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POPersistent data structures in Java
 

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    <p>I need a persistent storage in Java for certain (possibly large) data structures, such as:</p> <ul> <li>dense and sparse matrices of integers, doubles, booleans</li> <li>directed graphs with labeled nodes and edges</li> <li>binary trees</li> <li>maps: string->string, string->integer (with fast retrieval of the keys with largest values)</li> <li>sets of integers or strings</li> </ul> <p>I don't mind if there is a separate storage for each data structure, as long as all the storages have similar, consistent interfaces.</p> <p>I need to be able to efficiently modify the data structures "remotely", that is, without fetching the entire structure to RAM, modifying it, and storing back. Example operations: put a key-value in a map, remove a node from a tree, modify a node's label in a graph, add a value to a set.</p> <p>It would be very nice if these storages could be also easily accessed from other programming languages, most notably Python. I'm thinking of a RESTful service in the backend and client APIs in Java and Python.</p> <p>Motivation: I need to process a large collection of documents and perform various analyses on them. I want to explore various approaches and create fast prototypes (for that reason I need simple, easy-to-use APIs).</p> <p>I guess I'm not the first person needing such a functionality and I would hate to reinvent the wheel here. Which brings me to the question: <strong>which open-source solutions allow easy-to-use persistence of data structures in Java?</strong></p> <p>Thanks in advance!</p>
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