Examples with ExcerptTailer net.openhft.chronicle.queue.ExcerptTailer used on opensource projects

Example 21 with ExcerptTailer

use of net.openhft.chronicle.queue.ExcerptTailer in project Chronicle-Queue by OpenHFT.

the class SingleChronicleQueueTest method testScanFromLastKnownIndex.

@Test
public void testScanFromLastKnownIndex() {
    final File file = createTempFile("testScanFromLastKnownIndex");
    try {
        final SingleChronicleQueue chronicle = (SingleChronicleQueue) createQueue(file);
        final ExcerptAppender appender = chronicle.acquireAppender();
        // create 100 documents
        for (int i = 0; i < 65; i++) {
            final int j = i;
            appender.writeDocument(wire -> wire.write(() -> "key").text("value=" + j));
        }
        // creates the indexes - index's 1 and 2 are created by the indexer
        new Indexer(chronicle).index();
        // create 100 documents
        for (long i = chronicle.lastIndex() + 1; i < 200; i++) {
            final long j = i;
            appender.writeDocument(wire -> wire.write(() -> "key").text("value=" + j));
        }
        final ExcerptTailer tailer = chronicle.createTailer();
        {
            int expected = 150;
            tailer.index(expected);
            StringBuilder sb = new StringBuilder();
            tailer.readDocument(wire -> wire.read(() -> "key").text(sb));
            Assert.assertEquals("value=" + expected, sb.toString());
        }
        // read back earlier
        {
            int expected = 167;
            tailer.index(expected);
            StringBuilder sb = new StringBuilder();
            tailer.readDocument(wire -> wire.read(() -> "key").text(sb));
            Assert.assertEquals("value=" + expected, sb.toString());
        }
    } finally {
        file.delete();
    }
}

Example 22 with ExcerptTailer

use of net.openhft.chronicle.queue.ExcerptTailer in project Chronicle-Queue by OpenHFT.

the class SingleChronicleQueueTest method testReadAtIndexWithIndexesAtStart.

@Test
public void testReadAtIndexWithIndexesAtStart() {
    final File file = createTempFile("testReadAtIndexWithIndexesAtStart");
    try {
        final SingleChronicleQueue chronicle = (SingleChronicleQueue) createQueue(file);
        final ExcerptAppender appender = chronicle.acquireAppender();
        // create 100 documents
        for (int i = 0; i < 100; i++) {
            final int j = i;
            appender.writeDocument(wire -> wire.write(() -> "key").text("value=" + j));
        }
        new Indexer(chronicle).index();
        long index = 67;
        final ExcerptTailer tailer = chronicle.createTailer();
        tailer.index(index);
        StringBuilder sb = new StringBuilder();
        tailer.readDocument(wire -> wire.read(() -> "key").text(sb));
        Assert.assertEquals("value=" + index, sb.toString());
    } finally {
        file.delete();
    }
}

Example 23 with ExcerptTailer

use of net.openhft.chronicle.queue.ExcerptTailer in project Chronicle-Queue by OpenHFT.

the class SingleChronicleQueueTest method testSingleDirect.

@Test
public void testSingleDirect() {
    final File file = createTempFile("testSingleDirect");
    try {
        final DirectChronicleQueue chronicle = createQueue(file);
        final ExcerptAppender appender = chronicle.acquireAppender();
        // create 100 documents
        for (int i = 0; i < 100; i++) {
            final int j = i;
            appender.writeDocument(wire -> wire.write(() -> "key").text("value=" + j));
        }
        final ExcerptTailer tailer = chronicle.createTailer();
        final StringBuilder sb = new StringBuilder();
        for (int j = 0; j < chronicle.lastIndex(); j++) {
            sb.setLength(0);
            tailer.readDocument(wire -> wire.read(() -> "key").text(sb));
            Assert.assertEquals("value=" + j, sb.toString());
        }
    } finally {
        file.delete();
    }
}

Example 24 with ExcerptTailer

use of net.openhft.chronicle.queue.ExcerptTailer in project Chronicle-Queue by OpenHFT.

the class SingleChronicleQueueTest method testReadAtIndexWithIndexes.

@Test
public void testReadAtIndexWithIndexes() {
    final File file = createTempFile("testReadAtIndexWithIndexes");
    try {
        final SingleChronicleQueue chronicle = (SingleChronicleQueue) createQueue(file);
        final ExcerptAppender appender = chronicle.acquireAppender();
        // create 100 documents
        for (int i = 0; i < 100; i++) {
            final int j = i;
            appender.writeDocument(wire -> wire.write(() -> "key").text("value=" + j));
        }
        // creates the indexes
        new Indexer(chronicle).index();
        final ExcerptTailer tailer = chronicle.createTailer();
        tailer.index(67);
        StringBuilder sb = new StringBuilder();
        tailer.readDocument(wire -> wire.read(() -> "key").text(sb));
        Assert.assertEquals("value=67", sb.toString());
    } finally {
        file.delete();
    }
}

Example 25 with ExcerptTailer

use of net.openhft.chronicle.queue.ExcerptTailer in project Chronicle-Queue by OpenHFT.

the class SingleChronicleQueueTest method testReadAtIndex.

@Test
public void testReadAtIndex() {
    final File file = createTempFile("testReadAtIndex");
    try {
        final DirectChronicleQueue chronicle = createQueue(file);
        final ExcerptAppender appender = chronicle.acquireAppender();
        // create 100 documents
        for (int i = 0; i < 100; i++) {
            final int j = i;
            appender.writeDocument(wire -> wire.write(() -> "key").text("value=" + j));
        }
        final ExcerptTailer tailer = chronicle.createTailer();
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 100; i++) {
            tailer.index(i);
            sb.setLength(0);
            tailer.readDocument(wire -> wire.read(() -> "key").text(sb));
            Assert.assertEquals("value=" + i, sb.toString());
        }
    } finally {
        file.delete();
    }
}