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In the MIDP Specification version 10, sound support was minimal With the release of the MIDP Specification version 20, sound support has been significantly extended A well-defined, scalable Sound API has been created for devices supporting the Mobile Information Device Profile A diverse set of applications ncluding games and media applications ill benefit from the MIDP 20 Sound API [ Team LiB ]
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14 MIDP Persistence Libraries
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The MIDP Specification provides a mechanism for MIDlets to persistently store data and retrieve it later This persistent storage mechanism, called the Record Management System (RMS), is modeled after a simple, record-oriented database This chapter introduces the key features and characteristics of the Record Management System [ Team LiB ]
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141 The Record Management System
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Conceptually, RMS provides records and record stores, as shown in Figure 141 A record store is a collection of records that is persistent across multiple invocations of a MIDlet Each record is an array of bytes Each record in a record store can be of a different length and can each store data differently For example, in Figure 141 the topmost record, Record ID 1, may contain a String followed by an int, while the second record, Record ID 5, may contain an array of short numbers
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Figure 141 Structure of a record store
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Associated with each record in a record store is a unique identifier called the recordId This identifier can be used to retrieve a record from the record store (see getRecord in Section 1423, "Manipulating Records in a Record Store") In Figure 141, "adjacent" records in the record store do not necessarily have consecutive recordIds The underlying implementation may in fact reorganize records within the store or place two consecutively placed records in "far" apart locations All that is guaranteed is that if a record is added to the record store, it will retain its recordId until deleted A recordId is assigned via a monotonically, increasing-by-one algorithm There is no provision for "wrap around" of recordIds However, since the data type for recordIds is an integer that is capable of storing a number as large as 2,147,483,647, it is highly unlikely that a given recordId will ever be reused within a record store, especially since mobile information devices usually have limited persistent storage
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MIDlets within a MIDlet suite can access one another's record stores directly; however, no locking operations are provided by the RMS Therefore, if a MIDlet suite uses multiple MIDlets or threads to access a record store, it is the developer's responsibility to coordinate these access operations with the synchronization primitives provided by the Java programming language Note that the system software of the mobile information device is responsible for maintaining the integrity of RMS record stores throughout the normal use of the platform, including reboots, battery changes, and so forth Therefore, the programmer does not have to worry about these issues
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The sharing of RMS record stores is controlled by the MIDP application model (see Section
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142 Manipulating Record Stores and Records
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Record stores have two basic types of operations: those that deal with manipulating the record store as a whole and those that deal with manipulating the records within the record store A summary of different record store and record manipulation operations is provided in the following sections
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1421 Manipulating a Record Store
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The programmer accesses record stores by name These names are case-sensitive and may contain between 1 and 32 Unicode characters The name space for record stores is a flat, non-hierarchical space[1] [1] Note: The name space of record stores is separate from that of resources (resources are accessed by calling the method javalangClassgetResourceAsStream) Thus, the name of a record store can be lexically equivalent to that of a resource, but the two are separate entities
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Within a MIDlet suite, record store names are unique In other words, MIDlets within a MIDlet suite are not allowed to create more than one record store with the same name On the other hand, no such restriction applies to different MIDlet suites: a MIDlet within one MIDlet suite is allowed to have a record store with the same name as a MIDlet in another MIDlet suite In that case, the record stores are distinct and separate A MIDlet can obtain a list of all the record stores owned by the containing MIDlet suite by calling the class static method listRecordStores of class RecordStore
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In order to access a record store, the record store must be opened first A MIDlet can open one of its record stores with the method openRecordStore that takes two parameters: a String containing the name of the record store, and a boolean indicating whether the record store should be created if it does not exist yet The method openRecordStore returns an object of type RecordStore, which provides access to the following methods that return information about the associated record store: getName: returns a String that represents the name with which this record was opened or created
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