enhancement #I9FM3I chain 中增加一个指纹值

liteflow-core/src/main/java/com/yomahub/liteflow/builder/el/LiteFlowChainELBuilder.java

@@ -183,6 +183,15 @@ public class LiteFlowChainELBuilder {
 		}
 
 		this.chain.setEl(elStr);
+
+		// 判断是否已经包含了这个EL
+		if (this.chain.isExist()) {
+			if (LOG.isDebugEnabled()) {
+				LOG.debug("chain[{}] el[{}] is already contains, skip", chain.getChainId(), elStr);
+			}
+			return this;
+		}
+
 		LiteflowConfig liteflowConfig = LiteflowConfigGetter.get();
 		// 如果设置了不检查Node是否存在，那么这里是不解析的
 		if (liteflowConfig.getParseMode().equals(ParseModeEnum.PARSE_ONE_ON_FIRST_EXEC)){
@@ -256,6 +265,17 @@ public class LiteFlowChainELBuilder {
 	}
 
 	public void build() {
+
+		// 如果不用是新的chain，不需要更新
+		if (chain.isExist()) {
+			return;
+		} else {
+			// 如果是新的chain，需要更新
+			if (StrUtil.isNotBlank(chain.getEl())){
+				chain.setChainSha256();
+			}
+		}
+
 		this.chain.setRouteItem(this.route);
 		this.chain.setConditionList(this.conditionList);
 

liteflow-core/src/main/java/com/yomahub/liteflow/flow/element/Chain.java

@@ -10,16 +10,22 @@ package com.yomahub.liteflow.flow.element;
 
 import cn.hutool.core.collection.CollUtil;
 import cn.hutool.core.util.BooleanUtil;
+import cn.hutool.core.util.StrUtil;
 import com.yomahub.liteflow.builder.el.LiteFlowChainELBuilder;
 import com.yomahub.liteflow.exception.ChainEndException;
+import com.yomahub.liteflow.flow.FlowBus;
 import com.yomahub.liteflow.log.LFLog;
 import com.yomahub.liteflow.log.LFLoggerManager;
 import com.yomahub.liteflow.slot.DataBus;
 import com.yomahub.liteflow.slot.Slot;
 import com.yomahub.liteflow.enums.ExecuteableTypeEnum;
 import com.yomahub.liteflow.exception.FlowSystemException;
+import com.yomahub.liteflow.util.Sha256Util;
+
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
 
 /**
  * chain对象，实现可执行器
@@ -32,6 +38,8 @@ public class Chain implements Executable{
 
     private String chainId;
 
+    private String chainSha256;
+
     private Executable routeItem;
 
     private List<Condition> conditionList = new ArrayList<>();
@@ -105,18 +113,15 @@ public class Chain implements Executable{
                 condition.setCurrChainId(chainId);
                 condition.execute(slotIndex);
             }
-		}
-		catch (ChainEndException e) {
+        } catch (ChainEndException e) {
             // 这里单独catch ChainEndException是因为ChainEndException是用户自己setIsEnd抛出的异常
             // 是属于正常逻辑，所以会在FlowExecutor中判断。这里不作为异常处理
             throw e;
-		}
-		catch (Exception e) {
+        } catch (Exception e) {
             // 这里事先取到exception set到slot里，为了方便finally取到exception
             if (slot.isSubChain(chainId)) {
                 slot.setSubException(chainId, e);
-			}
-			else {
+            } else {
                 slot.setException(e);
             }
             throw e;
@@ -139,11 +144,9 @@ public class Chain implements Executable{
             boolean routeResult = routeItem.getItemResultMetaValue(slotIndex);
 
             slot.setRouteResult(routeResult);
-		}
-		catch (ChainEndException e) {
+        } catch (ChainEndException e) {
             throw e;
-		}
-		catch (Exception e) {
+        } catch (Exception e) {
             slot.setException(e);
             throw e;
         }
@@ -205,4 +208,30 @@ public class Chain implements Executable{
     public void setNamespace(String namespace) {
         this.namespace = namespace;
     }
+
+    public String getChainSha256() {
+        return chainSha256;
+    }
+
+    public void setChainSha256() {
+        String ns = Optional.ofNullable(this.namespace).orElse("");
+        this.chainSha256 = Sha256Util.sha256(chainId + ns + el);
+    }
+
+    public boolean isExist() {
+        if (StrUtil.isBlank(chainId) || StrUtil.isBlank(el)) {
+            return false;
+        }
+
+        String ns = Optional.ofNullable(this.namespace).orElse("");
+        String elSha256 = Sha256Util.sha256(chainId + ns + el);
+        for (Chain chainElement : FlowBus.getChainMap().values()) {
+            String chainSha256Exist = chainElement.getChainSha256();
+            if (Objects.equals(chainSha256Exist, elSha256)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }

