Example usage for java.nio.channels Channels newChannel

Introduction

In this page you can find the example usage for java.nio.channels Channels newChannel.

Prototype

public static WritableByteChannel newChannel(OutputStream out) 

Source Link

Document

Constructs a channel that writes bytes to the given stream.

Usage

From source file:com.sunchenbin.store.feilong.core.io.IOWriteUtil.java

/**
 * NIO API ?? ()./*  w  ww  .j  a v a 2  s .co  m*/
 * 
 * <h3>NIO</h3>
 * 
 * <blockquote>
 * <p>
 * nionew io,jdk1.4,??<br>
 * nio??<br>
 * </p>
 * 
 * <p>
 * ??,<br>
 * ?,,??? ????cpu,?cpu? <br>
 * ? Java IO ,? IO,NIO ?? IO
 * </p>
 * 
 * <p>
 * The new I/O (NIO) APIs introduced in v 1.4 provide new features and improved performance in the areas of buffer management, scalable
 * network and file I/O, character-set support, and regular-expression matching. The NIO APIs supplement the I/O facilities in the
 * java.io package.
 * </p>
 * 
 * <p>
 * The NIO APIs include the following features:
 * </p>
 * 
 * <ol>
 * <li>Buffers for data of primitive types</li>
 * <li>Character-set encoders and decoders</li>
 * <li>A pattern-matching facility based on Perl-style regular expressions</li>
 * <li>Channels, a new primitive I/O abstraction</li>
 * <li>A file interface that supports locks and memory mapping</li>
 * <li>A multiplexed, non-blocking I/O facility for writing scalable servers</li>
 * </ol>
 * </blockquote>
 * 
 * <p>
 * As creme de la creme with regard to performance,you could use NIO {@link java.nio.channels.Channels} and {@link java.nio.ByteBuffer}.
 * </p>
 *
 * @param bufferLength
 *            the buffer length
 * @param inputStream
 *            the input stream
 * @param outputStream
 *            the output stream
 * @since 1.0.8
 * @since jdk1.4
 */
private static void writeUseNIO(int bufferLength, InputStream inputStream, OutputStream outputStream) {
    Date beginDate = new Date();
    ReadableByteChannel readableByteChannel = Channels.newChannel(inputStream);
    WritableByteChannel writableByteChannel = Channels.newChannel(outputStream);
    ByteBuffer byteBuffer = ByteBuffer.allocate(bufferLength);

    try {
        int loopCount = 0;
        int sumSize = 0;
        while (readableByteChannel.read(byteBuffer) != -1) {
            byteBuffer.flip();
            sumSize += writableByteChannel.write(byteBuffer);
            byteBuffer.clear();
            loopCount++;
        }
        if (LOGGER.isDebugEnabled()) {
            String formatSize = FileUtil.formatSize(sumSize);
            String time = DateExtensionUtil.getIntervalForView(beginDate, new Date());
            LOGGER.debug("Write data over,sumSize:[{}],bufferLength:[{}],loopCount:[{}],time:{}", formatSize,
                    bufferLength, loopCount, time);
        }
    } catch (IOException e) {
        throw new UncheckedIOException(e);
    } finally {
        IOUtils.closeQuietly(outputStream);
        IOUtils.closeQuietly(writableByteChannel);
        IOUtils.closeQuietly(inputStream);
        IOUtils.closeQuietly(readableByteChannel);
    }
}

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From source file:org.eclipse.thym.core.internal.util.FileUtils.java

private static void createFileFromZipFile(File file, ZipFile zipFile, ZipEntry zipEntry) throws IOException {
    if (!file.getParentFile().exists() && !file.getParentFile().mkdirs()) {
        throw new IOException("Can not create parent directory for " + file.toString());
    }/*from  w w w . j  a  v a2s.com*/
    file.createNewFile();
    FileOutputStream fout = null;
    FileChannel out = null;
    InputStream in = null;
    try {
        fout = new FileOutputStream(file);
        out = fout.getChannel();
        in = zipFile.getInputStream(zipEntry);
        out.transferFrom(Channels.newChannel(in), 0, Integer.MAX_VALUE);
    } finally {
        if (out != null)
            out.close();
        if (in != null)
            in.close();
        if (fout != null)
            fout.close();
    }
}

---

From source file:org.alfresco.contentstore.ContentStoreTest.java

@Test
public void test2() throws Exception {
    UserContext.setUser("user1");

    checksumService.setBlockSize(1024 * 8); // 8K

    String nodeId = GUID.generate();
    long nodeVersion = 1l;
    MimeType mimeType = MimeType.XLSX;
    final Node node = Node.build().nodeId(nodeId).nodeVersion(nodeVersion).mimeType(mimeType);

    try (InputStream in = getClass().getClassLoader().getResourceAsStream("test.xlsx");
            OutputStream out = contentStore.getWriter(node).getOutputStream()) {
        time(new Task<Void>() {
            @Override//from   www. j a v  a2 s . co m
            public String message() {
                return "Copy test.xlsx to Cassandra content store";
            }

