InMemoryLedger.java
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package com.xly.service;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* 测试替身：内存版事件日志。append 与 Redis rightPush 同为「整条原子追加」，
* 用于验证投影逻辑与「任意并发写者只追加、绝无整包读改写」的设计性质。
*/
class InMemoryLedger extends LedgerService {
private final List<String> raw = Collections.synchronizedList(new ArrayList<>());
private final ObjectMapper mapper = new ObjectMapper();
InMemoryLedger() {
super(null, new ObjectMapper());
}
@Override
public void append(String convId, String type, Map<String, Object> data) {
Map<String, Object> ev = new LinkedHashMap<>();
ev.put("t", 0L);
ev.put("type", type);
if (data != null) {
ev.putAll(data);
}
try {
raw.add(mapper.writeValueAsString(ev));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public List<Map<String, Object>> events(String convId) {
return events(convId, 0);
}
@Override
public List<Map<String, Object>> events(String convId, int lastN) {
List<String> snapshot;
synchronized (raw) {
snapshot = new ArrayList<>(raw);
}
int from = lastN <= 0 ? 0 : Math.max(0, snapshot.size() - lastN);
List<Map<String, Object>> out = new ArrayList<>();
for (int i = from; i < snapshot.size(); i++) {
try {
@SuppressWarnings("unchecked")
Map<String, Object> m = mapper.readValue(snapshot.get(i), Map.class);
out.add(m);
} catch (Exception ignore) {
}
}
return out;
}
@Override
public boolean exists(String convId) {
return !raw.isEmpty();
}
@Override
public void delete(String convId) {
raw.clear();
}
int size() {
return raw.size();
}
}