Android Open Source - SimpleJsonAdapter Pooling Byte Array Output Stream






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Back to project page SimpleJsonAdapter.

License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2012 The Android Open Source Project
 *//  ww w  .  jav  a  2  s.  c o m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.volley.toolbox;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * A variation of {@link java.io.ByteArrayOutputStream} that uses a pool of byte[] buffers instead
 * of always allocating them fresh, saving on heap churn.
 */
public class PoolingByteArrayOutputStream extends ByteArrayOutputStream {
    /**
     * If the {@link #PoolingByteArrayOutputStream(ByteArrayPool)} constructor is called, this is
     * the default size to which the underlying byte array is initialized.
     */
    private static final int DEFAULT_SIZE = 256;

    private final ByteArrayPool mPool;

    /**
     * Constructs a new PoolingByteArrayOutputStream with a default size. If more bytes are written
     * to this instance, the underlying byte array will expand.
     */
    public PoolingByteArrayOutputStream(ByteArrayPool pool) {
        this(pool, DEFAULT_SIZE);
    }

    /**
     * Constructs a new {@code ByteArrayOutputStream} with a default size of {@code size} bytes. If
     * more than {@code size} bytes are written to this instance, the underlying byte array will
     * expand.
     *
     * @param size initial size for the underlying byte array. The value will be pinned to a default
     *        minimum size.
     */
    public PoolingByteArrayOutputStream(ByteArrayPool pool, int size) {
        mPool = pool;
        buf = mPool.getBuf(Math.max(size, DEFAULT_SIZE));
    }

    @Override
    public void close() throws IOException {
        mPool.returnBuf(buf);
        buf = null;
        super.close();
    }

    @Override
    public void finalize() {
        mPool.returnBuf(buf);
    }

    /**
     * Ensures there is enough space in the buffer for the given number of additional bytes.
     */
    private void expand(int i) {
        /* Can the buffer handle @i more bytes, if not expand it */
        if (count + i <= buf.length) {
            return;
        }
        byte[] newbuf = mPool.getBuf((count + i) * 2);
        System.arraycopy(buf, 0, newbuf, 0, count);
        mPool.returnBuf(buf);
        buf = newbuf;
    }

    @Override
    public synchronized void write(byte[] buffer, int offset, int len) {
        expand(len);
        super.write(buffer, offset, len);
    }

    @Override
    public synchronized void write(int oneByte) {
        expand(1);
        super.write(oneByte);
    }
}




Java Source Code List

com.android.volley.AuthFailureError.java
com.android.volley.CacheDispatcher.java
com.android.volley.Cache.java
com.android.volley.DefaultRetryPolicy.java
com.android.volley.ExecutorDelivery.java
com.android.volley.NetworkDispatcher.java
com.android.volley.NetworkError.java
com.android.volley.NetworkResponse.java
com.android.volley.Network.java
com.android.volley.NoConnectionError.java
com.android.volley.ParseError.java
com.android.volley.RequestQueue.java
com.android.volley.RequestTest.java
com.android.volley.Request.java
com.android.volley.ResponseDelivery.java
com.android.volley.Response.java
com.android.volley.RetryPolicy.java
com.android.volley.ServerError.java
com.android.volley.TimeoutError.java
com.android.volley.VolleyError.java
com.android.volley.VolleyLog.java
com.android.volley.mock.MockCache.java
com.android.volley.mock.MockHttpClient.java
com.android.volley.mock.MockHttpStack.java
com.android.volley.mock.MockHttpURLConnection.java
com.android.volley.mock.MockNetwork.java
com.android.volley.mock.MockRequest.java
com.android.volley.mock.MockResponseDelivery.java
com.android.volley.mock.TestRequest.java
com.android.volley.mock.WaitableQueue.java
com.android.volley.toolbox.AndroidAuthenticator.java
com.android.volley.toolbox.Authenticator.java
com.android.volley.toolbox.BasicNetwork.java
com.android.volley.toolbox.ByteArrayPool.java
com.android.volley.toolbox.ClearCacheRequest.java
com.android.volley.toolbox.DiskBasedCache.java
com.android.volley.toolbox.HttpClientStack.java
com.android.volley.toolbox.HttpHeaderParser.java
com.android.volley.toolbox.HttpStack.java
com.android.volley.toolbox.HurlStack.java
com.android.volley.toolbox.ImageLoader.java
com.android.volley.toolbox.ImageRequest.java
com.android.volley.toolbox.JsonArrayRequest.java
com.android.volley.toolbox.JsonObjectRequest.java
com.android.volley.toolbox.JsonRequest.java
com.android.volley.toolbox.NetworkImageView.java
com.android.volley.toolbox.NoCache.java
com.android.volley.toolbox.PoolingByteArrayOutputStream.java
com.android.volley.toolbox.RequestFuture.java
com.android.volley.toolbox.StringRequest.java
com.android.volley.toolbox.Volley.java
com.android.volley.utils.CacheTestUtils.java
com.android.volley.utils.ImmediateResponseDelivery.java
os.ransj.adapter.SimpleJsonAdapter.java
os.ransj.demo.AdvanceJsonAdapterDemo.java
os.ransj.demo.MainEntry.java
os.ransj.demo.SimpleJsonAdapterDemo.java