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fill="currentColor" d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27C17.45,17.19,14.93,19,12,19 c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z M12,3c-4.97,0-9,4.03-9,9s4.03,9,9,9s9-4.03,9-9c0-0.46-0.04-0.92-0.1-1.36 c-0.98,1.37-2.58,2.26-4.4,2.26c-2.98,0-5.4-2.42-5.4-5.4c0-1.81,0.89-3.42,2.26-4.4C12.92,3.04,12.46,3,12,3L12,3z"></path></svg></button></div><div class="searchBox_ZlJk"></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0"><main class="container container--fluid margin-vert--lg"><div class="row mdxPageWrapper_j9I6"><div class="col col--8"><article><h1>BP-42: New Client API - list ledgers</h1><h3 class="anchor anchorWithStickyNavbar_LWe7" id="motivation">Motivation<a href="#motivation" class="hash-link" aria-label="Direct link to Motivation" title="Direct link to Motivation"></a></h3><p>The new Client API (<code>org.apache.bookkeeper.client.api.BookKeeper</code>) aims to replace obsolete BookKeeper API but some features are not implemented yet, like the functionalities provided by <code>BookKeeperAdmin</code>. |
| For example, it does not expose a method to list available ledgers, comparable to <code>BookKeeperAdmin#listLedgers()</code>.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="ledgers-listing">Ledgers listing<a href="#ledgers-listing" class="hash-link" aria-label="Direct link to Ledgers listing" title="Direct link to Ledgers listing"></a></h4><p>The goal here is to extend the Client API for listing ledgers. Moreover current method <code>BookKeeperAdmin#listLedgers()</code> does not report errors from the metadata driver; for instance, if an IOException occurs during iterator flow, the error is not visible to the caller and the iteration is stopped (e.g. hasNext will return false). However there is no intention to change this behaviour in this proposal.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="simpler-access-to-ledgermetadata">Simpler access to LedgerMetadata<a href="#simpler-access-to-ledgermetadata" class="hash-link" aria-label="Direct link to Simpler access to LedgerMetadata" title="Direct link to Simpler access to LedgerMetadata"></a></h4><p>The goal here is to streamline the access to <code>LedgerMetadata</code>, directly from BookKeeper interface.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="ledger-id-inside-ledgermetadata">Ledger id inside LedgerMetadata<a href="#ledger-id-inside-ledgermetadata" class="hash-link" aria-label="Direct link to Ledger id inside LedgerMetadata" title="Direct link to Ledger id inside LedgerMetadata"></a></h4><p>Currently there is no <code>ledgerId</code> property inside <code>LedgerMetadata</code> interface, this can be helpful in some contexts.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="public-interfaces">Public Interfaces<a href="#public-interfaces" class="hash-link" aria-label="Direct link to Public Interfaces" title="Direct link to Public Interfaces"></a></h3><p>This proposal adds new interfaces to <code>org.apache.bookkeeper.client.api</code> package, similar to <code>org.apache.bookkeeper.client.api.BookKeeper</code> methods. </p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">// new interface</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">interface LedgersIterator {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> boolean hasNext() throws IOException;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> long next() throws IOException;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// new interface</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">interface ListLedgersResult extends AutoCloseable {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> LedgersIterator iterator();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Iterable<Long> toIterable();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// new interface</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">interface ListLedgersResultBuilder extends OpBuilder<Void>{</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // empty now, maybe some filters in future</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">interface BookKeeper {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ....</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ListLedgersResultBuilder newListLedgersOp();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CompleatableFuture<LedgerMetadata> getLedgerMetadata(long ledgerId);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">interface LedgerMetadata {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ....</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> long getLedgerId();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="proposed-changes">Proposed Changes<a href="#proposed-changes" class="hash-link" aria-label="Direct link to Proposed Changes" title="Direct link to Proposed Changes"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="ledgers-listing-1">Ledgers listing<a href="#ledgers-listing-1" class="hash-link" aria-label="Direct link to Ledgers listing" title="Direct link to Ledgers listing"></a></h4><p>The implementation is pretty similar to <code>BookKeeperAdmin#listLedgers()</code> but there are few enhancements:</p><ul><li>Handle metadata driver errors, since the IOException is directly thrown up to caller, allowing user to handle network errors in a more suitable way.</li><li>Leave the possibility to restrict/filter returned ledgers in future, without API breaking changes </li><li>Dispose some resources needed to retrieve ledgers (<code>ListLedgersResult</code> extends <code>AutoCloseable</code>)) (will be empty for current implementations)</li></ul><p>The implementation will be the same used in BookKeeperAdmin, iterating over <code>LedgerRangeIterator</code>, which already handles ledgers search properly.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="simpler-access-to-ledgermetadata-1">Simpler access to LedgerMetadata<a href="#simpler-access-to-ledgermetadata-1" class="hash-link" aria-label="Direct link to Simpler access to LedgerMetadata" title="Direct link to Simpler access to LedgerMetadata"></a></h4><p>The implementation will use LedgerManager to retrieve metadata for a specified ledgerId. </p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="ledger-id-inside-ledgermetadata-1">Ledger id inside LedgerMetadata<a href="#ledger-id-inside-ledgermetadata-1" class="hash-link" aria-label="Direct link to Ledger id inside LedgerMetadata" title="Direct link to Ledger id inside LedgerMetadata"></a></h4><p>Each time a LedgerMetadata instance is created, the ledgerId is known, so it is trivial to set it in the instance.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="compatibility-deprecation-and-migration-plan">Compatibility, Deprecation, and Migration Plan<a href="#compatibility-deprecation-and-migration-plan" class="hash-link" aria-label="Direct link to Compatibility, Deprecation, and Migration Plan" title="Direct link to Compatibility, Deprecation, and Migration Plan"></a></h3><p>No impact for current API, the proposal does not aim to explicit deprecate <code>BookKeeperAdmin#listLedgers()</code> method.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="test-plan">Test Plan<a href="#test-plan" class="hash-link" aria-label="Direct link to Test Plan" title="Direct link to Test Plan"></a></h3><p>This proposal needs only new unit tests, other tests must continue pass without any changes.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="rejected-alternatives">Rejected Alternatives<a href="#rejected-alternatives" class="hash-link" aria-label="Direct link to Rejected Alternatives" title="Direct link to Rejected Alternatives"></a></h3><p>An alternative could be creates a new API similar to BookKeeperAdmin but it is better to invest enhancing <code>org.apache.bookkeeper.client.api.BookKeeper</code> API.</p></article></div><div class="col col--2"><div class="tableOfContents_bqdL thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#motivation" class="table-of-contents__link toc-highlight">Motivation</a></li><li><a href="#public-interfaces" class="table-of-contents__link toc-highlight">Public Interfaces</a></li><li><a href="#proposed-changes" class="table-of-contents__link toc-highlight">Proposed Changes</a></li><li><a href="#compatibility-deprecation-and-migration-plan" class="table-of-contents__link toc-highlight">Compatibility, Deprecation, and Migration Plan</a></li><li><a href="#test-plan" class="table-of-contents__link toc-highlight">Test Plan</a></li><li><a href="#rejected-alternatives" class="table-of-contents__link toc-highlight">Rejected Alternatives</a></li></ul></div></div></div></main></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div 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