CHILDREN; i++) {
Node child = graphDb.createNode(DynamicLabel.label("Child"));
child.setProperty("name", "child" + i);
child.setProperty("count", i);
parent.createRelationshipTo(child, RelationshipTypes.PARENT_CHILD);
}
tx.success();
}
LOG.info(">>>> CREATED NODES");
final ExecutionEngine engine = new ExecutionEngine(graphDb, StringLogger.SYSTEM);
ExecutorService es = Executors.newFixedThreadPool(50);
final CountDownLatch cdl = new CountDownLatch(CHILDREN);
for (int i = 0; i < CHILDREN; i++) {
final int count = i;
es.execute(new Runnable() {
@Override
public void run() {
try (Transaction tx = graphDb.beginTx()) {
tx.acquireWriteLock(parent);
Map<String, Object> params = new HashMap<String, Object>();
params.put("cCount", count);
ExecutionResult result = engine.execute(
"match (n:Parent)-[:PARENT_CHILD]->(m:Child) where m.count={cCount} return m.name", params);
for (Map<String, Object> row : result) {
String cName = (String) row.get("m.name");
Node child = findNode("Child", "name", cName, graphDb);
Relationship r = child.getSingleRelationship(RelationshipTypes.PARENT_CHILD, Direction.INCOMING);
r.delete();
child.delete();
}
tx.success();
} finally {
cdl.countDown();
}
}
});
}
cdl.await();
LOG.info(">>>> DELETED NODES");
es.shutdown();
}
private static void createIndex(String label, String propertyName, GraphDatabaseService graphDb) {
IndexDefinition indexDefinition;
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
indexDefinition = schema.indexFor(DynamicLabel.label(label)).on(propertyName).create();
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
schema.awaitIndexOnline(indexDefinition, 10, TimeUnit.SECONDS);
tx.success();
}
}
private static void registerShutdownHook(final GraphDatabaseService graphDb) {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
LOG.info("### GRAPHDB SHUTDOWNHOOK INVOKED !!!");
graphDb.shutdown();
}
});
}
private enum RelationshipTypes implements RelationshipType {
PARENT_CHILD
}
public static Node findNode(String labelName, String propertyName, Object propertyValue, GraphDatabaseService graphDb) {
if (propertyValue != null) {
Label label = DynamicLabel.label(labelName);
ResourceIterable<Node> ri = graphDb.findNodesByLabelAndProperty(label, propertyName, propertyValue);
if (ri != null) {
try {
ResourceIterator<Node> iter = ri.iterator();
try {
if (iter != null && iter.hasNext()) {
return iter.next();
}
} finally {
iter.close();
}
} catch (Exception e) {
LOG.error("ERROR WHILE FINDING ID: " + propertyValue + " , LABEL: " + labelName + " , PROPERTY: " + propertyName, e);
}
}
}
return null;
}
}
package net.ahm.graph;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.DynamicLabel;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.ResourceIterable;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.graphdb.schema.IndexDefinition;
import org.neo4j.graphdb.schema.Schema;
import org.neo4j.kernel.impl.util.FileUtils;
import org.neo4j.kernel.impl.util.StringLogger;
public class DeleteLab {
private static final int CHILDREN = 10000;
private static final Logger LOG = Logger.getLogger(DeleteLab.class);
public static void main(String[] args) throws Exception {
FileUtils.deleteRecursively(new File("graphdb"));
final GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder("graphdb")
.setConfig(GraphDatabaseSettings.use_memory_mapped_buffers, "true").setConfig(GraphDatabaseSettings.cache_type, "strong")
.newGraphDatabase();
registerShutdownHook(graphDb);
LOG.info(">>>> STARTED GRAPHDB");
createIndex("Parent", "name", graphDb);
createIndex("Child", "name", graphDb);