            @Override
            public Void execute() throws Exception {
                IOUtils.copy(in, out);
                return null;
            }
        });
    }

    assertFileEquals(time(new Task<InputStream>() {
        @Override
        public String message() {
            return "Get test.xlsx from local file store";
        }

        @Override
        public InputStream execute() throws Exception {
            return getClass().getClassLoader().getResourceAsStream("test.xlsx");
        }
    }), time(new Task<InputStream>() {
        @Override
        public String message() {
            return "Get test.xlsx from Cassandra content store";
        }

        @Override
        public InputStream execute() throws Exception {
            return contentStore.getReader(node).getStream();
        }
    }), new State());

    try (ReadableByteChannel channel1 = Channels
            .newChannel(getClass().getClassLoader().getResourceAsStream("test1.xlsx"))) {
        PatchDocument patchDocument = getPatch(node, channel1);

        long start = System.nanoTime();

        contentStore.applyPatch(node, patchDocument);

        long end = System.nanoTime();
        System.out.println("Patch applied time = " + (end - start) / 1000000 + "ms");

        Node node1 = node.nodeVersion(node.getNodeVersion() + 1);
        ContentReader reader1 = contentStore.getReader(node1);
        try (InputStream in3 = getClass().getClassLoader().getResourceAsStream("test1.xlsx");
                InputStream in4 = reader1.getStream()) {
            assertFileEquals(in3, in4, new State());
        }
    } finally {
        UserContext.clearUser();
    }
}

---

From source file:org.getspout.spout.Spout.java

protected void update() {
    //test install once
    File runOnce = new File(getDataFolder(), "runonce");
    if (!runOnce.exists()) {
        try {/*ww w.  j  a v  a  2 s .  c  o m*/
            runOnce.createNewFile();
            pingLink("http://bit.ly/spoutserverrunonce");
        } catch (Exception e) {
        }
    }
    if (!isUpdateAvailable()) {
        return;
    }
    FileOutputStream fos = null;
    try {
        File directory = new File(Bukkit.getServer().getUpdateFolder());
        if (!directory.exists()) {
            try {
                directory.mkdir();
            } catch (SecurityException e1) {
            }
        }
        File tempDirectory = new File(directory, "temp");
        if (!tempDirectory.exists()) {
            try {
                tempDirectory.mkdir();
            } catch (SecurityException e1) {
            }
        }
        File plugin = new File(directory.getPath(), "Spout.jar");
        File temp = new File(tempDirectory.getPath(), "Spout.jar");
        if (!plugin.exists()) {
            URL spout = new URL(
                    "http://ci.getspout.org/view/SpoutDev/job/Spout/promotion/latest/Recommended/artifact/target/spout-dev-SNAPSHOT.jar");
            HttpURLConnection con = (HttpURLConnection) (spout.openConnection());
            System.setProperty("http.agent", ""); //Spoofing the user agent is required to track stats
            con.setRequestProperty("User-Agent",
                    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.100 Safari/534.30");
            ReadableByteChannel rbc = Channels.newChannel(con.getInputStream());
            fos = new FileOutputStream(temp);
            fos.getChannel().transferFrom(rbc, 0, 1 << 24);
        }
        if (temp.exists()) {
            FileUtils.moveFile(temp, plugin);
        }
    } catch (Exception e) {
    } finally {
        if (fos != null) {
            try {
                fos.close();
            } catch (IOException e) {
            }
        }
    }
}

---

From source file:com.meltmedia.cadmium.core.FileSystemManager.java

public static void streamCopy(InputStream streamIn, OutputStream streamOut, boolean leaveOutputOpen)
        throws IOException {
    ReadableByteChannel input = Channels.newChannel(streamIn);
    WritableByteChannel output = Channels.newChannel(streamOut);

    ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);

    while (input.read(buffer) != -1) {
        buffer.flip();//from w  w  w.j  a  v  a2  s .  com

        output.write(buffer);

        buffer.compact();
    }

    buffer.flip();

    // Make sure the buffer is empty
    while (buffer.hasRemaining()) {
        output.write(buffer);
    }

