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Mdb env set mapsize #112

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Merged
benalexau merged 3 commits into from
Dec 16, 2018
Merged

Mdb env set mapsize #112

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a367407
Add Env.setMapSize(final long mapSize) (fixes #104)
altesse Dec 11, 2018
c247816
Merge branch 'master' of https://github.com/altesse/lmdbjava into mdb…
altesse Dec 11, 2018
3d26abc
Fix setMapSize test reliability
altesse Dec 11, 2018
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9 changes: 9 additions & 0 deletions src/main/java/org/lmdbjava/Env.java
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Original file line number Diff line number Diff line change
Expand Up @@ -383,6 +383,15 @@ Pointer pointer() {
return ptr;
}

/**
* Set the size of the data memory map.
*
* @param mapSize the new size, in bytes
*/
public void setMapSize(final long mapSize) {
checkRc(LIB.mdb_env_set_mapsize(ptr, mapSize));
}

/**
* Object has already been closed and the operation is therefore prohibited.
*/
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48 changes: 48 additions & 0 deletions src/test/java/org/lmdbjava/EnvTest.java
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Expand Up @@ -250,6 +250,54 @@ public void mapFull() throws IOException {
}
}

@Test
public void setMapSize() throws IOException {
final File path = tmp.newFolder();
final byte[] k = new byte[500];
final ByteBuffer key = allocateDirect(500);
final ByteBuffer val = allocateDirect(1_024);
final Random rnd = new Random();
try (Env<ByteBuffer> env = create().setMapSize(50_000)
.setMaxDbs(1).open(path)) {
final Dbi<ByteBuffer> db = env.openDbi(DB_1, MDB_CREATE);

db.put(bb(1), bb(42));
boolean mapFullExThrown = false;
try {
for (int i = 0; i < 30; i++) {
rnd.nextBytes(k);
key.clear();
key.put(k).flip();
val.clear();
db.put(key, val);
}
} catch (final MapFullException mfE) {
mapFullExThrown = true;
}
assertThat(mapFullExThrown, is(true));

env.setMapSize(500_000);

try (Txn<ByteBuffer> roTxn = env.txnRead()) {
assertThat(db.get(roTxn, bb(1)), is(bb(42)));
}

mapFullExThrown = false;
try {
for (int i = 0; i < 30; i++) {
rnd.nextBytes(k);
key.clear();
key.put(k).flip();
val.clear();
db.put(key, val);
}
} catch (final MapFullException mfE) {
mapFullExThrown = true;
}
assertThat(mapFullExThrown, is(false));
}
}

@Test
public void readOnlySupported() throws IOException {
final File path = tmp.newFolder();
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