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new da856a4619 [INLONG-9928][Audit] Audit-service HA election through
mysql (#9929)
da856a4619 is described below
commit da856a4619098c3cce86f2d0330826f20935c2ec
Author: doleyzi <[email protected]>
AuthorDate: Mon Apr 8 14:06:04 2024 +0800
[INLONG-9928][Audit] Audit-service HA election through mysql (#9929)
---
.../src/main/java/config/ConfigConstants.java | 13 +
.../src/main/java/config/SqlConstants.java | 37 +++
...elector.java => ElectorChangeListenerImpl.java} | 30 +--
.../src/main/java/elector/api/Selector.java | 2 +-
.../api/{Selector.java => SelectorFactory.java} | 28 +-
.../src/main/java/elector/impl/DBDataSource.java | 298 +++++++++++++++++++++
.../src/main/java/elector/impl/SelectorImpl.java | 210 +++++++++++++++
7 files changed, 578 insertions(+), 40 deletions(-)
diff --git
a/inlong-audit/audit-service/src/main/java/config/ConfigConstants.java
b/inlong-audit/audit-service/src/main/java/config/ConfigConstants.java
index a3bd9b29f9..42ef2d7046 100644
--- a/inlong-audit/audit-service/src/main/java/config/ConfigConstants.java
+++ b/inlong-audit/audit-service/src/main/java/config/ConfigConstants.java
@@ -101,4 +101,17 @@ public class ConfigConstants {
public static final String KEY_DAILY_SUMMARY_BEFORE_TIMES =
"daily.summary.before.times";
public static final int DEFAULT_DAILY_SUMMARY_BEFORE_TIMES = 2;
+ // HA selector config
+ public static final String KEY_RELEASE_LEADER_INTERVAL =
"release.leader.interval";
+ public static final int DEFAULT_RELEASE_LEADER_INTERVAL = 40;
+ public static final String KEY_SELECTOR_THREAD_POOL_SIZE =
"selector.thread.pool.size";
+ public static final int DEFAULT_SELECTOR_THREAD_POOL_SIZE = 3;
+
+ // HikariConfig
+ public static final String CACHE_PREP_STMTS = "cachePrepStmts";
+ public static final String PREP_STMT_CACHE_SIZE = "prepStmtCacheSize";
+ public static final String PREP_STMT_CACHE_SQL_LIMIT =
"prepStmtCacheSqlLimit";
+
+ public static final int MAX_INIT_COUNT = 2;
+ public static final int RANDOM_BOUND = 10;
}
diff --git a/inlong-audit/audit-service/src/main/java/config/SqlConstants.java
b/inlong-audit/audit-service/src/main/java/config/SqlConstants.java
new file mode 100644
index 0000000000..a7164f2bdf
--- /dev/null
+++ b/inlong-audit/audit-service/src/main/java/config/SqlConstants.java
@@ -0,0 +1,37 @@
+/*
+ * 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 config;
+
+/**
+ * Sql constants
+ */
+public class SqlConstants {
+
+ // HA selector sql
+ public static final String SELECTOR_SQL =
+ "insert ignore into {0} (service_id, leader_id, last_seen_active)
values (''{1}'', ''{2}'', now()) on duplicate key update leader_id =
if(last_seen_active < now() - interval # second, values(leader_id),
leader_id),last_seen_active = if(leader_id = values(leader_id),
values(last_seen_active), last_seen_active)";
+ public static final String REPLACE_LEADER_SQL =
+ "replace into {0} ( service_id, leader_id, last_seen_active )
values (''{1}'', ''#'', now())";
+ public static final String RELEASE_SQL = "delete from {0} where
service_id=''{1}'' and leader_id= ''{2}''";
+ public static final String IS_LEADER_SQL =
+ "select count(*) as is_leader from {0} where service_id=''{1}''
and leader_id=''{2}''";
+ public static final String SEARCH_CURRENT_LEADER_SQL =
+ "select leader_id as leader from {0} where service_id=''{1}''";
+ public static final String SELECT_TEST_SQL = "SELECT 1 ";
+
+}
diff --git a/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
b/inlong-audit/audit-service/src/main/java/elector/ElectorChangeListenerImpl.java
similarity index 60%
copy from inlong-audit/audit-service/src/main/java/elector/api/Selector.java
copy to
inlong-audit/audit-service/src/main/java/elector/ElectorChangeListenerImpl.java
index d4aa342dea..9017caacff 100644
--- a/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
+++
b/inlong-audit/audit-service/src/main/java/elector/ElectorChangeListenerImpl.java
@@ -15,28 +15,20 @@
* limitations under the License.