    input.close();
    if (!leaveOutputOpen) {
        output.close();
    }
}

---

From source file:org.apache.pulsar.functions.utils.Utils.java

public static NarClassLoader extractNarClassLoader(Path archivePath, String pkgUrl,
        File uploadedInputStreamFileName) {
    if (archivePath != null) {
        try {/*from   w w w .ja v  a  2  s  . co m*/
            return NarClassLoader.getFromArchive(archivePath.toFile(), Collections.emptySet());
        } catch (IOException e) {
            throw new IllegalArgumentException(String.format("The archive %s is corrupted", archivePath));
        }
    }
    if (!isEmpty(pkgUrl)) {
        if (pkgUrl.startsWith(org.apache.pulsar.common.functions.Utils.FILE)) {
            try {
                URL url = new URL(pkgUrl);
                File file = new File(url.toURI());
                if (!file.exists()) {
                    throw new IOException(pkgUrl + " does not exists locally");
                }
                return NarClassLoader.getFromArchive(file, Collections.emptySet());
            } catch (Exception e) {
                throw new IllegalArgumentException(
                        "Corrupt User PackageFile " + pkgUrl + " with error " + e.getMessage());
            }
        } else if (pkgUrl.startsWith("http")) {
            try {
                URL website = new URL(pkgUrl);
                File tempFile = File.createTempFile("function", ".tmp");
                ReadableByteChannel rbc = Channels.newChannel(website.openStream());
                try (FileOutputStream fos = new FileOutputStream(tempFile)) {
                    fos.getChannel().transferFrom(rbc, 0, 10);
                }
                if (tempFile.exists()) {
                    tempFile.delete();
                }
                return NarClassLoader.getFromArchive(tempFile, Collections.emptySet());
            } catch (Exception e) {
                throw new IllegalArgumentException(
                        "Corrupt User PackageFile " + pkgUrl + " with error " + e.getMessage());
            }
        } else {
            throw new IllegalArgumentException(
                    "Unsupported url protocol " + pkgUrl + ", supported url protocols: [file/http/https]");
        }
    }
    if (uploadedInputStreamFileName != null) {
        try {
            return NarClassLoader.getFromArchive(uploadedInputStreamFileName, Collections.emptySet());
        } catch (IOException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }
    return null;
}

---

From source file:backtype.storm.utils.Utils.java

public static void downloadFromMaster(Map conf, String file, String localFile) throws IOException, TException {
    WritableByteChannel out = null;
    NimbusClient client = null;/* ww  w  . j a v  a  2  s.com*/
    try {
        client = NimbusClient.getConfiguredClient(conf, 10 * 1000);
        String id = client.getClient().beginFileDownload(file);
        out = Channels.newChannel(new FileOutputStream(localFile));
        while (true) {
            ByteBuffer chunk = client.getClient().downloadChunk(id);
            int written = out.write(chunk);
            if (written == 0) {
                client.getClient().finishFileDownload(id);
                break;
            }
        }
    } finally {
        if (out != null)
            out.close();
        if (client != null)
            client.close();
    }
}

---

From source file:org.alfresco.contentstore.ContentStoreTest.java

@Test
public void test3() throws IOException {
    checksumService.setBlockSize(8192);//w w  w  . j  a va 2s  .c  o  m

    UserContext.setUser("user1");

    File f = copy("marbles-uncompressed.tif");
    Node node = Node.build().nodeId(GUID.generate()).nodeVersion(1l);

    try (InputStream in = getClass().getClassLoader().getResourceAsStream("marbles-uncompressed.tif")) {
        NodeChecksums checksums = checksumService.getChecksums(node, in);
        System.out.println("checksums = " + checksums);

        try (InputStream in1 = getClass().getClassLoader().getResourceAsStream("marbles-uncompressed.tif");
                ReadableByteChannel channel1 = Channels.newChannel(in1)) {
            PatchDocument patchDocument = new PatchDocumentImpl();
            patchService.updatePatchDocument(patchDocument, checksums, channel1);
            System.out.println("patchDocument = " + patchDocument);
            applyPatch(f, patchDocument);
        }
    }

    State state = new State();

    try (InputStream in3 = getClass().getClassLoader().getResourceAsStream("marbles-uncompressed.tif");
            InputStream in4 = new FileInputStream(f)) {
        assertFileEquals(in3, in4, state);
    }
}

---

From source file:org.apache.jackrabbit.oak.plugins.segment.Segment.java

/**
 * Writes this segment to the given output stream.
 *
 * @param stream stream to which this segment will be written
 * @throws IOException on an IO error//from ww  w  .  j  av a  2s .c  o m
 */
public void writeTo(OutputStream stream) throws IOException {
    ByteBuffer buffer = data.duplicate();
    WritableByteChannel channel = Channels.newChannel(stream);
    while (buffer.hasRemaining()) {
        channel.write(buffer);
    }
}

---

From source file:cn.tc.ulife.platform.msg.http.util.HttpUtil.java

/**
 * ??/*ww  w . j  av a2 s.  c o m*/
 *
 * @param is
 * @return
 * @throws IOException
 */
public static String readStreamAsStr(InputStream is) throws IOException {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    WritableByteChannel dest = Channels.newChannel(bos);
    ReadableByteChannel src = Channels.newChannel(is);
    ByteBuffer bb = ByteBuffer.allocate(4096);

    while (src.read(bb) != -1) {
        bb.flip();
        dest.write(bb);
        bb.clear();
    }
    src.close();
    dest.close();

    return new String(bos.toByteArray(), Constants.ENCODING);
}

---

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