final Node parent;
try (Transaction tx = graphDb.beginTx()) {
parent = graphDb.createNode(DynamicLabel.label("Parent"));
parent.setProperty("name", "parent");
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
for (int i = 0; i < CHILDREN; i++) {
Node child = graphDb.createNode(DynamicLabel.label("Child"));
child.setProperty("name", "child" + i);
child.setProperty("count", i);
parent.createRelationshipTo(child, RelationshipTypes.PARENT_CHILD);
}
tx.success();
}
LOG.info(">>>> CREATED NODES");
final ExecutionEngine engine = new ExecutionEngine(graphDb, StringLogger.SYSTEM);
ExecutorService es = Executors.newFixedThreadPool(50);
final CountDownLatch cdl = new CountDownLatch(CHILDREN);
for (int i = 0; i < CHILDREN; i++) {
final int count = i;
es.execute(new Runnable() {
@Override
public void run() {
String cName = null;
boolean success = false;
try (Transaction tx = graphDb.beginTx()) {
while (!success) {
try {
Map<String, Object> params = new HashMap<String, Object>();
params.put("cCount", count);
ExecutionResult result = engine.execute(
"match (n:Parent)-[:PARENT_CHILD]->(m:Child) where m.count={cCount} return m.name", params);
for (Map<String, Object> row : result) {
cName = (String) row.get("m.name");
break;
}
success = true;
} catch (org.neo4j.graphdb.NotFoundException e) {
LOG.info(">>>> RETRY QUERY ON NotFoundException: " + count);
try {
Thread.sleep((long) Math.random() * 100);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
}
}
try (Transaction tx = graphDb.beginTx()) {
if (cName != null) {
tx.acquireWriteLock(parent);
Node child = findNode("Child", "name", cName, graphDb);
Relationship r = child.getSingleRelationship(RelationshipTypes.PARENT_CHILD, Direction.INCOMING);
r.delete();
child.delete();
LOG.info(">>>> DELETING NODES: " + cName);
}
tx.success();
} finally {
cdl.countDown();
}
}
});
}
cdl.await();
LOG.info(">>>> DELETED NODES");
es.shutdown();
}
private static void createIndex(String label, String propertyName, GraphDatabaseService graphDb) {
IndexDefinition indexDefinition;
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
indexDefinition = schema.indexFor(DynamicLabel.label(label)).on(propertyName).create();
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
schema.awaitIndexOnline(indexDefinition, 10, TimeUnit.SECONDS);
tx.success();
}
}
private static void registerShutdownHook(final GraphDatabaseService graphDb) {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
LOG.info("### GRAPHDB SHUTDOWNHOOK INVOKED !!!");
graphDb.shutdown();
}
});
}
private enum RelationshipTypes implements RelationshipType {
PARENT_CHILD
}
public static Node findNode(String labelName, String propertyName, Object propertyValue, GraphDatabaseService graphDb) {
if (propertyValue != null) {
Label label = DynamicLabel.label(labelName);
ResourceIterable<Node> ri = graphDb.findNodesByLabelAndProperty(label, propertyName, propertyValue);
if (ri != null) {
try {
ResourceIterator<Node> iter = ri.iterator();
try {
if (iter != null && iter.hasNext()) {
return iter.next();
}
} finally {
iter.close();
}
} catch (Exception e) {
LOG.error("ERROR WHILE FINDING ID: " + propertyValue + " , LABEL: " + labelName + " , PROPERTY: " + propertyName, e);
}
}
}
return null;
}
}
源代码:
package net.ahm.graph;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.DynamicLabel;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.ResourceIterable;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.graphdb.schema.IndexDefinition;
import org.neo4j.graphdb.schema.Schema;
import org.neo4j.kernel.impl.util.FileUtils;
