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add consumer side logic to read blob metadata for delta to version
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42 changes: 42 additions & 0 deletions
42
...main/java/com/netflix/hollow/test/consumer/TestBlobRetrieverWithNearestSnapshotMatch.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| package com.netflix.hollow.test.consumer; | ||
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| import com.netflix.hollow.api.consumer.HollowConsumer; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
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| public class TestBlobRetrieverWithNearestSnapshotMatch extends TestBlobRetriever { | ||
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| @Override | ||
| public HollowConsumer.Blob retrieveSnapshotBlob(long desiredVersion) { | ||
| long version = findNearestSnapshotVersion(desiredVersion); | ||
| HollowConsumer.Blob b = snapshots.get(version); | ||
| resetStream(b); | ||
| return b; | ||
| } | ||
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| private long findNearestSnapshotVersion(long desiredVersion) { | ||
| List<Long> snapshotVersions = new ArrayList<>(); | ||
| snapshotVersions.addAll(snapshots.keySet()); | ||
| Collections.sort(snapshotVersions); | ||
| int start = 0; | ||
| int end = snapshotVersions.size() - 1; | ||
| int mid = 0; | ||
| while (start + 1< end) { | ||
| mid = (start + end) / 2; | ||
| if (mid < desiredVersion) { | ||
| start = mid; | ||
| } else if (mid > desiredVersion){ | ||
| end = mid; | ||
| } else { | ||
| return snapshotVersions.get(mid); | ||
| } | ||
| } | ||
| if (end <= desiredVersion) { | ||
| return snapshotVersions.get(end); | ||
| } | ||
| return snapshotVersions.get(start); | ||
| } | ||
| } |
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21 changes: 21 additions & 0 deletions
21
hollow/src/main/java/com/netflix/hollow/api/error/VersionMismatchException.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package com.netflix.hollow.api.error; | ||
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| public class VersionMismatchException extends HollowException { | ||
| private final long expectedVersion; | ||
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| private final long actualVersion; | ||
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| public VersionMismatchException(long expectedVersion, long actualVersion) { | ||
| super("toVersion in blob didn't match toVersion seen in metadata; actualToVersion=" + actualVersion + ", expectedToVersion=" + expectedVersion); | ||
| this.expectedVersion = expectedVersion; | ||
| this.actualVersion = actualVersion; | ||
| } | ||
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| public long getExpectedVersion() { | ||
| return expectedVersion; | ||
| } | ||
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| public long getActualVersion() { | ||
| return actualVersion; | ||
| } | ||
| } |
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