Examples of org.xtreemfs.babudb.api.database.DatabaseRO.lookup()

Package org.xtreemfs.babudb.api.database

Class org.xtreemfs.babudb.api.database.DatabaseRO

Examples of org.xtreemfs.babudb.api.database.DatabaseRO.lookup()

org.xtreemfs.babudb.api.database.DatabaseRO.lookup()
Performs a lookup for a single key. The result object contains a byte array containing the value, or null if the key could not be found. @param indexId index id (0..NumIndices-1) @param key the key to look up @param context arbitrary context which is passed to the listener. @return a future as proxy for the request result.

        ir.addInsert(1, "bla".getBytes(), "blub".getBytes());
        db.insert(ir, null).get();
        
        // check if the snapshot still contains the old values
        for (int i = 1; i < 4; i++)
            assertEquals("Value" + i, new String(snap1.lookup(0, ("Key" + i).getBytes(), null).get()));
        
        Iterator<Entry<byte[], byte[]>> it = snap1.prefixLookup(0, "Key".getBytes(), null).get();
        for (int i = 1; i < 4; i++) {
            Entry<byte[], byte[]> next = it.next();
            assertEquals("Key" + i, new String(next.getKey()));

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            Entry<byte[], byte[]> next = it.next();
            assertEquals("Key" + i, new String(next.getKey()));
            assertEquals("Value" + i, new String(next.getValue()));
        }
        
        assertNull(snap1.lookup(1, "bla".getBytes(), null).get());
        
        // create a checkpoint
        database.getCheckpointer().checkpoint();
        
        // create a second snapshot

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        // the correct values
        for (int i = 1; i < 4; i++)
            assertEquals("Value" + i, new String(snap1.lookup(0, ("Key" + i).getBytes(), null).get()));
        
        for (int i = 1; i < 4; i++)
            assertEquals("x", new String(snap2.lookup(0, ("Key" + i).getBytes(), null).get()));
        
        it = snap1.prefixLookup(0, "Key".getBytes(), null).get();
        for (int i = 1; i < 4; i++) {
            Entry<byte[], byte[]> next = it.next();
            assertEquals("Key" + i, new String(next.getKey()));

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            Entry<byte[], byte[]> next = it.next();
            assertEquals("Key" + i, new String(next.getKey()));
            assertEquals("x", new String(next.getValue()));
        }
        
        assertEquals("blub", new String(snap2.lookup(1, "bla".getBytes(), null).get()));
        
    }
    
    public void testPartialSnapshot() throws Exception {

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        ir.addInsert(3, "bar".getBytes(), "x".getBytes());
        db.insert(ir, null).get();
        
        // check whether the snapshot contains exactly the specified key-value
        // pairs
        assertEquals("v1", new String(snap1.lookup(0, "testxyz".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(0, "test".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "testabc".getBytes(), null).get());
        assertNull(snap1.lookup(0, "yagga".getBytes(), null).get());
        assertEquals("v1", new String(snap1.lookup(3, "foo".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(3, "bar".getBytes(), null).get()));

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        db.insert(ir, null).get();
        
        // check whether the snapshot contains exactly the specified key-value
        // pairs
        assertEquals("v1", new String(snap1.lookup(0, "testxyz".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(0, "test".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "testabc".getBytes(), null).get());
        assertNull(snap1.lookup(0, "yagga".getBytes(), null).get());
        assertEquals("v1", new String(snap1.lookup(3, "foo".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(3, "bar".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "test2".getBytes(), null).get());

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        // check whether the snapshot contains exactly the specified key-value
        // pairs
        assertEquals("v1", new String(snap1.lookup(0, "testxyz".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(0, "test".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "testabc".getBytes(), null).get());
        assertNull(snap1.lookup(0, "yagga".getBytes(), null).get());
        assertEquals("v1", new String(snap1.lookup(3, "foo".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(3, "bar".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "test2".getBytes(), null).get());

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        // check whether the snapshot contains exactly the specified key-value
        // pairs
        assertEquals("v1", new String(snap1.lookup(0, "testxyz".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(0, "test".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "testabc".getBytes(), null).get());
        assertNull(snap1.lookup(0, "yagga".getBytes(), null).get());
        assertEquals("v1", new String(snap1.lookup(3, "foo".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(3, "bar".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "test2".getBytes(), null).get());
        
        Iterator<Entry<byte[], byte[]>> it = snap1.prefixLookup(0, null, null).get();

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        // pairs
        assertEquals("v1", new String(snap1.lookup(0, "testxyz".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(0, "test".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "testabc".getBytes(), null).get());
        assertNull(snap1.lookup(0, "yagga".getBytes(), null).get());
        assertEquals("v1", new String(snap1.lookup(3, "foo".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(3, "bar".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "test2".getBytes(), null).get());
        
        Iterator<Entry<byte[], byte[]>> it = snap1.prefixLookup(0, null, null).get();
        Entry<byte[], byte[]> next = it.next();

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        assertEquals("v1", new String(snap1.lookup(0, "testxyz".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(0, "test".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "testabc".getBytes(), null).get());
        assertNull(snap1.lookup(0, "yagga".getBytes(), null).get());
        assertEquals("v1", new String(snap1.lookup(3, "foo".getBytes(), null).get()));
        assertEquals("v2", new String(snap1.lookup(3, "bar".getBytes(), null).get()));
        assertNull(snap1.lookup(0, "test2".getBytes(), null).get());
        
        Iterator<Entry<byte[], byte[]>> it = snap1.prefixLookup(0, null, null).get();
        Entry<byte[], byte[]> next = it.next();
        assertEquals("test", new String(next.getKey()));

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