*/
-package elector.api;
+package elector;
+
+import elector.api.SelectorChangeListener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
/**
- * Selector
+ * Elector change listener impl
*/
-public abstract class Selector {
-
- protected boolean isLeader;
-
- public abstract void init() throws Exception;
-
- public abstract boolean isLeader();
-
- public abstract void releaseLeader() throws Exception;
-
- public abstract void replaceLeader(String newLeaderId) throws Exception;
-
- public abstract String getLeader(String serviceId);
-
- public abstract void canSelect(boolean canSelect);
+public class ElectorChangeListenerImpl implements SelectorChangeListener {
- public abstract boolean rebuildSelectorDBSource();
+ private static final Logger logger =
LoggerFactory.getLogger(ElectorChangeListenerImpl.class);
- public abstract boolean close();
+ public void leaderChanged(boolean currentNodeIsLeader) {
+ logger.info("LeaderChanged {}:", currentNodeIsLeader);
+ }
}
diff --git a/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
b/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
index d4aa342dea..5e9e564762 100644
--- a/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
+++ b/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
@@ -38,5 +38,5 @@ public abstract class Selector {
public abstract boolean rebuildSelectorDBSource();
- public abstract boolean close();
+ public abstract void close();
}
diff --git a/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
b/inlong-audit/audit-service/src/main/java/elector/api/SelectorFactory.java
similarity index 61%
copy from inlong-audit/audit-service/src/main/java/elector/api/Selector.java
copy to
inlong-audit/audit-service/src/main/java/elector/api/SelectorFactory.java
index d4aa342dea..42ed31a724 100644
--- a/inlong-audit/audit-service/src/main/java/elector/api/Selector.java
+++ b/inlong-audit/audit-service/src/main/java/elector/api/SelectorFactory.java
@@ -17,26 +17,14 @@
package elector.api;
+import elector.impl.SelectorImpl;
+
/**
- * Selector
+ * Selector factory
*/
-public abstract class Selector {
-
- protected boolean isLeader;
-
- public abstract void init() throws Exception;
-
- public abstract boolean isLeader();
-
- public abstract void releaseLeader() throws Exception;
-
- public abstract void replaceLeader(String newLeaderId) throws Exception;
-
- public abstract String getLeader(String serviceId);
-
- public abstract void canSelect(boolean canSelect);
-
- public abstract boolean rebuildSelectorDBSource();
+public class SelectorFactory {
- public abstract boolean close();
-}
+ public static Selector getNewElector(SelectorConfig electorConfig) {
+ return new SelectorImpl(electorConfig);
+ }
+}
\ No newline at end of file
diff --git
a/inlong-audit/audit-service/src/main/java/elector/impl/DBDataSource.java
b/inlong-audit/audit-service/src/main/java/elector/impl/DBDataSource.java
new file mode 100644
index 0000000000..91eef3156f
--- /dev/null
+++ b/inlong-audit/audit-service/src/main/java/elector/impl/DBDataSource.java
@@ -0,0 +1,298 @@
+/*
+ * 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 elector.impl;
+
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+import elector.api.SelectorConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.text.MessageFormat;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static config.ConfigConstants.CACHE_PREP_STMTS;
+import static config.ConfigConstants.MAX_INIT_COUNT;
+import static config.ConfigConstants.PREP_STMT_CACHE_SIZE;
+import static config.ConfigConstants.PREP_STMT_CACHE_SQL_LIMIT;
+import static config.SqlConstants.IS_LEADER_SQL;
+import static config.SqlConstants.RELEASE_SQL;
+import static config.SqlConstants.REPLACE_LEADER_SQL;
+import static config.SqlConstants.SEARCH_CURRENT_LEADER_SQL;
+import static config.SqlConstants.SELECTOR_SQL;
+import static config.SqlConstants.SELECT_TEST_SQL;
+
+/**
+ * DB data source
+ */
