Identify and optimize object allocation in performance-critical paths by applying appropriate allocation strategies based on usage patterns. For frequently accessed objects, consider reusing instances rather than creating new ones. For short-lived objects in hot code paths, evaluate whether the JIT can optimize allocations away or if explicit object...
Identify and optimize object allocation in performance-critical paths by applying appropriate allocation strategies based on usage patterns. For frequently accessed objects, consider reusing instances rather than creating new ones. For short-lived objects in hot code paths, evaluate whether the JIT can optimize allocations away or if explicit object pooling/caching is needed.
For example, instead of creating new handler instances for each channel:
// Inefficient - creates new instance per channel
channel.pipeline().addLast(new MyHandler());
// Efficient - reuses single instance across channels
private static final MyHandler SHARED_HANDLER = new MyHandler();
// Add @Sharable annotation to handler class
channel.pipeline().addLast(SHARED_HANDLER);
For frequent operations, consider thread-local caching when appropriate:
// Cache event objects per thread for high-frequency operations
private static final ThreadLocal<MyEvent> EVENT_CACHE =
ThreadLocal.withInitial(MyEvent::new);
public void onHighFrequencyOperation() {
MyEvent event = EVENT_CACHE.get();
event.reset(); // Prepare for reuse
// Use event...
}
When dealing with buffer management, ensure proper release and consider zero-copy approaches:
ByteBuf buffer = null;
try {
buffer = allocator.directBuffer(size);
// Use buffer...
} finally {
if (buffer != null) {
buffer.release(); // Ensure proper release
}
}
For frequently used resource handles like file descriptors, consider caching and reuse:
// Instead of creating new pipes for each operation
if (pipe == null) {
pipe = FileDescriptor.pipe();
}
Measure performance impact of allocation strategies with benchmarks before committing to complex optimization patterns, as JIT may already optimize simple allocation patterns in some cases.
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