OHLC pipeline stuff

src/main/java/stream/dto/OHLCCandle.java

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+package stream.dto;
+
+import java.math.BigDecimal;
+
+public class OHLCCandle {
+    private final String pool;
+    private final String token0;
+    private final String token1;
+    private final long windowStart;
+    private final long windowEnd;
+    private final BigDecimal open;
+    private final BigDecimal high;
+    private final BigDecimal low;
+    private final BigDecimal close;
+    private final BigDecimal volume;
+    private final int tradeCount;
+
+    public OHLCCandle(String pool, String token0, String token1,
+                      long windowStart, long windowEnd, 
+                      BigDecimal open, BigDecimal high, BigDecimal low, BigDecimal close,
+                      BigDecimal volume, int tradeCount) {
+        this.pool = pool;
+        this.token0 = token0;
+        this.token1 = token1;
+        this.windowStart = windowStart;
+        this.windowEnd = windowEnd;
+        this.open = open;
+        this.high = high;
+        this.low = low;
+        this.close = close;
+        this.volume = volume;
+        this.tradeCount = tradeCount;
+    }
+
+    // Getters
+    public String getPool() { return pool; }
+    public String getToken0() { return token0; }
+    public String getToken1() { return token1; }
+    public long getWindowStart() { return windowStart; }
+    public long getWindowEnd() { return windowEnd; }
+    public BigDecimal getOpen() { return open; }
+    public BigDecimal getHigh() { return high; }
+    public BigDecimal getLow() { return low; }
+    public BigDecimal getClose() { return close; }
+    public BigDecimal getVolume() { return volume; }
+    public int getTradeCount() { return tradeCount; }
+    
+    @Override
+    public String toString() {
+        return String.format("OHLC[%s] %s/%s %d-%d: O=%.4f H=%.4f L=%.4f C=%.4f V=%.4f Trades=%d",
+            pool.substring(0, 8) + "...", 
+            token0.substring(0, 6), token1.substring(0, 6),
+            windowStart, windowEnd,
+            open, high, low, close, volume, tradeCount);
+    }
+}

src/main/java/stream/ohlc/OHLCAccumulator.java

@@ -0,0 +1,41 @@
+package stream.ohlc;
+
+import java.math.BigDecimal;
+
+public class OHLCAccumulator {
+    public String pool = null;
+    public String token0 = null;  // Added
+    public String token1 = null;  // Added
+    public BigDecimal open = null;
+    public BigDecimal high = null;
+    public BigDecimal low = null;
+    public BigDecimal close = null;
+    public BigDecimal volume = BigDecimal.ZERO;
+    public int tradeCount = 0;
+    public long firstTradeTime = 0;
+    public long lastTradeTime = 0;
+
+    public OHLCAccumulator() {}
+
+    public void updatePrice(BigDecimal price, long timestamp) {
+        if (open == null) {
+            open = price;
+            high = price;
+            low = price;
+            firstTradeTime = timestamp;
+        } else {
+            high = high.max(price);
+            low = low.min(price);
+        }
+        close = price;
+        lastTradeTime = timestamp;
+    }
+
+    public void addVolume(BigDecimal amount) {
+        volume = volume.add(amount);
+    }
+
+    public void incrementTradeCount() {
+        tradeCount++;
+    }
+}