+public class DBDataSource {
+
+ private static final Logger logger =
LoggerFactory.getLogger(DBDataSource.class);
+ private String selectorSql = SELECTOR_SQL;
+ private String replaceLeaderSql = REPLACE_LEADER_SQL;
+ private String reLeaseSql = RELEASE_SQL;
+ private String isLeaderSql = IS_LEADER_SQL;
+ private String searchCurrentLeaderSql = SEARCH_CURRENT_LEADER_SQL;
+ private final SelectorConfig selectorConfig;
+ private HikariDataSource datasource;
+ public AtomicInteger getConnectionFailTimes;
+
+ public DBDataSource(SelectorConfig selectorConfig) {
+ this.selectorConfig = selectorConfig;
+ this.getConnectionFailTimes = new AtomicInteger(0);
+ }
+
+ /**
+ * init
+ *
+ * @param needFormatSql
+ * @throws Exception
+ */
+ public void init(boolean needFormatSql) throws Exception {
+ try {
+ if (!selectorConfig.isUseDefaultLeader()) {
+ initDataSource();
+ if (needFormatSql) {
+ formatSql(selectorConfig.getElectorDbName(),
selectorConfig.getServiceId(),
+ selectorConfig.getLeaderId());
+ }
+ }
+ } catch (Exception exception) {
+ logger.error(exception.getMessage());
+ throw exception;
+ }
+ }
+
+ /**
+ * init data source
+ *
+ * @throws Exception
+ */
+ public void initDataSource() throws Exception {
+ boolean initSucc = false;
+ int initCount = 0;
+
+ while (!initSucc && initCount < MAX_INIT_COUNT) {
+ try {
+ ++initCount;
+ if (datasource == null || datasource.isClosed()) {
+ HikariConfig config = new HikariConfig();
+ config.setDriverClassName(selectorConfig.getDbDriver());
+ logger.info("Init dataSource:{}",
selectorConfig.getDbUrl());
+ config.setJdbcUrl(selectorConfig.getDbUrl());
+ config.setUsername(selectorConfig.getDbUser());
+ config.setPassword(selectorConfig.getDbPasswd());
+
config.setMaximumPoolSize(selectorConfig.getMaximumPoolSize());
+ config.setAutoCommit(true);
+ config.setConnectionTimeout((long)
selectorConfig.getConnectionTimeout());
+ config.setMaxLifetime((long)
selectorConfig.getMaxLifetime());
+ config.addDataSourceProperty(CACHE_PREP_STMTS,
selectorConfig.getCachePrepStmts());
+ config.addDataSourceProperty(PREP_STMT_CACHE_SIZE,
selectorConfig.getPrepStmtCacheSize());
+ config.addDataSourceProperty(PREP_STMT_CACHE_SQL_LIMIT,
+ selectorConfig.getPrepStmtCacheSqlLimit());
+ config.setConnectionTestQuery(SELECT_TEST_SQL);
+ datasource = new HikariDataSource(config);
+ }
+
+ initSucc = true;
+ } catch (Exception exception) {
+ logger.error("DB url:{},user name:{},password:{},exception:{}",
+ selectorConfig.getDbUrl(),
+ selectorConfig.getDbUser(),
+ selectorConfig.getDbPasswd(),
+ exception.getMessage());
+ }
+ }
+
+ if (!initSucc) {
+ throw new Exception("## DBDataSource init Fail！");
+ }
+ }
+
+ /**
+ * close
+ */
+ public void close() {
+ datasource.close();
+ }
+
+ /**
+ * Execute update
+ *
+ * @param sql
+ * @return
+ */
+ private int executeUpdate(String sql) {
+ int result = 0;
+ try {
+ if ((null == datasource) || (datasource.isClosed())) {
+ initDataSource();
+ }
+
+ try (Connection connection = datasource.getConnection()) {
+ try (PreparedStatement pstmt =
connection.prepareStatement(sql)) {
+ result = pstmt.executeUpdate();
+ } catch (Exception executeUpdatEexception) {
+ logger.error("Exception :{}",
executeUpdatEexception.getMessage());
+ }
+ } catch (Exception pstmtEexception) {
+ logger.error("Exception :{}", pstmtEexception.getMessage());
+ }
+ getConnectionFailTimes.set(0);
+ } catch (Exception exception) {
+ getConnectionFailTimes.addAndGet(1);
+ logger.warn("Get Connection fail. {}", exception.getMessage());
+ }
+ return result;
+ }
+
+ /**
+ * Leader selector
+ */
+ public void leaderSelector() {
+ if (!selectorConfig.isUseDefaultLeader()) {
+ try {
+ int result = executeUpdate(selectorSql);
+ if (result == 2) {
+ logger.info("{} get the leader",
selectorConfig.getLeaderId());
+ } else if (result == 1) {
+ logger.info("{} do not get the leader",
selectorConfig.getLeaderId());
+ }
