enhancement: #I1W8OW 提一个需求点：一个组件出错能记录一些重要信息

liteflow-core/src/main/java/com/yomahub/liteflow/core/FlowExecutor.java

@@ -99,58 +99,57 @@ public class FlowExecutor {
 
 	public <T extends Slot> T execute(String chainId,Object param,Class<? extends Slot> slotClazz,Integer slotIndex,boolean isInnerChain) throws Exception{
 		Slot slot = null;
-		try{
-			if(FlowBus.needInit()) {
-				init();
-			}
 
-			Chain chain = FlowBus.getChain(chainId);
+		if(FlowBus.needInit()) {
+			init();
+		}
 
-			if(chain == null){
-				String errorMsg = MessageFormat.format("couldn't find chain with the id[{0}]", chainId);
-				throw new ChainNotFoundException(errorMsg);
-			}
+		Chain chain = FlowBus.getChain(chainId);
 
-			if(!isInnerChain && slotIndex == null) {
-				slotIndex = DataBus.offerSlot(slotClazz);
-				LOG.info("slot[{}] offered",slotIndex);
-			}
+		if(chain == null){
+			String errorMsg = MessageFormat.format("couldn't find chain with the id[{0}]", chainId);
+			throw new ChainNotFoundException(errorMsg);
+		}
 
-			if(slotIndex == -1){
-				throw new NoAvailableSlotException("there is no available slot");
-			}
+		if(!isInnerChain && slotIndex == null) {
+			slotIndex = DataBus.offerSlot(slotClazz);
+			LOG.info("slot[{}] offered",slotIndex);
+		}
 
-			slot = DataBus.getSlot(slotIndex);
-			if(slot == null) {
-				throw new NoAvailableSlotException("the slot is not exist");
-			}
+		if(slotIndex == -1){
+			throw new NoAvailableSlotException("there is no available slot");
+		}
 
-			if(StringUtils.isBlank(slot.getRequestId())) {
-				slot.generateRequestId();
-				LOG.info("requestId[{}] has generated",slot.getRequestId());
-			}
+		slot = DataBus.getSlot(slotIndex);
+		if(slot == null) {
+			throw new NoAvailableSlotException("the slot is not exist");
+		}
 
-			if(!isInnerChain) {
-				slot.setRequestData(param);
-				slot.setChainName(chainId);
-			}else {
-				slot.setChainReqData(chainId, param);
-			}
+		if(StringUtils.isBlank(slot.getRequestId())) {
+			slot.generateRequestId();
+			LOG.info("requestId[{}] has generated",slot.getRequestId());
+		}
+
+		if(!isInnerChain) {
+			slot.setRequestData(param);
+			slot.setChainName(chainId);
+		}else {
+			slot.setChainReqData(chainId, param);
+		}
 
+		try {
 			//执行chain
 			chain.execute(slotIndex);
-
-			return (T)slot;
 		}catch(Exception e){
-			String errorMsg = MessageFormat.format("[{0}]executor cause error", slot.getRequestId());
-			LOG.error(errorMsg,e);
-			throw e;
+			slot.setSuccess(false);
+			slot.setErrorMsg(e.getMessage());
 		}finally{
 			if(!isInnerChain) {
 				slot.printStep();
 				DataBus.releaseSlot(slotIndex);
 			}
 		}
+		return (T)slot;
 	}
 
 	private class WhenConditionThread extends Thread{