wolfboys commented on code in PR #1866:
URL: 
https://github.com/apache/incubator-streampark/pull/1866#discussion_r1001347675


##########
streampark-console/streampark-console-service/src/main/java/org/apache/streampark/console/core/service/impl/VariableServiceImpl.java:
##########
@@ -79,4 +105,73 @@ public Variable findByVariableCode(Long teamId, String 
variableCode) {
     public List<Variable> findByTeamId(Long teamId) {
         return baseMapper.selectByTeamId(teamId);
     }
+
+    /**
+     * Replace placeholders with defined variable codes.
+     * @param teamId
+     * @param paramWithPlaceholders Parameters with placeholders, e.g. 
"--cluster ${kafka.cluster}"
+     * @return
+     */
+    @Override
+    public String replacePlaceholder(Long teamId, String 
paramWithPlaceholders) {
+        if (StringUtils.isEmpty(paramWithPlaceholders)) {
+            return paramWithPlaceholders;
+        }
+        String restore = paramWithPlaceholders;
+        Matcher matcher = placeholderPattern.matcher(paramWithPlaceholders);
+        while (matcher.find()) {
+            String placeholder = matcher.group();
+            String variableCode = getCodeFromPlaceholder(placeholder);
+            Variable variable = findByVariableCode(teamId, variableCode);
+            if (variable != null) {
+                restore = restore.replace(placeholder, 
variable.getVariableValue());
+            }
+        }
+        return restore;
+    }
+
+    private boolean isDependByApplications(Variable variable) {
+        // Detect whether the variable is dependent on the args of the 
application
+        List<Application> applications = 
applicationService.getByTeamId(variable.getTeamId());
+        if (applications != null) {
+            Iterator<Application> appIt = applications.iterator();
+            while (appIt.hasNext()) {
+                Application application = appIt.next();
+                if (isDepend(variable.getVariableCode(), 
application.getArgs())) {
+                    return true;
+                }
+            }
+        }
+
+        // Detect whether variables are dependent on all versions of flink sql
+        List<FlinkSql> sqls = 
flinkSqlService.getByTeamId(variable.getTeamId());
+        if (sqls != null) {
+            Iterator<FlinkSql> sqlIt = sqls.iterator();

Review Comment:
   code can be simplified too



##########
streampark-console/streampark-console-service/src/main/java/org/apache/streampark/console/core/service/impl/VariableServiceImpl.java:
##########
@@ -79,4 +105,73 @@ public Variable findByVariableCode(Long teamId, String 
variableCode) {
     public List<Variable> findByTeamId(Long teamId) {
         return baseMapper.selectByTeamId(teamId);
     }
+
+    /**
+     * Replace placeholders with defined variable codes.
+     * @param teamId
+     * @param paramWithPlaceholders Parameters with placeholders, e.g. 
"--cluster ${kafka.cluster}"
+     * @return
+     */
+    @Override
+    public String replacePlaceholder(Long teamId, String 
paramWithPlaceholders) {
+        if (StringUtils.isEmpty(paramWithPlaceholders)) {
+            return paramWithPlaceholders;
+        }
+        String restore = paramWithPlaceholders;
+        Matcher matcher = placeholderPattern.matcher(paramWithPlaceholders);
+        while (matcher.find()) {
+            String placeholder = matcher.group();
+            String variableCode = getCodeFromPlaceholder(placeholder);
+            Variable variable = findByVariableCode(teamId, variableCode);
+            if (variable != null) {
+                restore = restore.replace(placeholder, 
variable.getVariableValue());
+            }
+        }
+        return restore;
+    }
+
+    private boolean isDependByApplications(Variable variable) {
+        // Detect whether the variable is dependent on the args of the 
application
+        List<Application> applications = 
applicationService.getByTeamId(variable.getTeamId());
+        if (applications != null) {
+            Iterator<Application> appIt = applications.iterator();
+            while (appIt.hasNext()) {
+                Application application = appIt.next();
+                if (isDepend(variable.getVariableCode(), 
application.getArgs())) {
+                    return true;
+                }
+            }

