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Java: Add XADD command (Stream commands) (#155)
* Add Stream XADD command to Java Signed-off-by: Andrew Carbonetto <[email protected]> --------- Signed-off-by: Andrew Carbonetto <[email protected]>
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java/client/src/main/java/glide/api/commands/StreamBaseCommands.java
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| /** Copyright GLIDE-for-Redis Project Contributors - SPDX Identifier: Apache-2.0 */ | ||
| package glide.api.commands; | ||
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| import glide.api.models.commands.StreamAddOptions; | ||
| import java.util.Map; | ||
| import java.util.concurrent.CompletableFuture; | ||
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| /** | ||
| * Supports commands and transactions for the "Stream Commands" group for standalone clients and | ||
| * cluster clients. | ||
| * | ||
| * @see <a href="https://redis.io/commands/?group=stream">Stream Commands</a> | ||
| */ | ||
| public interface StreamBaseCommands { | ||
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| /** | ||
| * Adds an entry to the specified stream. | ||
| * | ||
| * @see <a href="https://redis.io/commands/xadd/">redis.io</a> for details. | ||
| * @param key The key of the stream. | ||
| * @param values Field-value pairs to be added to the entry. | ||
| * @return The id of the added entry. | ||
| * @example | ||
| * <pre>{@code | ||
| * String streamId = client.xadd("key", Map.of("name", "Sara", "surname", "OConnor").get(); | ||
| * System.out.println("Stream: " + streamId); | ||
| * }</pre> | ||
| */ | ||
| CompletableFuture<String> xadd(String key, Map<String, String> values); | ||
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| /** | ||
| * Adds an entry to the specified stream. | ||
| * | ||
| * @see <a href="https://redis.io/commands/xadd/">redis.io</a> for details. | ||
| * @param key The key of the stream. | ||
| * @param values Field-value pairs to be added to the entry. | ||
| * @param options Stream add options. | ||
| * @return The id of the added entry, or <code>null</code> if {@link StreamAddOptions#makeStream} | ||
| * is set to <code>false</code> and no stream with the matching <code>key</code> exists. | ||
| * @example | ||
| * <pre>{@code | ||
| * // Option to use the existing stream, or return null if the stream doesn't already exist at "key" | ||
| * StreamAddOptions options = StreamAddOptions.builder().id("sid").makeStream(Boolean.FALSE).build(); | ||
| * String streamId = client.xadd("key", Map.of("name", "Sara", "surname", "OConnor"), options).get(); | ||
| * if (streamId != null) { | ||
| * assert streamId.equals("sid"); | ||
| * } | ||
| * }</pre> | ||
| */ | ||
| CompletableFuture<String> xadd(String key, Map<String, String> values, StreamAddOptions options); | ||
| } |
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java/client/src/main/java/glide/api/models/commands/StreamAddOptions.java
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| /** Copyright GLIDE-for-Redis Project Contributors - SPDX Identifier: Apache-2.0 */ | ||
| package glide.api.models.commands; | ||
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| import glide.api.commands.StreamBaseCommands; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import lombok.Builder; | ||
| import lombok.NonNull; | ||
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| /** | ||
| * Optional arguments to {@link StreamBaseCommands#xadd} | ||
| * | ||
| * @see <a href="https://redis.io/commands/xadd/">redis.io</a> | ||
| */ | ||
| @Builder | ||
| public final class StreamAddOptions { | ||
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| public static final String NO_MAKE_STREAM_REDIS_API = "NOMKSTREAM"; | ||
| public static final String ID_WILDCARD_REDIS_API = "*"; | ||
| public static final String TRIM_MAXLEN_REDIS_API = "MAXLEN"; | ||
| public static final String TRIM_MINID_REDIS_API = "MINID"; | ||
| public static final String TRIM_EXACT_REDIS_API = "="; | ||
| public static final String TRIM_NOT_EXACT_REDIS_API = "~"; | ||
| public static final String TRIM_LIMIT_REDIS_API = "LIMIT"; | ||
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| /** If set, the new entry will be added with this <code>id</code>. */ | ||
| private final String id; | ||
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| /** | ||
| * If set to <code>false</code>, a new stream won't be created if no stream matches the given key. | ||
| * <br> | ||
| * Equivalent to <code>NOMKSTREAM</code> in the Redis API. | ||
| */ | ||
| private final Boolean makeStream; | ||
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| /** If set, the add operation will also trim the older entries in the stream. */ | ||
| private final StreamTrimOptions trim; | ||
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| public abstract static class StreamTrimOptions { | ||
| /** | ||
| * If <code>true</code>, the stream will be trimmed exactly. Equivalent to <code>=</code> in the | ||
| * Redis API. Otherwise, the stream will be trimmed in a near-exact manner, which is more | ||