+ } catch (Exception exception) {
+ logger.error("Exception: {} ,sql:{}", exception.getMessage(),
selectorSql);
+ }
+
+ }
+ }
+
+ /**
+ * Replace leader
+ *
+ * @param replaceLeaderId
+ */
+ public void replaceLeader(String replaceLeaderId) {
+ replaceLeaderSql = replaceLeaderSql.replaceAll("#", replaceLeaderId);
+
+ try {
+ int result = executeUpdate(replaceLeaderSql);
+ if (result > 0) {
+ logger.info("Replace leader success.sql:{}", replaceLeaderSql);
+ } else {
+ logger.warn("Replace leader failed. sql:" + replaceLeaderSql);
+ }
+
+ } catch (Exception exception) {
+ logger.error("Exception :{} ", exception.getMessage());
+ }
+ }
+
+ /**
+ * Release leader
+ */
+ public void releaseLeader() {
+ try {
+ int result = executeUpdate(reLeaseSql);
+ logger.info("ReleaseLeader sql:{}", reLeaseSql);
+ if (result == 1) {
+ logger.info("{} release the leader success",
selectorConfig.getLeaderId());
+ }
+ } catch (Exception exception) {
+ logger.error("ReLease sql:{},exception {}:,", reLeaseSql,
exception.getMessage());
+ }
+
+ }
+
+ /**
+ * Get current leader
+ *
+ * @return
+ */
+ public String getCurrentLeader() {
+ if (selectorConfig.isUseDefaultLeader()) {
+ return selectorConfig.getDefaultLeaderId();
+ } else {
+ String leaderId = "";
+
+ try {
+ if (null == datasource || datasource.isClosed()) {
+ logger.warn("DataSource is closed init is again");
+ initDataSource();
+ }
+ try (Connection connection = datasource.getConnection()) {
+ try (PreparedStatement pstmt =
connection.prepareStatement(searchCurrentLeaderSql)) {
+ ResultSet resultSet = pstmt.executeQuery();
+ if (resultSet.next()) {
+ leaderId = resultSet.getString("leader");
+ }
+ } catch (Exception exception) {
+ logger.error("Exception {}", exception.getMessage());
+ }
+ } catch (Throwable connectionException) {
+ logger.error("Exception {}",
connectionException.getMessage());
+ }
+ } catch (Exception datasourceException) {
+ logger.error("Exception {}", datasourceException.getMessage());
+ }
+
+ return leaderId;
+ }
+ }
+
+ /**
+ * Judge DB data source whether to closed
+ *
+ * @return
+ */
+ public boolean isDBDataSourceClosed() {
+ if (this.datasource != null) {
+ try {
+ Connection con = datasource.getConnection();
+ if (con != null) {
+ con.close();
+ }
+ return false;
+ } catch (Exception exception) {
+ logger.error("Exception {}", exception.getMessage());
+ return true;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Format sql
+ *
+ * @param params
+ */
+ public void formatSql(String... params) {
+ selectorSql = MessageFormat.format(selectorSql, params);
+ selectorSql = selectorSql.replaceAll("#",
selectorConfig.getLeaderTimeout() + "");
+ logger.info(selectorSql);
+ replaceLeaderSql = MessageFormat.format(replaceLeaderSql, params);
+ logger.info(replaceLeaderSql);
+ reLeaseSql = MessageFormat.format(reLeaseSql, params);
+ logger.info("ReLeaseSql:{}", reLeaseSql);
+ isLeaderSql = MessageFormat.format(isLeaderSql, params);
+ logger.info(isLeaderSql);
+ searchCurrentLeaderSql = MessageFormat.format(searchCurrentLeaderSql,
params);
+ logger.info(searchCurrentLeaderSql);
+ }
+}
diff --git
a/inlong-audit/audit-service/src/main/java/elector/impl/SelectorImpl.java
b/inlong-audit/audit-service/src/main/java/elector/impl/SelectorImpl.java
new file mode 100644
index 0000000000..b84051fccb
--- /dev/null
+++ b/inlong-audit/audit-service/src/main/java/elector/impl/SelectorImpl.java
@@ -0,0 +1,210 @@
+/*
+ * 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 elector.impl;
+
+import config.Configuration;
+import elector.api.Selector;
+import elector.api.SelectorConfig;
+import elector.task.DBMonitorTask;
+import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Random;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+import static config.ConfigConstants.DEFAULT_RELEASE_LEADER_INTERVAL;
+import static config.ConfigConstants.DEFAULT_SELECTOR_THREAD_POOL_SIZE;
+import static config.ConfigConstants.KEY_RELEASE_LEADER_INTERVAL;