import org.neo4j.kernel.impl.util.StringLogger;
public class DeleteLab {
private static final int CHILDREN = 10000;
private static final Logger LOG = Logger.getLogger(DeleteLab.class);
public static void main(String[] args) throws Exception {
FileUtils.deleteRecursively(new File("graphdb"));
final GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder("graphdb")
.setConfig(GraphDatabaseSettings.use_memory_mapped_buffers, "true").setConfig(GraphDatabaseSettings.cache_type, "strong")
.newGraphDatabase();
registerShutdownHook(graphDb);
LOG.info(">>>> STARTED GRAPHDB");
createIndex("Parent", "name", graphDb);
createIndex("Child", "name", graphDb);
final Node parent;
try (Transaction tx = graphDb.beginTx()) {
parent = graphDb.createNode(DynamicLabel.label("Parent"));
parent.setProperty("name", "parent");
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
for (int i = 0; i < CHILDREN; i++) {
Node child = graphDb.createNode(DynamicLabel.label("Child"));
child.setProperty("name", "child" + i);
child.setProperty("count", i);
parent.createRelationshipTo(child, RelationshipTypes.PARENT_CHILD);
}
tx.success();
}
LOG.info(">>>> CREATED NODES");
final ExecutionEngine engine = new ExecutionEngine(graphDb, StringLogger.SYSTEM);
ExecutorService es = Executors.newFixedThreadPool(50);
final CountDownLatch cdl = new CountDownLatch(CHILDREN);
for (int i = 0; i < CHILDREN; i++) {
final int count = i;
es.execute(new Runnable() {
@Override
public void run() {
try (Transaction tx = graphDb.beginTx()) {
tx.acquireWriteLock(parent);
Map<String, Object> params = new HashMap<String, Object>();
params.put("cCount", count);
ExecutionResult result = engine.execute(
"match (n:Parent)-[:PARENT_CHILD]->(m:Child) where m.count={cCount} return m.name", params);
for (Map<String, Object> row : result) {
String cName = (String) row.get("m.name");
Node child = findNode("Child", "name", cName, graphDb);
Relationship r = child.getSingleRelationship(RelationshipTypes.PARENT_CHILD, Direction.INCOMING);
r.delete();
child.delete();
}
tx.success();
} finally {
cdl.countDown();
}
}
});
}
cdl.await();
LOG.info(">>>> DELETED NODES");
es.shutdown();
}
private static void createIndex(String label, String propertyName, GraphDatabaseService graphDb) {
IndexDefinition indexDefinition;
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
indexDefinition = schema.indexFor(DynamicLabel.label(label)).on(propertyName).create();
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
schema.awaitIndexOnline(indexDefinition, 10, TimeUnit.SECONDS);
tx.success();
}
}
private static void registerShutdownHook(final GraphDatabaseService graphDb) {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
LOG.info("### GRAPHDB SHUTDOWNHOOK INVOKED !!!");
graphDb.shutdown();
}
});
}
private enum RelationshipTypes implements RelationshipType {
PARENT_CHILD
}
public static Node findNode(String labelName, String propertyName, Object propertyValue, GraphDatabaseService graphDb) {
if (propertyValue != null) {
Label label = DynamicLabel.label(labelName);
ResourceIterable<Node> ri = graphDb.findNodesByLabelAndProperty(label, propertyName, propertyValue);
if (ri != null) {
try {
ResourceIterator<Node> iter = ri.iterator();
try {
if (iter != null && iter.hasNext()) {
return iter.next();
}
} finally {
iter.close();
}
} catch (Exception e) {
LOG.error("ERROR WHILE FINDING ID: " + propertyValue + " , LABEL: " + labelName + " , PROPERTY: " + propertyName, e);
}
}
}
return null;
}
}
