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Until now, EJB developers have been able to sidestep the issue of handling many clients at once by hiding behind the container. In both the stateless and stateful models, the specification mandates that only one request may access a backing bean instance at any one time. Because each request is represented by an invocation within a single thread, this means that SLSB and SFSB implementation classes need not be thread-safe. From the instance s perspective, one thread at most will enter at any given time. In the case of many concurrent requests to the same SLSB, the container will route each to a unique instance (Figure 7-2). SFSB concurrent requests must be serialized by the container but blocked until the underlying instance is available (Figure 7-3). A bean provider may also optionally prohibit parallel invocations upon a particular stateful session via the use of @javax.ejb.ConcurrencyManagement (Figure 7-4). A full discussion on concurrent programming is outside the scope of this book, but we ll introduce the main points of concern as they relate to EJB. Intentionally left out of this text are formal explanations of thread visibility, deadlock, livelock, and race conditions. If these are foreign concepts, a very good primer (and much more) is Java Concurrency in Practice by Brian Goetz, et al. (Addison-Wesley; http://jcip.net/).

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If a permission is inherited, its check boxes (located in the Security tab in the Properties dialog box for an object, and in the Permission Entry dialog box for an object) are shaded. However, shaded special permissions check boxes do not indicate inherited permissions. These shaded check boxes merely indicate that a special permission exists.

Security Template Section User Rights Security Options Event Log Restricted Groups System Services Registry File System

When two or more threads share access to a mutable instance, a number of interesting scenarios present themselves. State may change unexpectedly during the course of an operation. The example of a simple increment function illustrates this well:

Effective permissions are the overall permissions that a security principal has for an object, including group membership and inheritance from parent objects.

5. User X is a member of the Sales group and the Marketing group. The Sales group has Write permission for the Accounts shared folder. The Marketing group has Full Control permission for the Accounts shared folder. User X alone has Read permis sion for the Accounts shared folder. Which of the following permissions does User X have for the Accounts shared folder a. Write permission only b. Read permission only c. Read and Write permissions only d. Full Control permission only e. All permissions

Security Policy Sections and Key Words Authorization, user rights, access controls Security controls, management of information systems, access controls, legal notices Auditing, logging Privilege use Controls, proactive management, defense Access controls, authorization Access controls, authorization

The correct answer is e. When you assign a permission to a security principal for access to an object and that security principal is a member of a group to which you assigned a different permission, the security principal s permissions are the combination of the security principal and group permissions. User X has Full Control permission through membership in the Marketing group. By definition, Full Control permission contains all of the other permissions.

int shared = 1; int increment() { int new = shared + 1; shared = new; return shared; }

It is easy to get confused when talking about security policies because the term security policy is used to mean different things in different contexts. First, there is the organization s security policy. This is a collection of statements that identify the broad security concepts that all employees must follow. These statements are recorded in a document. Second, there is the security policy that can be designed and implemented by using technical controls in a Windows Server 2003 based computer, domain, and forest. These security policies are often implemented via the use of Group Policy policies, by applying security settings using Security Configuration and Analysis, or by directly configuring security using one of many server, domain, or server application tools. In this chapter, when the words secu rity policy or security policies are used, they represent a reference to the written security policy document that belongs to the organization.

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You delegate administrative control of domains, OUs, and containers in order to provide other administrators, groups, or users with the ability to manage functions according to their needs.

Considerations for Interpreting a Security Policy and Applying Parts of It to a Baseline Security Template

Here we simply bump the value of a shared variable by 1. Unfortunately, in the case of many threads, this operation is not safe, as illustrated in Figure 7-5.

The Delegation Of Control Wizard is provided to automate and simplify the process of setting administrative permissions for a domain, OU, or container.