/*

 * Copyright (C) 2010 Google Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above

 * copyright notice, this list of conditions and the following disclaimer

 * in the documentation and/or other materials provided with the

 * distribution.

 *     * Neither the name of Google Inc. nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/**

 * @fileoverview Provides communication interface to remote v8 profiler.

 */

/**

 * @constructor

 */

devtools.ProfilerAgent = function()

{

    RemoteProfilerAgent.didGetActiveProfilerModules = this._didGetActiveProfilerModules.bind(this);

    RemoteProfilerAgent.didGetLogLines = this._didGetLogLines.bind(this);

    /**

     * Profiler log position.

     * @type {number}

     */

    this._logPosition = 0;

    /**

     * Last requested log position.

     * @type {number}

     */

    this._lastRequestedLogPosition = -1;

    /**

     * Profiler processor instance.

     * @type {devtools.profiler.Processor}

     */

    this._profilerProcessor = new devtools.profiler.Processor();

};

/**

 * A copy of enum from include/v8.h

 * @enum {number}

 */

devtools.ProfilerAgent.ProfilerModules = {

    PROFILER_MODULE_NONE: 0,

    PROFILER_MODULE_CPU: 1,

    PROFILER_MODULE_HEAP_STATS: 1 << 1,

    PROFILER_MODULE_JS_CONSTRUCTORS: 1 << 2,

    PROFILER_MODULE_HEAP_SNAPSHOT: 1 << 16

};

/**

 * Initializes profiling state.

 */

devtools.ProfilerAgent.prototype.initializeProfiling = function()

{

    this._getNextLogLines(false);

};

/**

 * Requests the next chunk of log lines.

 * @param {boolean} immediately Do not postpone the request.

 * @private

 */

devtools.ProfilerAgent.prototype._getNextLogLines = function(immediately)

{

    if (this._lastRequestedLogPosition == this._logPosition)

        return;

    var pos = this._lastRequestedLogPosition = this._logPosition;

    if (immediately)

        RemoteProfilerAgent.getLogLines(pos);

    else

        setTimeout(function() { RemoteProfilerAgent.getLogLines(pos); }, 500);

};

/**

 * Starts profiling.

 * @param {number} modules List of modules to enable.

 */

devtools.ProfilerAgent.prototype.startProfiling = function(modules)

{

    if (modules & devtools.ProfilerAgent.ProfilerModules.PROFILER_MODULE_HEAP_SNAPSHOT) {

        InspectorBackend.takeHeapSnapshot();

        // Active modules will not change, instead, a snapshot will be logged.

        this._getNextLogLines();

    }

};

/**

 * Handles current profiler status.

 * @param {number} modules List of active (started) modules.

 */

devtools.ProfilerAgent.prototype._didGetActiveProfilerModules = function(modules)

{

};

/**

 * Handles a portion of a profiler log retrieved by getLogLines call.

 * @param {number} pos Current position in log.

 * @param {string} log A portion of profiler log.

 */

devtools.ProfilerAgent.prototype._didGetLogLines = function(pos, log)

{

    this._logPosition = pos;

    if (log.length > 0) {

        this._profilerProcessor.processLogChunk(log);

        this._getNextLogLines();

    } else {

        // Allow re-reading from the last position.

        this._lastRequestedLogPosition = this._logPosition - 1;

    }

};