Android example source code file (ConnectionThread.java)

This example Android source code file (ConnectionThread.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, connectionthread, content, context, interruptedexception, os, request, requestfeeder, string, systemclock, wait_tick, wait_timeout, waiting

The ConnectionThread.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 android.net.http;

import android.content.Context;
import android.os.SystemClock;

import org.apache.http.HttpHost;

import java.lang.Thread;

/**
 * {@hide}
 */
class ConnectionThread extends Thread {

    static final int WAIT_TIMEOUT = 5000;
    static final int WAIT_TICK = 1000;

    // Performance probe
    long mCurrentThreadTime;
    long mTotalThreadTime;

    private boolean mWaiting;
    private volatile boolean mRunning = true;
    private Context mContext;
    private RequestQueue.ConnectionManager mConnectionManager;
    private RequestFeeder mRequestFeeder;

    private int mId;
    Connection mConnection;

    ConnectionThread(Context context,
                     int id,
                     RequestQueue.ConnectionManager connectionManager,
                     RequestFeeder requestFeeder) {
        super();
        mContext = context;
        setName("http" + id);
        mId = id;
        mConnectionManager = connectionManager;
        mRequestFeeder = requestFeeder;
    }

    void requestStop() {
        synchronized (mRequestFeeder) {
            mRunning = false;
            mRequestFeeder.notify();
        }
    }

    /**
     * Loop until app shutdown. Runs connections in priority
     * order.
     */
    public void run() {
        android.os.Process.setThreadPriority(
                android.os.Process.THREAD_PRIORITY_DEFAULT +
                android.os.Process.THREAD_PRIORITY_LESS_FAVORABLE);

        // these are used to get performance data. When it is not in the timing,
        // mCurrentThreadTime is 0. When it starts timing, mCurrentThreadTime is
        // first set to -1, it will be set to the current thread time when the
        // next request starts.
        mCurrentThreadTime = 0;
        mTotalThreadTime = 0;

        while (mRunning) {
            if (mCurrentThreadTime == -1) {
                mCurrentThreadTime = SystemClock.currentThreadTimeMillis();
            }

            Request request;

            /* Get a request to process */
            request = mRequestFeeder.getRequest();

            /* wait for work */
            if (request == null) {
                synchronized(mRequestFeeder) {
                    if (HttpLog.LOGV) HttpLog.v("ConnectionThread: Waiting for work");
                    mWaiting = true;
                    try {
                        mRequestFeeder.wait();
                    } catch (InterruptedException e) {
                    }
                    mWaiting = false;
                    if (mCurrentThreadTime != 0) {
                        mCurrentThreadTime = SystemClock
                                .currentThreadTimeMillis();
                    }
                }
            } else {
                if (HttpLog.LOGV) HttpLog.v("ConnectionThread: new request " +
                                            request.mHost + " " + request );

                mConnection = mConnectionManager.getConnection(mContext,
                        request.mHost);
                mConnection.processRequests(request);
                if (mConnection.getCanPersist()) {
                    if (!mConnectionManager.recycleConnection(mConnection)) {
                        mConnection.closeConnection();
                    }
                } else {
                    mConnection.closeConnection();
                }
                mConnection = null;

                if (mCurrentThreadTime > 0) {
                    long start = mCurrentThreadTime;
                    mCurrentThreadTime = SystemClock.currentThreadTimeMillis();
                    mTotalThreadTime += mCurrentThreadTime - start;
                }
            }

        }
    }

    public synchronized String toString() {
        String con = mConnection == null ? "" : mConnection.toString();
        String active = mWaiting ? "w" : "a";
        return "cid " + mId + " " + active + " "  + con;
    }

}