+import static config.ConfigConstants.KEY_SELECTOR_THREAD_POOL_SIZE;
+import static config.ConfigConstants.RANDOM_BOUND;
+
+/**
+ * Elector Impl
+ */
+public class SelectorImpl extends Selector {
+
+ private static final Logger logger =
LoggerFactory.getLogger(SelectorImpl.class);
+ private final SelectorConfig selectorConfig;
+ private final ExecutorService fixedThreadPool;
+ private boolean canElector = true;
+ private final DBDataSource dbDataSource;
+ private long sleepTime = 0L;
+ private boolean running = true;
+
+ public SelectorImpl(SelectorConfig selectorConfig) {
+ this.selectorConfig = selectorConfig;
+ this.dbDataSource = new DBDataSource(selectorConfig);
+ fixedThreadPool =
Executors.newFixedThreadPool(Configuration.getInstance().get(
+ KEY_SELECTOR_THREAD_POOL_SIZE,
+ DEFAULT_SELECTOR_THREAD_POOL_SIZE));
+ }
+
+ /**
+ * init
+ *
+ * @throws Exception
+ */
+ public void init() throws Exception {
+ try {
+ logger.info("Init selector impl...");
+
+ dbDataSource.init(true);
+
+ fixedThreadPool.execute(new ElectorWorkerThread());
+
+ fixedThreadPool.execute(new DBMonitorTask(selectorConfig,
dbDataSource));
+ } catch (Exception exception) {
+ logger.error("Failed to init selector", exception);
+ }
+ }
+
+ /**
+ * Judge where is leader
+ *
+ * @return
+ */
+ public boolean isLeader() {
+ return this.isLeader;
+ }
+
+ /**
+ * Release leader
+ */
+ public void releaseLeader() {
+ if (this.isLeader)
+ try {
+ dbDataSource.releaseLeader();
+ } catch (Exception exception) {
+ logger.error("Exception :{}", exception.getMessage());
+ }
+
+ try {
+
TimeUnit.SECONDS.sleep(Configuration.getInstance().get(KEY_RELEASE_LEADER_INTERVAL,
+ DEFAULT_RELEASE_LEADER_INTERVAL));
+ } catch (Exception exception) {
+ logger.error("Exception :{}", exception.getMessage());
+ }
+ }
+
+ /**
+ * Replace leader
+ *
+ * @param newLeaderId
+ */
+ public void replaceLeader(String newLeaderId) {
+ sleepTime = (selectorConfig.getTryToBeLeaderInterval() * 2L);
+ dbDataSource.replaceLeader(newLeaderId);
+ }
+
+ /**
+ * Get leader
+ *
+ * @param serviceId
+ * @return
+ */
+ public String getLeader(String serviceId) {
+ return dbDataSource.getCurrentLeader();
+ }
+
+ /**
+ * Judge where can be elector
+ *
+ * @param canElector
+ */
+ public void canSelect(boolean canElector) {
+ this.canElector = canElector;
+ }
+
+ /**
+ * Rebuild elector DBSource
+ *
+ * @return
+ */
+ public boolean rebuildSelectorDBSource() {
+ canSelect(false);
+ try {
+ releaseLeader();
+ dbDataSource.close();
+ dbDataSource.init(false);
+ canSelect(true);
+ } catch (Exception exception) {
+ logger.error("Exception :{}", exception.getMessage());
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * close
+ *
+ * @return
+ */
+ public void close() {
+ running = false;
+ dbDataSource.close();
+ fixedThreadPool.shutdown();
+ }
+
+ class ElectorWorkerThread implements Runnable {
+
+ Random random;
+
+ ElectorWorkerThread() {
+ this.random = new Random();
+ }
+
+ public void run() {
+ while (running) {
+ if (canElector) {
+ dbDataSource.leaderSelector();
+ }
+
+ String leaderId = dbDataSource.getCurrentLeader();
+ if (StringUtils.isNotEmpty(leaderId)) {
+ if (selectorConfig.getLeaderId().equals(leaderId)) {
+ if (!isLeader
+ && selectorConfig.getSelectorChangeListener()
!= null) {
+
selectorConfig.getSelectorChangeListener().leaderChanged(true);
+ }
+
+ isLeader = true;
+ sleepTime = selectorConfig.getTryToBeLeaderInterval();
+ } else {
+ if (isLeader
+ && selectorConfig.getSelectorChangeListener()
!= null) {
+
selectorConfig.getSelectorChangeListener().leaderChanged(false);
+ }
+
+ isLeader = false;
+ sleepTime = selectorConfig.getTryToBeLeaderInterval()
+ + random.nextInt(RANDOM_BOUND);
+ }
+ }
+
+ try {
+ TimeUnit.SECONDS.sleep(sleepTime);
+ } catch (Exception exception) {
+ logger.error("Exception :{}", exception.getMessage());
+ }
+ }
+ }
+ }
+}
\ No newline at end of file