| * efficient, equivalent to <code>~</code> in the Redis API. | ||
| */ | ||
| protected boolean exact; | ||
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| /** If set, sets the maximal amount of entries that will be deleted. */ | ||
| protected Long limit; | ||
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| protected abstract String getMethod(); | ||
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| protected abstract String getThreshold(); | ||
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| protected List<String> getRedisApi() { | ||
| List<String> optionArgs = new ArrayList<>(); | ||
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| optionArgs.add(this.getMethod()); | ||
| optionArgs.add(this.exact ? TRIM_EXACT_REDIS_API : TRIM_NOT_EXACT_REDIS_API); | ||
| optionArgs.add(this.getThreshold()); | ||
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| if (this.limit != null) { | ||
| optionArgs.add(TRIM_LIMIT_REDIS_API); | ||
| optionArgs.add(this.limit.toString()); | ||
| } | ||
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| return optionArgs; | ||
| } | ||
| } | ||
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| /** Option to trim the stream according to minimum ID. */ | ||
| public static class MinId extends StreamTrimOptions { | ||
| /** Trim the stream according to entry ID. Equivalent to <code>MINID</code> in the Redis API. */ | ||
| private final String threshold; | ||
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| /** | ||
| * Create a trim option to trim stream based on stream ID. | ||
| * | ||
| * @param exact whether to match exactly on the threshold. | ||
| * @param threshold comparison id. | ||
| */ | ||
| public MinId(boolean exact, @NonNull String threshold) { | ||
| this.threshold = threshold; | ||
| this.exact = exact; | ||
| } | ||
|
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| /** | ||
| * Create a trim option to trim stream based on stream ID. | ||
| * | ||
| * @param exact whether to match exactly on the threshold. | ||
| * @param threshold comparison id. | ||
| * @param limit max number of stream entries to be trimmed. | ||
| */ | ||
| public MinId(boolean exact, @NonNull String threshold, long limit) { | ||
| this.threshold = threshold; | ||
| this.exact = exact; | ||
| this.limit = limit; | ||
| } | ||
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| @Override | ||
| protected String getMethod() { | ||
| return TRIM_MINID_REDIS_API; | ||
| } | ||
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| @Override | ||
| protected String getThreshold() { | ||
| return threshold; | ||
| } | ||
| } | ||
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| /** Option to trim the stream according to maximum stream length. */ | ||
| public static class MaxLen extends StreamTrimOptions { | ||
| /** | ||
| * Trim the stream according to length.<br> | ||
| * Equivalent to <code>MAXLEN</code> in the Redis API. | ||
| */ | ||
| private final Long threshold; | ||
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| /** | ||
| * Create a Max Length trim option to trim stream based on length. | ||
| * | ||
| * @param exact whether to match exactly on the threshold. | ||
| * @param threshold comparison count. | ||
| */ | ||
| public MaxLen(boolean exact, long threshold) { | ||
| this.threshold = threshold; | ||
| this.exact = exact; | ||
| } | ||
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| /** | ||
| * Create a Max Length trim option to trim stream entries exceeds the threshold. | ||
| * | ||
| * @param exact whether to match exactly on the threshold. | ||
| * @param threshold comparison count. | ||
| * @param limit max number of stream entries to be trimmed. | ||
| */ | ||
| public MaxLen(boolean exact, long threshold, long limit) { | ||
| this.threshold = threshold; | ||
| this.exact = exact; | ||
| this.limit = limit; | ||
| } | ||
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| @Override | ||
| protected String getMethod() { | ||
| return TRIM_MAXLEN_REDIS_API; | ||
| } | ||
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| @Override | ||
| protected String getThreshold() { | ||
| return threshold.toString(); | ||
| } | ||
| } | ||
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| /** | ||
| * Converts options for Xadd into a String[]. | ||
| * | ||
| * @return String[] | ||
| */ | ||
| public String[] toArgs() { | ||
| List<String> optionArgs = new ArrayList<>(); | ||
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| if (makeStream != null && !makeStream) { | ||
| optionArgs.add(NO_MAKE_STREAM_REDIS_API); | ||
| } | ||
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| if (trim != null) { | ||
| optionArgs.addAll(trim.getRedisApi()); | ||
| } | ||
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| if (id != null) { | ||
| optionArgs.add(id); | ||
| } else { | ||
| optionArgs.add(ID_WILDCARD_REDIS_API); | ||
| } | ||
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| return optionArgs.toArray(new String[0]); | ||
| } | ||
| } |
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