Examples of com.google.code.hs4j.network.buffer.IoBuffer

Package com.google.code.hs4j.network.buffer

Examples of com.google.code.hs4j.network.buffer.IoBuffer

com.google.code.hs4j.network.buffer.IoBuffer
cate heap buffer by default. IoBuffer.setUseDirectBuffer(false); // A new heap buffer is returned. IoBuffer buf = IoBuffer.allocate(1024);

Wrapping existing NIO buffers and arrays

This class provides a few wrap(...) methods that wraps any NIO buffers and byte arrays.
AutoExpand

Writing variable-length data using NIO ByteBuffers is not really easy, and it is because its size is fixed. {@link IoBuffer} introducesautoExpand property. If autoExpand property is true, you never get {@link BufferOverflowException} or{@link IndexOutOfBoundsException} (except when index is negative). Itautomatically expands its capacity and limit value. For example:
```
 String greeting = messageBundle.getMessage("hello"); IoBuffer buf = IoBuffer.allocate(16); // Turn on autoExpand (it is off by default) buf.setAutoExpand(true); buf.putString(greeting, utf8encoder); 
```
The underlying {@link ByteBuffer} is reallocated by {@link IoBuffer} behindthe scene if the encoded data is larger than 16 bytes in the example above. Its capacity will double, and its limit will increase to the last position the string is written.

AutoShrink

You might also want to decrease the capacity of the buffer when most of the allocated memory area is not being used. {@link IoBuffer} providesautoShrink property to take care of this issue. If autoShrink is turned on, {@link IoBuffer} halves the capacity of thebuffer when {@link #compact()} is invoked and only 1/4 or less of the currentcapacity is being used.
You can also {@link #shrink()} method manually to shrink the capacity of thebuffer.
The underlying {@link ByteBuffer} is reallocated by {@link IoBuffer} behindthe scene, and therefore {@link #buf()} will return a different{@link ByteBuffer} instance once capacity changes. Please also note{@link #compact()} or {@link #shrink()} will not decrease the capacity if thenew capacity is less than the {@link #minimumCapacity()} of the buffer.
Derived Buffers

Derived buffers are the buffers which were created by {@link #duplicate()}, {@link #slice()}, or {@link #asReadOnlyBuffer()}. They are useful especially when you broadcast the same messages to multiple {@link IoSession}s. Please note that the buffer derived from and its derived buffers are not both auto-expandable neither auto-shrinkable. Trying to call {@link #setAutoExpand(boolean)} or {@link #setAutoShrink(boolean)} withtrue parameter will raise an {@link IllegalStateException}.

Changing Buffer Allocation Policy

{@link IoBufferAllocator} interface lets you override the default buffermanagement behavior. There are two allocators provided out-of-the-box:
- {@link SimpleBufferAllocator} (default)
- {@link CachedBufferAllocator}
You can implement your own allocator and use it by calling {@link #setAllocator(IoBufferAllocator)}.
@author The Apache MINA Project (dev@mina.apache.org) @version $Rev: 748525 $, $Date: 2009-02-27 14:45:31 +0100 (Fri, 27 Feb 2009)$

      if (message.getWriteFuture() != null) {
        message.getWriteFuture().setResult(Boolean.TRUE);
      }
      return message.getMessage();
    }
    IoBuffer writeBuffer = message.getWriteBuffer();
    // begin writing
    message.writing();
    if (useBlockingWrite) {
      return blockingWrite(selectableChannel, message, writeBuffer);
    } else {
      while (true) {
        long n = doRealWrite(selectableChannel, writeBuffer);
        if (n > 0) {
          statistics.statisticsWrite(n);
          scheduleWritenBytes.addAndGet(0 - n);
        }
        if (writeBuffer == null || !writeBuffer.hasRemaining()) {
          if (message.getWriteFuture() != null) {
            message.getWriteFuture().setResult(Boolean.TRUE);
          }
          return message.getMessage();
        } else if (n == 0) {

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        + this.operator.length() + 1 + kenLen.length() + 1
        + this.length(keyBytes) + this.keys.length + limitStr.length()
        + 1 + offsetStr.length() + 1
        + filterAllLength+1;


    IoBuffer buf = IoBuffer.allocate(capacity);
    buf.setAutoExpand(true);
    // id
    this.writeToken(buf, this.id);
    this.writeTokenSeparator(buf);
    // operator
    this.writeToken(buf, this.operator);
    this.writeTokenSeparator(buf);
    // value nums


    this.writeToken(buf, kenLen);
    this.writeTokenSeparator(buf);


    for (byte[] data : keyBytes) {
      this.writeToken(buf, data);
      this.writeTokenSeparator(buf);
    }
    // limit
    this.writeToken(buf, limitStr);
    this.writeTokenSeparator(buf);
    // offset
    this.writeToken(buf, offsetStr);