liteflow-core/src/main/java/com/yomahub/liteflow/util/Sha256Util.java

@@ -0,0 +1,33 @@
+package com.yomahub.liteflow.util;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * sha 256 工具类
+ *
+ * @author gaibu
+ * @since 2.12.1
+ */
+public class Sha256Util {
+    public static String sha256(String input) {
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            byte[] hash = digest.digest(input.getBytes());
+
+            // Convert byte array to hexadecimal string
+            StringBuilder hexString = new StringBuilder();
+            for (byte b : hash) {
+                String hex = Integer.toHexString(0xff & b);
+                if (hex.length() == 1) {
+                    hexString.append('0');
+                }
+                hexString.append(hex);
+            }
+            return hexString.toString();
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}

liteflow-testcase-el/liteflow-testcase-el-nospring/src/test/java/com/yomahub/liteflow/test/builder/BuilderTest.java

@@ -6,7 +6,9 @@ import com.yomahub.liteflow.core.FlowExecutor;
 import com.yomahub.liteflow.core.FlowExecutorHolder;
 import com.yomahub.liteflow.enums.NodeTypeEnum;
 import com.yomahub.liteflow.exception.ELParseException;
+import com.yomahub.liteflow.flow.FlowBus;
 import com.yomahub.liteflow.flow.LiteflowResponse;
+import com.yomahub.liteflow.flow.element.Chain;
 import com.yomahub.liteflow.property.LiteflowConfig;
 import com.yomahub.liteflow.test.BaseTest;
 import com.yomahub.liteflow.test.builder.cmp.*;
@@ -175,4 +177,45 @@ public class BuilderTest extends BaseTest {
 		Assertions.assertEquals("a1[组件A1]==>c2[组件C2]==>a2[组件A2]==>c1[组件C1]", response.getExecuteStepStr());
 	}
 
+	// 测试 EL 表达式的覆盖
+	@Test
+	public void testBuilderElOver() throws Exception {
+		LiteFlowNodeBuilder.createNode()
+				.setId("a1")
+				.setName("组件A1")
+				.setType(NodeTypeEnum.COMMON)
+				.setClazz(ACmp.class)
+				.build();
+		LiteFlowNodeBuilder.createNode()
+				.setId("a2")
+				.setName("组件A2")
+				.setType(NodeTypeEnum.COMMON)
+				.setClazz(ACmp.class)
+				.build();
+		LiteFlowNodeBuilder.createNode()
+				.setId("c1")
+				.setName("组件C1")
+				.setType(NodeTypeEnum.COMMON)
+				.setClazz(CCmp.class)
+				.build();
+		LiteFlowNodeBuilder.createNode()
+				.setId("c2")
+				.setName("组件C2")
+				.setType(NodeTypeEnum.COMMON)
+				.setClazz(CCmp.class)
+				.build();
+		LiteFlowChainELBuilder.createChain().setChainName("chain1").setEL("THEN(a1,c2,a2,c1)").build();
+		String sha256 = FlowBus.getChainMap().get("chain1").getChainSha256();
+
+		LiteFlowChainELBuilder.createChain().setChainId("chain1").setEL("THEN(a1,c2,a2,c1)").build();
+		String sha256Same = FlowBus.getChainMap().get("chain1").getChainSha256();
+
+        Assertions.assertEquals(sha256, sha256Same);
+
+		LiteFlowChainELBuilder.createChain().setChainId("chain1").setEL("THEN(a1,c2,a2)").build();
+		String chain1Sha256 = FlowBus.getChainMap().get("chain1").getChainSha256();
+
+		Assertions.assertNotEquals(sha256, chain1Sha256);
+	}
+
 }