[GitHub] sijie closed pull request #208: Issue 207: Support getFirstLogRecord

[GitBox <gi...@apache.org>]

sijie closed pull request #208: Issue 207: Support getFirstLogRecord
URL: https://github.com/apache/distributedlog/pull/208
 
 
   

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git a/distributedlog-core/src/main/java/org/apache/distributedlog/BKDistributedLogManager.java b/distributedlog-core/src/main/java/org/apache/distributedlog/BKDistributedLogManager.java
index d5d14774..5ca76d35 100644
--- a/distributedlog-core/src/main/java/org/apache/distributedlog/BKDistributedLogManager.java
+++ b/distributedlog-core/src/main/java/org/apache/distributedlog/BKDistributedLogManager.java
@@ -273,7 +273,8 @@ private synchronized BKLogReadHandler getReadHandlerAndRegisterListener(
         return Utils.ioResult(getLogSegmentsAsync());
     }
 
-    protected CompletableFuture<List<LogSegmentMetadata>> getLogSegmentsAsync() {
+    @Override
+    public CompletableFuture<List<LogSegmentMetadata>> getLogSegmentsAsync() {
         final BKLogReadHandler readHandler = createReadHandler();
         return readHandler.readLogSegmentsFromStore(
                 LogSegmentMetadata.COMPARATOR,
@@ -901,6 +902,16 @@ public DLSN getLastDLSN() throws IOException {
         return getFirstRecordAsyncInternal().thenApply(RECORD_2_DLSN_FUNCTION);
     }
 
+    @Override
+    public LogRecordWithDLSN getFirstLogRecord() throws IOException {
+        return Utils.ioResult(getFirstRecordAsyncInternal());
+    }
+
+    @Override
+    public CompletableFuture<LogRecordWithDLSN> getFirstLogRecordAsync() {
+        return getFirstRecordAsyncInternal();
+    }
+
     private CompletableFuture<LogRecordWithDLSN> getFirstRecordAsyncInternal() {
         return processReaderOperation(new Function<BKLogReadHandler, CompletableFuture<LogRecordWithDLSN>>() {
             @Override
diff --git a/distributedlog-core/src/main/java/org/apache/distributedlog/LogSegmentMetadata.java b/distributedlog-core/src/main/java/org/apache/distributedlog/LogSegmentMetadata.java
index c8907b5e..0e4a2f09 100644
--- a/distributedlog-core/src/main/java/org/apache/distributedlog/LogSegmentMetadata.java
+++ b/distributedlog-core/src/main/java/org/apache/distributedlog/LogSegmentMetadata.java
@@ -83,8 +83,8 @@ public static LogSegmentMetadataVersion of(int version) {
     /**
      * TruncationStatus.
      */
-    public  enum TruncationStatus {
-        ACTIVE (0), PARTIALLY_TRUNCATED(1), TRUNCATED (2);
+    public enum TruncationStatus {
+        UNKNOWN(-1), ACTIVE (0), PARTIALLY_TRUNCATED(1), TRUNCATED (2);
         private final int value;
 
         private TruncationStatus(int value) {
@@ -503,6 +503,19 @@ public long getStartSequenceId() {
                 ? startSequenceId : Long.MIN_VALUE + (getLogSegmentSequenceNumber() << 32L);
     }
 
+    public TruncationStatus getTruncationStatus() {
+        switch ((int) (status & METADATA_TRUNCATION_STATUS_MASK)) {
+            case 0:
+                return TruncationStatus.ACTIVE;
+            case 1:
+                return TruncationStatus.PARTIALLY_TRUNCATED;
+            case 2:
+                return TruncationStatus.TRUNCATED;
+            default:
+                return TruncationStatus.UNKNOWN;
+        }
+    }
+
     public boolean isTruncated() {
         return ((status & METADATA_TRUNCATION_STATUS_MASK)
                 == TruncationStatus.TRUNCATED.value);
@@ -530,6 +543,14 @@ public DLSN getMinActiveDLSN() {
         return minActiveDLSN;
     }
 
+    public long getMinActiveEntryId() {
+        return minActiveDLSN.getEntryId();
+    }
+
+    public long getMinActiveSlotId() {
+        return minActiveDLSN.getSlotId();
+    }
+
     public DLSN getFirstDLSN() {
         return new DLSN(getLogSegmentSequenceNumber(), 0, 0);
     }
diff --git a/distributedlog-core/src/main/java/org/apache/distributedlog/api/DistributedLogManager.java b/distributedlog-core/src/main/java/org/apache/distributedlog/api/DistributedLogManager.java
index fb9c6be9..db4b65e2 100644
--- a/distributedlog-core/src/main/java/org/apache/distributedlog/api/DistributedLogManager.java
+++ b/distributedlog-core/src/main/java/org/apache/distributedlog/api/DistributedLogManager.java
@@ -71,6 +71,14 @@
      */
     List<LogSegmentMetadata> getLogSegments() throws IOException;
 
+
+    /**
+     * Get the log segments asynchronously.
+     *
+     * @return the log segments
+     */
+    CompletableFuture<List<LogSegmentMetadata>> getLogSegmentsAsync();
+
     /**
      * Register <i>listener</i> on log segment updates of this stream.
      *
@@ -296,6 +304,22 @@ LogRecordWithDLSN getLastLogRecord()
     CompletableFuture<LogRecordWithDLSN> getLastLogRecordAsync();
 
     /**
+     * Get the first log record in the stream.
+     *
+     * @return the first log record in the stream
+     * @throws IOException if a stream cannot be found.
+     */
+    LogRecordWithDLSN getFirstLogRecord()
+        throws IOException;
+
+    /**
+     * Get first log record with DLSN in the log - async.
+     *
+     * @return latest log record with DLSN
+     */
+    CompletableFuture<LogRecordWithDLSN> getFirstLogRecordAsync();
+
+    /**
      * Get the earliest Transaction Id available in the log.
      *
      * @return earliest transaction id


 

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