https://github.com/gfx/java-weakidentityhashmap

A standalone library for WeakIdentityHashMap to implement inside-out fields
https://github.com/gfx/java-weakidentityhashmap

Last synced: 26 days ago
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A standalone library for WeakIdentityHashMap to implement inside-out fields

• Host: GitHub
• URL: https://github.com/gfx/java-weakidentityhashmap
• Owner: gfx
• Created: 2014-05-26T23:29:56.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-07-05T07:26:13.000Z (over 10 years ago)
• Last Synced: 2023-07-26T21:57:38.331Z (over 1 year ago)
• Language: Java
• Homepage:
• Size: 324 KB
• Stars: 6
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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README

        
# WeakIdentityHashMap [![Build Status](https://travis-ci.org/gfx/Java-WeakIdentityHashMap.svg?branch=master)](https://travis-ci.org/gfx/Java-WeakIdentityHashMap) [![Coverage Status](https://coveralls.io/repos/gfx/Java-WeakIdentityHashMap/badge.png)](https://coveralls.io/r/gfx/Java-WeakIdentityHashMap)

## How To Use

In build.gradle:

```gradle

dependencies {

    compile 'com.github.gfx.util:weak-identity-hash-map:2.0.+'

}

```

In code:

```java

Activity activity = ...;

WeakIdentityHashMap foo = new WeakIdentityHashMap<>()

 // Set an activity's field.

 // If activity is gone, this value is also gone, too.

foo.put(activity, "my field");

String value = foo.get(activity); // "my field"

```

## TEST COVERAGES

```

./gradlew check jacocoTestReport

open library/build/reports/jacoco/test/html/index.html

```

## PERFORMANCE

On Xperia A / Android 4.2.2:

```java

// in an Activity's onCreate()

Map map = new WeakIdentityHashMap<>();

map.put(this, "foo");

long t0 = System.currentTimeMillis();

for (int i = 0; i < 100000; i++) {

    String a = map.get(this);

    assert a != null;

}

Log.d("XXX", "WeakIdentityHashMap0: " + (System.currentTimeMillis() - t0));

t0 = System.currentTimeMillis();

for (int i = 0; i < 200000; i++) {

    String a = map.get(this);

    assert a != null;

}

Log.d("XXX", "WeakIdentityHashMap1: " + (System.currentTimeMillis() - t0));

```

1.0.0:

```

D/XXX﹕ WeakIdentityHashMap1: 449

D/XXX﹕ WeakIdentityHashMap2: 1108

```

2.0.0:

```

D/XXX﹕ WeakIdentityHashMap1: 167

D/XXX﹕ WeakIdentityHashMap2: 290

```