### MultiLock Synchronization Example

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

Demonstrates how to use MultiLock to synchronize access to multiple locks at once. Ensure that the locks are initialized before creating the MultiLock.

```dart
var lock1 = Lock();
var lock2 = Lock();
var multiLock = MultiLock(locks: [lock1, lock2]);

multiLock.synchronized(() async {
  // lock1 and lock2 are locked at this point
  ...
});
```

--------------------------------

### Preventing Concurrent Execution Example

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

Demonstrates how synchronized prevents interleaved execution of asynchronous tasks. Without synchronization, calls to write1234() would interleave their output; with synchronization, they execute sequentially.

```dart
Future writeSlow(int value) async {
  await Future.delayed(new Duration(milliseconds: 1));
  stdout.write(value);
}

Future write(List<int> values) async {
  for (int value in values) {
    await writeSlow(value);
  }
}

Future write1234() async {
  await write([1, 2, 3, 4]);
}

// Without synchronization:
// write1234();
// write1234();
// would print: 11223344

// With synchronization:
// lock.synchronized(write1234);
// lock.synchronized(write1234);
// would print: 12341234
```

--------------------------------

### Publish Package

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/synchronized_development.md

Command to publish the package to pub.dev.

```bash
pub publish
```

--------------------------------

### Run Quick Checks Before Committing

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/synchronized_development.md

Execute dartfmt for code formatting, dartanalyzer for static analysis, and pub run test for running unit tests before committing changes.

```bash
dartfmt -w .
dartanalyzer .
pub run test
```

--------------------------------

### Tag and Push Release

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/synchronized_development.md

After publishing, create a Git tag for the release version and push the tags to the remote repository.

```bash
git tag vX.Y.Z
git push origin --tags
```

--------------------------------

### Run Performance Tests

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/synchronized_development.md

Execute performance tests using 'pub run test' with the '-j 1' flag to limit concurrency and specify the performance test file.

```bash
pub run test -j 1 test/perf_test_.dart
```

--------------------------------

### Run Browser and Node.js Tests

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/synchronized_development.md

Run tests specifically in a Chrome browser, or execute a full test suite across Chrome, Firefox, and the Node.js virtual machine (VM).

```bash
pub run test -p chrome

# full test in one
pub run test -p chrome -p firefox -p vm
# Using build_runner
pub run build_runner test -- -p chrome -p firefox -p vm
```

--------------------------------

### Object Extension Synchronization

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/how_to.md

Import the extension to add a synchronized method to any object, allowing for instance-level synchronization without explicitly managing a Lock instance.

```dart
import 'package:synchronized/extension.dart';
```

```dart
myObject.synchronized(() async {
  // ...uninterrupted action
});
```

```dart
class MyClass {
  /// Perform a long action that won't be called more than once at a time.
  /// 
  Future performAction() {
    // Lock at the instance level
    return synchronized(() async {
      // ...uninterrupted action
    });
  }
}
```

--------------------------------

### Basic Lock Usage

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/how_to.md

Instantiate a Lock and use it to synchronize asynchronous operations. The same Lock instance must be shared across calls to ensure effective concurrency control.

```dart
var lock = new Lock();
// ...
await lock.synchronized(() async {
  // do you stuff
  // await ...
});
```

--------------------------------

### Object as a Lock (Extension)

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

Use the synchronized extension from 'package:synchronized/extension.dart' to turn any object into a lock. This allows calling synchronized() directly on an object instance.

```dart
import 'package:synchronized/extension.dart';

class MyClass {

  /// Perform a long action that won't be called more than one at a time.
  Future performAction() {
    // Lock at the instance level
    return synchronized(() async {
      // ...uninterrupted action
    });
  }
}
```

--------------------------------

### Use Git Version of Synchronized.dart

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/synchronized_development.md

Override the dependency in your pubspec.yaml to use the latest version of synchronized.dart directly from its Git repository.

```yaml
dependency_overrides:
  synchronized:
    git: https://github.com/tekartik/synchronized.dart
```

--------------------------------

### Class-Level Synchronization via Extension

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/how_to.md

Synchronize operations at the class level by calling the synchronized method on the runtime type of the class. This ensures that only one instance of the class can execute the synchronized block at a time.

```dart
class MyClass {
  /// Perform a long action that won't be called more than once at a time.
  Future performClassAction() {
    // Lock at the class level
    return runtimeType.synchronized(() async {
      // ...uninterrupted action
    });
  }
}
```

--------------------------------

### Class Instance Lock

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

Create a Lock instance within a class to protect the class's instance data and resources from concurrent modifications by different method calls on the same instance.

```dart
class MyClass {
  final _lock = new Lock();

  Future<void> myMethod() async {
    await _lock.synchronized(() async {
      step1();
      step2();
      step3();
    });
  }
}
```

--------------------------------

### Basic Lock (Default Behavior)

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

A basic lock is not reentrant by default and does not use Zone. It functions as an asynchronous executor with a pool capacity of 1.

```dart
var lock = Lock();
// ...
lock.synchronized(() async {
  // do some stuff
  // ...
});
```

--------------------------------

### Reentrant Lock Usage

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

Create a Lock with reentrant: true to allow nested synchronized calls within the same zone. This is useful when a function that acquires a lock might call another function that also needs to acquire the same lock.

```dart
var lock = new Lock(reentrant: true);
// ...
await lock.synchronized(() async {
  // do some stuff
  // ... 
  
  await lock.synchronized(() async {
    // other stuff
  }
});
```

--------------------------------

### Class-Level Synchronization

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/doc/how_to.md

Use a Lock instance within a class to ensure that methods requiring exclusive access are not called concurrently on the same object instance.

```dart
class MyClass {
  Lock _lock = new Lock();

  Future<void> myMethod() async {
    await _lock.synchronized(() async {
      step1();
      step2();
      step3();
    });
  }
}
```

--------------------------------

### Preserving Return Values

Source: https://github.com/tekartik/synchronized.dart/blob/master/synchronized/README.md

The synchronized method preserves and returns the value or error from the synchronized block.

```dart
int value = await lock.synchronized(() {
  return 1;
});
```

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