src/main/java/stream/ohlc/OHLCAggregator.java

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+package stream.ohlc;
+
+import org.apache.flink.api.common.functions.AggregateFunction;
+import stream.dto.Swap;
+import stream.dto.OHLCCandle;
+import java.math.BigDecimal;
+
+public class OHLCAggregator implements AggregateFunction<Swap, OHLCAccumulator, OHLCCandle> {
+
+    private final long windowSize = 60; // 1 minute in seconds
+
+    @Override
+    public OHLCAccumulator createAccumulator() {
+        return new OHLCAccumulator();
+    }
+
+    @Override
+    public OHLCAccumulator add(Swap swap, OHLCAccumulator accumulator) {
+        // Initialize pool and tokens on first swap
+        if (accumulator.pool == null) {
+            accumulator.pool = swap.getPool();
+            // Store tokens in consistent order (you could sort by address)
+            accumulator.token0 = swap.getTakerAsset();
+            accumulator.token1 = swap.getMakerAsset();
+        }
+        
+        // Update OHLC prices
+        accumulator.updatePrice(swap.getPrice(), swap.getTime());
+
+        // Calculate volume (using the taker's input amount as volume)
+        BigDecimal volume = swap.getAmountIn().abs();
+        accumulator.addVolume(volume);
+
+        // Increment trade count
+        accumulator.incrementTradeCount();
+
+        return accumulator;
+    }
+
+    @Override
+    public OHLCAccumulator merge(OHLCAccumulator acc1, OHLCAccumulator acc2) {
+        OHLCAccumulator merged = new OHLCAccumulator();
+
+        // Merge pool and token info
+        merged.pool = acc1.pool != null ? acc1.pool : acc2.pool;
+        merged.token0 = acc1.token0 != null ? acc1.token0 : acc2.token0;
+        merged.token1 = acc1.token1 != null ? acc1.token1 : acc2.token1;
+
+        // Merge OHLC data
+        if (acc1.open != null && acc2.open != null) {
+            merged.open = acc1.firstTradeTime <= acc2.firstTradeTime ? acc1.open : acc2.open;
+            merged.close = acc1.lastTradeTime >= acc2.lastTradeTime ? acc1.close : acc2.close;
+            merged.high = acc1.high.max(acc2.high);
+            merged.low = acc1.low.min(acc2.low);
+            merged.firstTradeTime = Math.min(acc1.firstTradeTime, acc2.firstTradeTime);
+            merged.lastTradeTime = Math.max(acc1.lastTradeTime, acc2.lastTradeTime);
+        } else if (acc1.open != null) {
+            merged.open = acc1.open;
+            merged.close = acc1.close;
+            merged.high = acc1.high;
+            merged.low = acc1.low;
+            merged.firstTradeTime = acc1.firstTradeTime;
+            merged.lastTradeTime = acc1.lastTradeTime;
+        } else if (acc2.open != null) {
+            merged.open = acc2.open;
+            merged.close = acc2.close;
+            merged.high = acc2.high;
+            merged.low = acc2.low;
+            merged.firstTradeTime = acc2.firstTradeTime;
+            merged.lastTradeTime = acc2.lastTradeTime;
+        }
+
+        merged.volume = acc1.volume.add(acc2.volume);
+        merged.tradeCount = acc1.tradeCount + acc2.tradeCount;
+
+        return merged;
+    }
+
+    @Override
+    public OHLCCandle getResult(OHLCAccumulator accumulator) {
+        long windowStart = (accumulator.firstTradeTime / windowSize) * windowSize;
+        long windowEnd = windowStart + windowSize;
+
+        return new OHLCCandle(
+            accumulator.pool,
+            accumulator.token0,
+            accumulator.token1,
+            windowStart,
+            windowEnd,
+            accumulator.open,
+            accumulator.high,
+            accumulator.low,
+            accumulator.close,
+            accumulator.volume,
+            accumulator.tradeCount
+        );
+    }
+}

src/main/java/stream/ohlc/OHLCPipeline.java

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+package stream.ohlc;
+
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows;
+import java.time.Duration;
+import stream.dto.Swap;
+import stream.dto.OHLCCandle;
+
+public class OHLCPipeline {
+
+    public DataStream<OHLCCandle> createOHLCStream(DataStream<Swap> swapStream) {
+
+        return swapStream
+                // NO watermarks needed for processing-time windows
+                .keyBy(Swap::getPool)
+
+                // Use 1-minute processing-time windows
+                .window(TumblingProcessingTimeWindows.of(Duration.ofMinutes(1)))
+
+                // Simply use the aggregator
+                .aggregate(new OHLCAggregator())
+
+                // Filter out empty windows
+                .filter(candle -> candle.getTradeCount() > 0);
+    }
+}