package net.ahm.graph;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.DynamicLabel;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.ResourceIterable;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.graphdb.schema.IndexDefinition;
import org.neo4j.graphdb.schema.Schema;
import org.neo4j.kernel.impl.util.FileUtils;
import org.neo4j.kernel.impl.util.StringLogger;
public class DeleteLab {
private static final int CHILDREN = 10000;
private static final Logger LOG = Logger.getLogger(DeleteLab.class);
public static void main(String[] args) throws Exception {
FileUtils.deleteRecursively(new File("graphdb"));
final GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder("graphdb")
.setConfig(GraphDatabaseSettings.use_memory_mapped_buffers, "true").setConfig(GraphDatabaseSettings.cache_type, "strong")
.newGraphDatabase();
registerShutdownHook(graphDb);
LOG.info(">>>> STARTED GRAPHDB");
createIndex("Parent", "name", graphDb);
createIndex("Child", "name", graphDb);
final Node parent;
try (Transaction tx = graphDb.beginTx()) {
parent = graphDb.createNode(DynamicLabel.label("Parent"));
parent.setProperty("name", "parent");
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
for (int i = 0; i < CHILDREN; i++) {
Node child = graphDb.createNode(DynamicLabel.label("Child"));
child.setProperty("name", "child" + i);
child.setProperty("count", i);
parent.createRelationshipTo(child, RelationshipTypes.PARENT_CHILD);
}
tx.success();
}
LOG.info(">>>> CREATED NODES");
final ExecutionEngine engine = new ExecutionEngine(graphDb, StringLogger.SYSTEM);
ExecutorService es = Executors.newFixedThreadPool(50);
final CountDownLatch cdl = new CountDownLatch(CHILDREN);
for (int i = 0; i < CHILDREN; i++) {
final int count = i;
es.execute(new Runnable() {
@Override
public void run() {
String cName = null;
boolean success = false;
try (Transaction tx = graphDb.beginTx()) {
while (!success) {
try {
Map<String, Object> params = new HashMap<String, Object>();
params.put("cCount", count);
ExecutionResult result = engine.execute(
"match (n:Parent)-[:PARENT_CHILD]->(m:Child) where m.count={cCount} return m.name", params);
for (Map<String, Object> row : result) {
cName = (String) row.get("m.name");
break;
}
success = true;
} catch (org.neo4j.graphdb.NotFoundException e) {
LOG.info(">>>> RETRY QUERY ON NotFoundException: " + count);
try {
Thread.sleep((long) Math.random() * 100);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
}
}
try (Transaction tx = graphDb.beginTx()) {
if (cName != null) {
tx.acquireWriteLock(parent);
Node child = findNode("Child", "name", cName, graphDb);
Relationship r = child.getSingleRelationship(RelationshipTypes.PARENT_CHILD, Direction.INCOMING);
r.delete();
child.delete();
LOG.info(">>>> DELETING NODES: " + cName);
}
tx.success();
} finally {
cdl.countDown();
}
}
});
}
cdl.await();
LOG.info(">>>> DELETED NODES");
es.shutdown();
}
private static void createIndex(String label, String propertyName, GraphDatabaseService graphDb) {
IndexDefinition indexDefinition;
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
indexDefinition = schema.indexFor(DynamicLabel.label(label)).on(propertyName).create();
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
schema.awaitIndexOnline(indexDefinition, 10, TimeUnit.SECONDS);
tx.success();
}
}
private static void registerShutdownHook(final GraphDatabaseService graphDb) {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
LOG.info("### GRAPHDB SHUTDOWNHOOK INVOKED !!!");
graphDb.shutdown();
}
});
}
private enum RelationshipTypes implements RelationshipType {
PARENT_CHILD
}