    // filter
    for(int i=0; i< flen;i++) {
      this.writeTokenSeparator(buf);
      // filter type
      this.writeToken(buf, ftype[i]);
      this.writeTokenSeparator(buf);
      // filter operator
      this.writeToken(buf, fop[i]);
      this.writeTokenSeparator(buf);
      // filter column
      this.writeToken(buf, fcol[i]);
      this.writeTokenSeparator(buf);
      // filter value
      this.writeToken(buf, fval[i]);
    }
    this.writeCommandTerminate(buf);


    buf.flip();
    this.buffer = buf;
  }

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  public void encode() {
    String valueLen = String.valueOf(this.values.length);
    int capacity = this.id.length() + 1 + OPERATOR_INSERT.length() + 1
        + this.length(this.values) + this.values.length
        + valueLen.length() + 2;
    IoBuffer buf = IoBuffer.allocate(capacity);
    buf.setAutoExpand(true);


    // id
    this.writeToken(buf, this.id);
    this.writeTokenSeparator(buf);
    // operator
    this.writeToken(buf, OPERATOR_INSERT);
    this.writeTokenSeparator(buf);
    // key nums


    this.writeToken(buf, valueLen);
    this.writeTokenSeparator(buf);
    for (int i = 0; i < this.values.length; i++) {
      this
          .writeToken(buf, this.values[i] == null ? null
              : this.values[i]);
      if (i == this.values.length - 1) {
        this.writeCommandTerminate(buf);
      } else {
        this.writeTokenSeparator(buf);
      }
    }
    buf.flip();
    this.buffer = buf;


  }

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    int capacity = this.id.length() + 1 + this.operator.length() + 1
        + this.length(this.values) + this.length(keyBytes)
        + this.values.length + 1 + this.keys.length + limitStr.length()
        + 1 + kenLen.length() + 1 + offsetStr.length() + 2;
    IoBuffer buf = IoBuffer.allocate(capacity);
    buf.setAutoExpand(true);


    // id
    this.writeToken(buf, this.id);
    this.writeTokenSeparator(buf);
    // operator
    this.writeToken(buf, this.operator);
    this.writeTokenSeparator(buf);
    // key nums
    this.writeToken(buf, kenLen);
    this.writeTokenSeparator(buf);
    for (byte[] data : keyBytes) {
      this.writeToken(buf, data);
      this.writeTokenSeparator(buf);
    }
    // limit
    this.writeToken(buf, limitStr);
    this.writeTokenSeparator(buf);
    // offset
    this.writeToken(buf, offsetStr);
    this.writeTokenSeparator(buf);
    // modify operator
    this.writeToken(buf, this.modOperation);
    this.writeTokenSeparator(buf);


    // modify values


    for (int i = 0; i < this.values.length; i++) {
      this.writeToken(buf, this.values[i]);
      if (i == this.values.length - 1) {
        this.writeCommandTerminate(buf);
      } else {
        this.writeTokenSeparator(buf);
      }
    }


    buf.flip();
    this.buffer = buf;
  }

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  }


  public void encode() {
    byte [][]fieldBytes=HSUtils.getByteArrayFromStringArray(this.fieldList, this.encoding);
    
    IoBuffer buf = IoBuffer.allocate(2 + this.id.length() + 1
        + this.db.length() + 1 + this.tableName.length() + 1
        + this.indexName.length() + 1 + this.length(fieldBytes)
        + this.fieldList.length+ this.fieldList.length);
    buf.setAutoExpand(true);


    // header
    this.writeToken(buf, OPERATOR_OPEN_INDEX);
    this.writeTokenSeparator(buf);
    // id
    this.writeToken(buf, this.id);
    this.writeTokenSeparator(buf);
    // db name
    this.writeToken(buf, this.db);
    this.writeTokenSeparator(buf);
    // tableName
    this.writeToken(buf, this.tableName);
    this.writeTokenSeparator(buf);
    // indexName
    this.writeToken(buf, this.indexName);
    this.writeTokenSeparator(buf);
    // field list
    this.writeToken(buf, join(this.fieldList));


    // filter field list
    if(filterFieldList.length != 0) {
      this.writeTokenSeparator(buf);
      this.writeToken(buf, join(this.filterFieldList));
      this.writeCommandTerminate(buf);
    }else{
      this.writeCommandTerminate(buf);


    }


    buf.flip();


    this.buffer = buf;
  }

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            if (msg == null) {
                return null;
            }
            String message = (String) msg;
            ByteBuffer buff = TextLineCodecFactory.this.charset.encode(message);
            IoBuffer resultBuffer = IoBuffer.allocate(buff.remaining() + SPLIT.remaining());
            resultBuffer.put(buff);
            resultBuffer.put(SPLIT.slice());
            resultBuffer.flip();
            return resultBuffer;
        }

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com.google.code.hs4j.command.text.InsertCommandUnitTest

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com.google.code.hs4j.network.core.impl.ByteBufferCodecFactory$ByteBufferDecoder

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Examples of com.google.code.hs4j.network.buffer.IoBuffer

Wrapping existing NIO buffers and arrays

AutoExpand

AutoShrink

Derived Buffers

Changing Buffer Allocation Policy

Related Classes of com.google.code.hs4j.network.buffer.IoBuffer