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      this License, each Contributor hereby grants to You a perpetual,
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      on behalf of whom a Contribution has been received by Licensor and
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      this License, each Contributor hereby grants to You a perpetual,
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      super(AbstractService.this.monitor);
    }

    @Override
    public boolean isSatisfied() {
      return state().compareTo(TERMINATED) >= 0;
    }
  }

  /** The listeners to notify during a state transition. */
  private final ListenerCallQueue<Listener> listeners = new ListenerCallQueue<>();

  /**
   * The current state of the service. This should be written with the lock held but can be read

	DeleteMarker            bool // Is only set in DELETE operations for delete marker replication
	CheckDMReplicationReady bool // Is delete marker ready to be replicated - set only during HEAD
	Tagging                 bool // Is only in GET/HEAD operations to return tagging metadata along with regular metadata and body.

	UserDefined         map[string]string   // only set in case of POST/PUT operations

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- [OEK](#oek): A secret and unique key used to encrypted the object, stored in an encrypted form as part of the object metadata and only loaded to RAM in plaintext during en/decrypting the object.
- [KEK](#kek): A secret and unique key used to en/decrypt the OEK and never stored anywhere. It is(re-)generated whenever en/decrypting an object using an external secret key and public parameters.