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COMPARISON.md 2.86 KB

EventBus Comparison
===================

Comparison with Square's Otto
-----------------------------
Otto is another event bus library for Android; actually it's a fork of Guava's EventBus. greenrobot's EventBus and Otto share some basic semantics (register, post, unregister, ...), but there are differences which the following table summarizes:
<table>
    <tr>
        <th></th>
        <th>EventBus</th>
        <th>Otto</th>
    </tr>
    <tr>
        <th>Declare event handling methods</th>
        <td>Annotations (since 3.0, can be precompiled for best performance)</td>
        <td>Annotations</td>
    </tr>
    <tr>
        <th>Event inheritance</th>
        <td>Yes</td>
        <td>Yes</td>
    </tr>
    <tr>
        <th>Subscriber inheritance</th>
        <td>Yes</td>
        <td>No</td>
    </tr>
    <tr>
        <th>Cache most recent events</th>
        <td>Yes, sticky events</td>
        <td>No</td>
    </tr>
    <tr>
        <th>Event producers (e.g. for coding cached events)</th>
        <td>No</td>
        <td>Yes</td>
    </tr>
    <tr>
        <th>Event delivery in posting thread</th>
        <td>Yes (Default)</td>
        <td>Yes</td>
    </tr>
    <tr>
        <th>Event delivery in main thread</th>
        <td>Yes</td>
        <td>No</td>
    </tr>
    <tr>
        <th>Event delivery in background thread</th>
        <td>Yes</td>
        <td>No</td>
    </tr>
    <tr>
        <th>Asynchronous event delivery</th>
        <td>Yes</td>
        <td>No</td>
    </tr>
</table>

_**Note:** the following information is outdated, preprocessed annotations are much faster than EventBus 2.x, on which the following table is based._

Besides features, performance is another differentiator. To compare performance, we created an Android application, which is also part of this repository (EventBusPerformance). You can also run the app on your phone to benchmark different scenarios.

TODO: Update for EventBus 3 with and without index.

Benchmark results indicate that EventBus is significantly faster in almost every scenario:
<table>
    <tr>
        <th></th>
        <th>EventBus</th>
        <th>Otto</th>
    </tr>
    <tr>
        <th>Posting 1000 events, Android 2.3 emulator</th>
        <td>~70% faster</td>
        <td></td>
    </tr>
	<tr>
        <th>Posting 1000 events, S3 Android 4.0</th>
        <td>~110% faster</td>
        <td></td>
    </tr>
    <tr>
        <th>Register 1000 subscribers, Android 2.3 emulator</th>
        <td>~10% faster</td>
        <td></td>
    </tr>
    <tr>
        <th>Register 1000 subscribers, S3 Android 4.0</th>
        <td>~70% faster</td>
        <td></td>
    </tr>
    <tr>
        <th>Register subscribers cold start, Android 2.3 emulator</th>
        <td>~350% faster</td>
        <td></td>
    </tr>	
    <tr>
        <th>Register subscribers cold start, S3 Android 4.0</th>
        <td colspan="2">About the same</td>
    </tr>	
</table>

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提交于 2016-02-01 22:04 . prepping v3.0.0

EventBus Comparison

Comparison with Square's Otto

Otto is another event bus library for Android; actually it's a fork of Guava's EventBus. greenrobot's EventBus and Otto share some basic semantics (register, post, unregister, ...), but there are differences which the following table summarizes:

	EventBus	Otto
Declare event handling methods	Annotations (since 3.0, can be precompiled for best performance)	Annotations
Event inheritance	Yes	Yes
Subscriber inheritance	Yes	No
Cache most recent events	Yes, sticky events	No
Event producers (e.g. for coding cached events)	No	Yes
Event delivery in posting thread	Yes (Default)	Yes
Event delivery in main thread	Yes	No
Event delivery in background thread	Yes	No
Asynchronous event delivery	Yes	No

Note: the following information is outdated, preprocessed annotations are much faster than EventBus 2.x, on which the following table is based.

Besides features, performance is another differentiator. To compare performance, we created an Android application, which is also part of this repository (EventBusPerformance). You can also run the app on your phone to benchmark different scenarios.

TODO: Update for EventBus 3 with and without index.

Benchmark results indicate that EventBus is significantly faster in almost every scenario:

	EventBus	Otto
Posting 1000 events, Android 2.3 emulator	~70% faster
Posting 1000 events, S3 Android 4.0	~110% faster
Register 1000 subscribers, Android 2.3 emulator	~10% faster
Register 1000 subscribers, S3 Android 4.0	~70% faster
Register subscribers cold start, Android 2.3 emulator	~350% faster
Register subscribers cold start, S3 Android 4.0	About the same

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