SizedQueue.java

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package org.jruby.ext.thread;

import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyNumeric;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.Visibility;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

/**
 * The "SizedQueue" class from the 'thread' library.
 */
@JRubyClass(name = "SizedQueue", parent = "Queue")
public class SizedQueue extends Queue {
    public SizedQueue(Ruby runtime, RubyClass type) {
        super(runtime, type);
    }

    public SizedQueue(Ruby runtime, RubyClass type, int size) {
        super(runtime, type);

        this.queue = new ArrayBlockingQueue<IRubyObject>(size, false);
    }

    public static void setup(Ruby runtime) {
        RubyClass cSizedQueue = runtime.defineClass("SizedQueue", runtime.getClass("Queue"), new ObjectAllocator() {

            public IRubyObject allocate(Ruby runtime, RubyClass klass) {
                return new SizedQueue(runtime, klass);
            }
        });
        cSizedQueue.setReifiedClass(SizedQueue.class);
        cSizedQueue.defineAnnotatedMethods(SizedQueue.class);
    }

    @JRubyMethod
    @Override
    public IRubyObject clear(ThreadContext context) {
        super.clear(context);

        return this;
    }

    @JRubyMethod
    public RubyNumeric max(ThreadContext context) {
        return RubyNumeric.int2fix(context.runtime, queue.size() + queue.remainingCapacity());
    }

    @JRubyMethod(name = "max=")
    public synchronized IRubyObject max_set(ThreadContext context, IRubyObject arg) {
        BlockingQueue<IRubyObject> oldQueue = this.queue;
        initialize(context, arg);
        oldQueue.drainTo(this.queue);
        return arg;
    }

    @JRubyMethod(name = "initialize", visibility = Visibility.PRIVATE)
    public synchronized IRubyObject initialize(ThreadContext context, IRubyObject arg) {
        int new_capacity = RubyNumeric.fix2int(arg);

        if (new_capacity <= 0) {
            throw context.runtime.newArgumentError("queue size must be positive");
        }

        this.queue = new ArrayBlockingQueue<IRubyObject>(new_capacity, false);

        return this;
    }
}