/**
     * Register a memory resource holder.
     *
     * @param holder The memory resource holder to register
     */
    void addMemoryHolder(MemoryHolder holder);

    /**
     * Unregister a memory resource holder.
     *
     * @param holder The memory resource holder to unregister
     */
    void removeMemoryHolder(MemoryHolder holder);

    /**
     * Request an amount of free system memory.

    final Map<Path, Holder> modelByPath = new ConcurrentHashMap<>();

    final Map<GAKey, Holder> modelByGA = new ConcurrentHashMap<>();

    public static class Holder {
        private volatile boolean set;
        private volatile Model model;

        Holder() {}

        Holder(Model model) {
            this.model = Objects.requireNonNull(model);

Copyright <YEAR> <COPYRIGHT HOLDER>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the

    }

    protected DefaultModelRepositoryHolder(DefaultModelRepositoryHolder holder) {
        this.session = holder.session;
        this.repositoryMerging = holder.repositoryMerging;
        this.pomRepositories = List.copyOf(holder.pomRepositories);
        this.externalRepositories = List.copyOf(holder.externalRepositories);
        this.repositories = List.copyOf(holder.repositories);
    }

    @Override

    ImmutableMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =
        new AbstractMapEntry<String, Integer>() {
          @Override
          public String getKey() {
            return holder.string;
          }

          @Override
          public Integer getValue() {
            return 1;

        }
    }

    @Override
    public void addMemoryHolder(MemoryHolder holder) {
        synchronized (holdersLock) {
            holders.add(holder);
        }
    }

    @Override
    public void removeMemoryHolder(MemoryHolder holder) {
        synchronized (holdersLock) {
            holders.remove(holder);
        }
    }

    @Override

                Model model = findRawModel(from, gId, aId);
                if (model != null) {
                    context.modelByGA.put(new GAKey(gId, aId), new Holder(model));
                    context.modelByPath.put(model.getPomFile(), new Holder(model));
                }
                return model;
            }

            @Override
            public Model getRawModel(Path from, Path path) {

Copyright <YEAR> <COPYRIGHT HOLDER>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the

	// +optional
	Spec LeaseSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
}

// LeaseSpec is a specification of a Lease.
type LeaseSpec struct {
	// holderIdentity contains the identity of the holder of a current lease.
	// +optional
	HolderIdentity *string `json:"holderIdentity,omitempty" protobuf:"bytes,1,opt,name=holderIdentity"`
	// leaseDurationSeconds is a duration that candidates for a lease need

     *
     * @param session The session to use to resolve the model, must not be {@code null}.
     * @param parent The parent coordinates to resolve, must not be {@code null}.
     * @param modified a holder for the updated parent, must not be {@code null}.
     * @return The source of the requested POM, never {@code null}.
     * @throws ModelResolverException If the POM could not be resolved from any configured repository.
     */