public static Node findNode(String labelName, String propertyName, Object propertyValue, GraphDatabaseService graphDb) {
if (propertyValue != null) {
Label label = DynamicLabel.label(labelName);
ResourceIterable<Node> ri = graphDb.findNodesByLabelAndProperty(label, propertyName, propertyValue);
if (ri != null) {
try {
ResourceIterator<Node> iter = ri.iterator();
try {
if (iter != null && iter.hasNext()) {
return iter.next();
}
} finally {
iter.close();
}
} catch (Exception e) {
LOG.error("ERROR WHILE FINDING ID: " + propertyValue + " , LABEL: " + labelName + " , PROPERTY: " + propertyName, e);
}
}
}
return null;
}
}
package net.ahm.graph;
导入java.io.File;
导入java.util.HashMap;
导入java.util.Map;
导入java.util.concurrent.CountDownLatch;
导入java.util.concurrent.ExecutorService;
导入java.util.concurrent.Executors;
导入java.util.concurrent.TimeUnit;
导入org.apache.log4j.Logger;
导入org.neo4j.cypher.javacompat.ExecutionEngine;
导入org.neo4j.cypher.javacompat.ExecutionResult;
导入org.neo4j.graphdb.Direction;
导入org.neo4j.graphdb.DynamicLabel;
导入org.neo4j.graphdb.GraphDatabaseService;
导入org.neo4j.graphdb.Label;
导入org.neo4j.graphdb.Node;
导入org.neo4j.graphdb.Relationship;
导入org.neo4j.graphdb.RelationshipType;
导入org.neo4j.graphdb.ResourceIterable;
导入org.neo4j.graphdb.ResourceIterator;
导入org.neo4j.graphdb.Transaction;
导入org.neo4j.graphdb.factory.GraphDatabaseFactory;
导入org.neo4j.graphdb.factory.GraphDatabaseSettings;
导入org.neo4j.graphdb.schema.IndexDefinition;
导入org.neo4j.graphdb.schema.schema;
导入org.neo4j.kernel.impl.util.FileUtils;
导入org.neo4j.kernel.impl.util.StringLogger;
公共类实验室{
私有静态最终整数子项=10000;
私有静态最终记录器LOG=Logger.getLogger(DeleteLab.class);
公共静态void main(字符串[]args)引发异常{
递归删除(新文件(“graphdb”);
final GraphDatabaseService graphDb=新GraphDatabaseFactory().newEmbeddedDatabaseBuilder(“graphDb”)
.setConfig(GraphDatabaseSettings.use_memory_mapped_buffers,“true”).setConfig(GraphDatabaseSettings.cache_type,“strong”)
.newGraphDatabase();
寄存器SHUTDownhook(graphDb);
LOG.info(“>>>>启动图形数据库”);
createIndex(“父项”、“名称”、graphDb);
createIndex(“子项”、“名称”和graphDb);
最终节点父节点;
try(事务tx=graphDb.beginTx()){
parent=graphDb.createNode(DynamicLabel.label(“parent”);
父项。setProperty(“名称”、“父项”);
成功();
}
try(事务tx=graphDb.beginTx()){
for(int i=0;i>>>创建的节点”);
final ExecutionEngine=新的ExecutionEngine(graphDb,StringLogger.SYSTEM);
Executors服务es=Executors.newFixedThreadPool(50);
最终倒计时锁存器cdl=新倒计时锁存器(子级);
for(int i=0;i(m:CHILD),其中m.count={cCount}返回m.name”,params);
用于(地图行:结果){
String cName=(String)row.get(“m.name”);
Node child=findNode(“child”、“name”、cName、graphDb);
关系r=child.getSingleRelationship(RelationshipTypes.PARENT\u child,Direction.INCOMING);
r、 删除();
child.delete();
}
成功();
}最后{
cdl.倒计时();
}
}
});
}
cdl.wait();
LOG.info(“>>>>已删除节点”);
es.shutdown();
}
私有静态void createIndex(字符串标签、字符串属性名称、GraphDatabaseService graphDb){
IndexDefinition IndexDefinition;
try(事务tx=graphDb.beginTx()){
Schema Schema=graphDb.Schema();
indexDefinition=schema.indexFor(DynamicLabel.label(label)).on(propertyName.create();
成功();
}
try(事务tx=graphDb.beginTx()){
Schema Schema=graphDb.Schema();
schema.awaitIndexOnline(indexDefinition,10,TimeUnit.SECONDS);
成功();
}
}
专用静态无效寄存器shutdownhook(最终图形DatabaseService graphDb){
Runtime.getRuntime().addShutdownHook(新线程(){
@凌驾
公开募捐{
LOG.info(“####调用了GRAPHDB关闭钩子!!!”;
graphDb.shutdown();
}
});
}
私有枚举RelationshipTypes实现RelationshipType{
父母子女
}
公共静态节点findNode(字符串labelName、字符串propertyName、对象propertyValue、GraphDatabaseService graphDb){
if(propertyValue!=null){
Label Label=DynamicLabel.Label(labelName);
ResourceIterable ri=graphDb.FindNodesByBeland属性(标签、属性名称、属性值);
如果(ri!=null){
试一试{
资源