Review Comment:
   code(line 137 ~ 143) can be simplified:
   ```
   for(Application app: applications) {
         if (isDepend(variable.getVariableCode(), app.getArgs())) {
             return true;
         }
     }
     ```



##########
streampark-console/streampark-console-service/src/main/java/org/apache/streampark/console/core/service/impl/VariableServiceImpl.java:
##########
@@ -17,48 +17,74 @@
 
 package org.apache.streampark.console.core.service.impl;
 
+import org.apache.streampark.common.util.DeflaterUtils;
 import org.apache.streampark.console.base.domain.RestRequest;
 import org.apache.streampark.console.base.exception.ApiAlertException;
 import org.apache.streampark.console.base.mybatis.pager.MybatisPager;
+import org.apache.streampark.console.core.entity.Application;
+import org.apache.streampark.console.core.entity.FlinkSql;
 import org.apache.streampark.console.core.entity.Variable;
 import org.apache.streampark.console.core.mapper.VariableMapper;
 import org.apache.streampark.console.core.service.ApplicationService;
 import org.apache.streampark.console.core.service.CommonService;
+import org.apache.streampark.console.core.service.FlinkSqlService;
 import org.apache.streampark.console.core.service.VariableService;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.Iterator;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 @Slf4j
 @Service
 @Transactional(propagation = Propagation.SUPPORTS, readOnly = true, 
rollbackFor = Exception.class)
 public class VariableServiceImpl extends ServiceImpl<VariableMapper, Variable> 
implements VariableService {
 
+    private final Pattern placeholderPattern = 
Pattern.compile("\\$\\{([A-Za-z])+([A-Za-z0-9._-])+\\}");
+
+    private final String placeholderLeft = "${";
+
+    private final String placeholderRight  = "}";

Review Comment:
   how about: placeholderEnd?



##########
streampark-console/streampark-console-service/src/main/java/org/apache/streampark/console/core/service/impl/VariableServiceImpl.java:
##########
@@ -17,48 +17,74 @@
 
 package org.apache.streampark.console.core.service.impl;
 
+import org.apache.streampark.common.util.DeflaterUtils;
 import org.apache.streampark.console.base.domain.RestRequest;
 import org.apache.streampark.console.base.exception.ApiAlertException;
 import org.apache.streampark.console.base.mybatis.pager.MybatisPager;
+import org.apache.streampark.console.core.entity.Application;
+import org.apache.streampark.console.core.entity.FlinkSql;
 import org.apache.streampark.console.core.entity.Variable;
 import org.apache.streampark.console.core.mapper.VariableMapper;
 import org.apache.streampark.console.core.service.ApplicationService;
 import org.apache.streampark.console.core.service.CommonService;
+import org.apache.streampark.console.core.service.FlinkSqlService;
 import org.apache.streampark.console.core.service.VariableService;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.Iterator;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 @Slf4j
 @Service
 @Transactional(propagation = Propagation.SUPPORTS, readOnly = true, 
rollbackFor = Exception.class)
 public class VariableServiceImpl extends ServiceImpl<VariableMapper, Variable> 
implements VariableService {
 
+    private final Pattern placeholderPattern = 
Pattern.compile("\\$\\{([A-Za-z])+([A-Za-z0-9._-])+\\}");
+
+    private final String placeholderLeft = "${";

Review Comment:
   how about: placeholderStart?



##########
streampark-console/streampark-console-service/src/main/java/org/apache/streampark/console/core/service/impl/VariableServiceImpl.java:
##########
@@ -79,4 +105,73 @@ public Variable findByVariableCode(Long teamId, String 
variableCode) {
     public List<Variable> findByTeamId(Long teamId) {
         return baseMapper.selectByTeamId(teamId);
     }
+
+    /**
+     * Replace placeholders with defined variable codes.
+     * @param teamId
+     * @param paramWithPlaceholders Parameters with placeholders, e.g. 
"--cluster ${kafka.cluster}"
+     * @return
+     */
+    @Override
+    public String replacePlaceholder(Long teamId, String 
paramWithPlaceholders) {

Review Comment:
   bad method name: `replacePlaceholder` , how about: `parseVariable` or 
`parse` ?



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